CN106076074A - Two-stage nitration exhaust gas processing device in a kind of benzene chloride production - Google Patents
Two-stage nitration exhaust gas processing device in a kind of benzene chloride production Download PDFInfo
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- CN106076074A CN106076074A CN201610628903.3A CN201610628903A CN106076074A CN 106076074 A CN106076074 A CN 106076074A CN 201610628903 A CN201610628903 A CN 201610628903A CN 106076074 A CN106076074 A CN 106076074A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The present invention proposes two-stage nitration exhaust gas processing device in a kind of benzene chloride production, including benzene absorptive unit, hydrogen chloride absorption unit, benzene absorbing unit, spray absorption unit.Benzene Benzene Chloride two-stage nitration tail gas will be contained and pass sequentially through benzene absorptive unit, hydrogen chloride absorption unit, benzene absorbing unit, spray absorption unit, benzene and Benzene Chloride organic gas are absorbed in benzene absorptive unit and benzene absorbing unit, hydrogen chloride gas is absorbed in hydrogen chloride absorption unit and spray absorption unit, and a remaining noble gas high position is vented.The present invention makes full use of and absorbs and the feature of two unit operations of absorption, and absorption operation is applicable to the operation of big concentration of component, and treating capacity is big, and energy consumption is low, and adsorption operations can reduce the content of organics in tail gas further, makes tail gas reach discharge standard.Apparatus of the present invention overall efficiency is high and energy consumption is low, and operating cost is low, can accomplish safe and environment-friendly, nuisanceless to greatest extent.
Description
Technical field
The present invention relates to Benzene Chloride exhaust system technical field, particularly relate to two-stage nitration vent gas treatment in a kind of benzene chloride production
Device.
Background technology
Benzene Chloride is a kind of basic organic chemical industry raw material, and primary raw material is benzene and chlorine, and dried purified petroleum benzin passes through catalyst
Effect, with chlorine generation chlorination reaction in chlorinator, the acid chlorization liquid obtained after reaction anhydrates, alkali cleaning process, be dried
Rear entrance is thick, rectifying column distillation obtains finished product Benzene Chloride.Benzene chloride production is benzene chlorination under fluidized state, has chlorine in product
Change benzene and hydrogen chloride gas.Due to high temperature continuous chlorination process, the removal of reaction heat realizes by the evaporation gasification of benzene, therefore gives birth to
Mainly having hydrogen chloride gas, benzene vapor, a small amount of Benzene Chloride steam and noble gas in the tail gas become, direct discharge not only causes
The wasting of resources, and environment can be produced severe contamination.Existing technique falling liquid film circulating slot interval renews fresh absorbing liquid one for eight hours
Secondary, during reloading, in tail gas, benzene content is unstable, the highest rises to hundreds of ppm, to follow-up system in safety and energy consumption
Affect bigger.Falling liquid film tail gas enters absorption by Hydrochloric Acid system and uses washing waste water doping tap water to absorb, difficult containing acid and the water yield in water
To control, 3 absorption towers are sequentially distributed from high to low, rely on flow by gravity to enter next stage, and assimilation effect is poor, during acid concentration
Dilute instability time dense；Tail gas is directly vented after afterbody packed tower, often steams containing a large amount of HCl gases and benzene in tail gas
Vapour, by analysis, containing benzene 2000～6000ppm in the two-stage nitration tail gas of benzene chloride production, not only to environment, to employee
Health also results in very major injury, is the most all difficult to effectively be solved.
Summary of the invention
Based on technical problem present in background technology, the present invention proposes two-stage nitration vent gas treatment in a kind of benzene chloride production
Device.
Two-stage nitration exhaust gas processing device in a kind of benzene chloride production that the present invention proposes, inhales including benzene absorptive unit, hydrogen chloride
Receive unit, benzene absorbing unit, spray absorption unit, wherein:
Benzene absorptive unit includes one-level benzene absorption plant, two grades of benzene absorption plants ..., n level benzene absorption plant, and m level benzene is inhaled
Receiving apparatus is provided with m level benzene absorption tower, m level benzene circulating slot, m level benzene circulating pump, m level benzene absorption tower be equipped with m tower air inlet,
M tower gas outlet, m tower inlet and m tower liquid outlet, be provided with benzene absorbing liquid in m level benzene circulating slot, m level benzene circulating slot is provided with
M groove inlet, m groove liquid outlet, the m tower inlet of m level benzene absorption plant goes out liquid by m level benzene circulating pump and m groove
Mouth connects, and the m tower liquid outlet of m level benzene absorption plant and m groove inlet connect, the m tower gas outlet of m level benzene absorption plant
It is connected with the m+1 tower air inlet of m+1 level benzene absorption plant；Wherein: n, m are natural number, n > m >=1；
Hydrogen chloride absorption unit includes one-level hydrogen chloride absorption device, secondary chlorination hydrogen absorption plant ..., x level hydrogen chloride
Absorption plant, y level hydrogen chloride absorption device is provided with y level hydrogen chloride absorption tower, y level hydrogen chloride circulating slot, the circulation of y level hydrogen chloride
Pump, y level hydrogen chloride absorption tower is provided with y tower gas access, y tower gas outlet, y tower liquid inlet, y tower liquid discharge
Mouthful, it being provided with hydrogen chloride absorption liquid in y level hydrogen chloride circulating slot, y level hydrogen chloride circulating slot is provided with y tank liquid entrance, y tank liquor
Body exports, and the first tower gas access of one-level hydrogen chloride absorption device is connected with the n-th tower gas outlet of n level benzene absorption plant, y level
The y tower liquid inlet of hydrogen chloride absorption device is connected by y level hydrogen chloride circulating pump and the outlet of y tank liquid, y level hydrogen chloride
The y tower liquid outlet of absorption plant and y tank liquid entrance connect, the y tower gas outlet of y level hydrogen chloride absorption device with
The y+1 tower gas access of y+1 level hydrogen chloride absorption device connects；Wherein: x, y are natural number, x > y >=1；
Benzene absorbing unit includes the benzene adsorber of multiple parallel connection, is equipped with adsorbent, each benzene adsorber in each benzene adsorber
Be equipped with absorption air inlet, absorb QI KOU, the absorption air inlet of each benzene adsorber all with the xth of x level hydrogen chloride absorption device
Tower gas outlet connects；
Spray absorption unit includes the first spray column, Sprayer Circulation groove, Sprayer Circulation pump, and the first spray column is provided with first and enters
QI KOU, the first gas outlet, the first inlet, the first liquid outlet, be provided with spray liquid in Sprayer Circulation groove, Sprayer Circulation groove is provided with
Two inlets, the second liquid outlet, the first air inlet QI KOU that absorbs with each benzene adsorber respectively is connected, and the first inlet passes through
Sprayer Circulation pump and the second liquid outlet connect, and the first liquid outlet and the second inlet connect.
Preferably, m level benzene absorption tower be provided with m level benzene absorb gas-liquid separation chamber, m tower liquid outlet, m tower gas outlet all with
M level benzene absorbs gas-liquid separation chamber's conducting.
Preferably, y level hydrogen chloride absorption tower is provided with y level hydrogen chloride absorption gas-liquid separation chamber, y tower liquid outlet, y tower
Gas outlet all with the conducting of y level hydrogen chloride absorption gas-liquid separation chamber.
Preferably, Sprayer Circulation groove is provided with the second gas outlet, and the second gas outlet is connected with the first air inlet.
Preferably, the m level benzene circulating slot of m level benzene absorption plant is provided with m groove gas outlet, m groove gas outlet and m+1 level benzene
The m+1 tower air inlet of absorption plant connects, and the n-th groove gas outlet connects with the first tower gas access of one-level hydrogen chloride absorption device
Connect.
Preferably, m level benzene circulating slot connects with m+1 level benzene circulating slot and benzene absorbing liquid overflow in m+1 level benzene circulating slot
Enter m level benzene circulating slot.
Preferably, hydrogen chloride absorption unit also includes that the second spray column, the second spray column are provided with the second air inlet, second go out
QI KOU, the 3rd inlet, the 3rd liquid outlet, the second air inlet is respectively with the xTa gas outlet of x level hydrogen chloride absorption device even
Connecing, the second gas outlet absorption air inlet with each benzene adsorber respectively is connected, the 3rd liquid outlet and x level hydrogen chloride absorption device
X level hydrogen chloride circulating slot connects.
Preferably, the second spray column uses metal material packed tower, and its filler uses metal gauze corrugated plating.
Preferably, the y level hydrogen chloride circulating slot of y level hydrogen chloride absorption device is provided with y groove gas outlet, y groove gas
Outlet is connected with the y+1 tower gas access of y+1 level hydrogen chloride absorption device, and the xth groove gas of x level hydrogen chloride absorption device goes out
Mouth is connected with the second air inlet.
Preferably, y level hydrogen chloride circulating slot connects and in y+1 level hydrogen chloride circulating slot with y+1 level hydrogen chloride circulating slot
Hydrogen chloride absorption hydrorrhea flows into y level hydrogen chloride circulating slot.
Preferably, the m level benzene absorption tower of m level benzene absorption plant is provided with m level a cooling medium inlet and m level a cooling medium goes out
Mouthful.
Preferably, the y level hydrogen chloride absorption tower of y level hydrogen chloride absorption device is provided with y level b cooling medium inlet and y level b is cold
But media outlet.
Preferably, benzene absorptive unit includes one-level benzene absorption plant, two grades of benzene absorption plants and three grades of benzene absorption plants.
Preferably, hydrogen chloride absorption unit includes one-level hydrogen chloride absorption device, secondary chlorination hydrogen absorption plant and three grades
Hydrogen chloride absorption device.
The operation principle of the present invention is as follows: will contain benzene 2000～6000ppm Benzene Chloride two-stage nitration tail gas and pass sequentially through benzene absorption
Unit, hydrogen chloride absorption unit, benzene absorbing unit, spray absorption unit, benzene and Benzene Chloride organic gas at benzene absorptive unit and
Being absorbed in benzene absorbing unit, hydrogen chloride gas is absorbed in hydrogen chloride absorption unit and spray absorption unit, remaining lazy
Property a gas high position emptying.
The present invention makes full use of and absorbs and the feature of two unit operations of absorption, and absorption operation is applicable to big concentration of component behaviour
Making, treating capacity is big, and energy consumption is low, and adsorption operations can reduce the content of organics in tail gas further, makes tail gas reach discharge
Standard.Apparatus of the present invention overall efficiency is high and energy consumption is low, and operating cost is low, can accomplish safe and environment-friendly, without public to greatest extent
Evil.
Accompanying drawing explanation
Fig. 1 is two-stage nitration exhaust gas processing device structural representation in a kind of benzene chloride production that the present invention proposes.
Detailed description of the invention
As it is shown in figure 1, two-stage nitration exhaust gas processing device in a kind of benzene chloride production that Fig. 1 is the present invention to be proposed.
With reference to Fig. 1, in one embodiment, the present invention proposes two-stage nitration exhaust gas processing device in a kind of benzene chloride production, bag
Include benzene absorptive unit, hydrogen chloride absorption unit, benzene absorbing unit, spray absorption unit, wherein:
In the present embodiment, benzene absorptive unit includes that one-level benzene absorption plant, two grades of benzene absorption plants, three grades of benzene absorb dress
Put, wherein:
One-level benzene absorption plant is provided with one-level benzene absorption tower 1, one-level benzene circulating slot 2, one-level benzene circulating pump 3, and one-level benzene is inhaled
Receive tower 1 and be equipped with the first tower air inlet, the first tower gas outlet, the first tower inlet, the first tower liquid outlet, one-level a cooling medium
Import and the outlet of one-level a cooling medium, a cooling medium employing-5～-15 DEG C of chilled brines, one-level benzene absorption tower 1 uses phenolic aldehyde
Impregnated graphite material descending membrane-pipe type absorber, and one-level benzene absorption tower 1 be provided with one-level benzene absorb gas-liquid separation chamber, the first tower goes out liquid
Mouth, the first tower gas outlet all absorb gas-liquid separation chamber's conducting with one-level benzene.One-level benzene circulating slot 2 liner phenolic fiberglass reinforced plastics anticorrosion
Layer, is provided with benzene absorbing liquid in one-level benzene circulating slot 2, one-level benzene circulating slot 2 be provided with the first groove inlet, the first groove liquid outlet, the
One groove gas outlet, the first tower inlet of one-level benzene absorption plant is connected with the first groove liquid outlet by one-level benzene circulating pump 3, and one
First tower liquid outlet and the first groove inlet of level benzene absorption plant connect.
Two grades of benzene absorption plants are provided with 4, two grades of two grades of benzene absorption towers, 5, two grades of benzene circulating pumps 6 of benzene circulating slot, and two grades of benzene are inhaled
Receive tower 4 and be equipped with the second tower air inlet, the second tower gas outlet, the second tower inlet, the second tower liquid outlet, two grades of a cooling mediums
Import and two grades of a cooling medium outlets, a cooling medium employing-5～-15 DEG C of chilled brines, two grades of benzene absorption towers 4 use phenolic aldehyde
Impregnated graphite material descending membrane-pipe type absorber, and two grades of benzene absorption towers 4 are provided with two grades of benzene and absorb gas-liquid separation chamber, the second tower goes out liquid
Mouth, the second tower gas outlet all absorb gas-liquid separation chamber's conducting with two grades of benzene.Two grades of benzene circulating slot 5 liner phenolic fiberglass reinforced plastics anticorrosions
Layer, is provided with benzene absorbing liquid in two grades of benzene circulating slots 5, two grades of benzene circulating slots 5 be provided with the second groove inlet, the second groove liquid outlet, the
Two groove gas outlets, the second tower air inlet of two grades of benzene absorption plants and the first tower gas outlet of one-level benzene absorption plant, the first groove
Gas outlet connects, and the second tower inlet of two grades of benzene absorption plants is connected with the second groove liquid outlet by two grades of benzene circulating pumps 6, and two
Second tower liquid outlet and the second groove inlet of level benzene absorption plant connect.
Three grades of benzene absorption plants are provided with 7, three grades of three grades of benzene absorption towers, 8, three grades of benzene circulating pumps 9 of benzene circulating slot, and three grades of benzene are inhaled
Receive tower 7 and be equipped with the 3rd tower air inlet, the 3rd tower gas outlet, the 3rd tower inlet, the 3rd tower liquid outlet, three grades of a cooling mediums
Import and three grades of a cooling medium outlets, a cooling medium employing-5～-15 DEG C of chilled brines, three grades of benzene absorption towers 7 use phenolic aldehyde
Impregnated graphite material descending membrane-pipe type absorber, and three grades of benzene absorption towers 7 are provided with three grades of benzene and absorb gas-liquid separation chamber, the 3rd tower goes out liquid
Mouth, the 3rd tower gas outlet all absorb gas-liquid separation chamber's conducting with three grades of benzene.Three grades of benzene circulating slot 8 liner phenolic fiberglass reinforced plastics anticorrosions
Layer, is provided with benzene absorbing liquid in three grades of benzene circulating slots 8, three grades of benzene circulating slots 8 be provided with the 3rd groove inlet, the 3rd groove liquid outlet, the
Three groove gas outlets, the 3rd tower air inlet of three grades of benzene absorption plants and the second tower gas outlet of two grades of benzene absorption plants, the second groove
Gas outlet connects, and the 3rd tower inlet of three grades of benzene absorption plants is connected with the 3rd groove liquid outlet by three grades of benzene circulating pumps 9, and three
3rd tower liquid outlet and the 3rd groove inlet of level benzene absorption plant connect.
In the present embodiment, 4, three grades of benzene absorption tower, 1, two grades of one-level benzene absorption tower benzene absorption tower 7 gas-liquid two-phase uses in the same direction
Absorption pattern, 4, three grades of benzene absorption tower, 1, two grades of one-level benzene absorption tower benzene absorption tower 7 gaseous phase outlet temperature be respectively 55～65 DEG C,
30～40 DEG C, 20～25 DEG C, and three grades of benzene absorption tower 7 gaseous phase outlets are containing benzene 2～5ppm.2, the two grades of benzene circulations of one-level benzene circulating slot
5, three grades of benzene circulating slots 8 of groove are sequentially communicated, and the absorbing liquid entering three grades of benzene absorption cycle grooves 8 is containing benzene 0.03～0.1% (wt)
In substandard products Benzene Chloride, and three grades of benzene absorption cycle grooves 8 absorbing liquid containing benzene≤10% (wt) overflow enter two grades of benzene absorption cycle grooves 5,
In two grades of benzene absorption cycle grooves 5, absorbing liquid enters one-level benzene absorption cycle groove 2, one-level benzene absorption cycle containing benzene≤20% (wt) overflow
In groove 2, absorbing liquid contains benzene 36～45% (wt) extraction.
In the present embodiment, hydrogen chloride absorption unit include one-level hydrogen chloride absorption device, secondary chlorination hydrogen absorption plant, three
Level hydrogen chloride absorption device, the second spray column 19, wherein:
One-level hydrogen chloride absorption device is provided with one-level hydrogen chloride absorption tower 10, one-level hydrogen chloride circulating slot 11, one-level chlorination
Hydrogen circulating pump 12, one-level hydrogen chloride absorption tower 10 is provided with the first tower gas access, the first tower gas outlet, the first tower liquid enter
Mouth, the first tower liquid outlet, one-level b cooling medium inlet and the outlet of one-level b cooling medium, b cooling medium uses 20～30 DEG C
Recirculated water, one-level hydrogen chloride absorption tower 10 uses phenolic impregnated graphite material descending membrane-pipe type absorber, and one-level hydrogen chloride absorption
Tower 10 is provided with one-level hydrogen chloride absorption gas-liquid separation chamber, the first tower liquid outlet, the first tower gas outlet all with one-level hydrogen chloride absorption
Gas-liquid separation chamber turns on.One-level hydrogen chloride circulating slot 11 liner phenolic fiberglass reinforced plastics anticorrosive coat, sets in one-level hydrogen chloride circulating slot 11
Hydrogen chloride absorption liquid, one-level hydrogen chloride circulating slot 11 is had to be provided with the first tank liquid entrance, the first tank liquid outlet, the first groove gas
Outlet, the first tower gas access of one-level hydrogen chloride absorption device and the 3rd tower gas outlet of three grades of benzene absorption plants, the 3rd groove
Gas outlet connects, and one-level hydrogen chloride circulating pump 12 and the first tank liquor are passed through in the first tower liquid inlet of one-level hydrogen chloride absorption device
Body outlet connects, and the first tower liquid outlet of one-level hydrogen chloride absorption device and the first tank liquid entrance connect.
Secondary chlorination hydrogen absorption plant is provided with secondary chlorination hydrogen absorption tower 13, secondary chlorination hydrogen circulating slot 14, secondary chlorination
Hydrogen circulating pump 15, secondary chlorination hydrogen absorption tower 13 is provided with the second tower gas access, the second tower gas outlet, the second tower liquid enter
Mouth, the second tower liquid outlet, two grades of b cooling medium inlets and two grades of b cooling medium outlets, b cooling medium uses 20～30 DEG C
Recirculated water, the secondary chlorination hydrogen absorption tower 13 of secondary chlorination hydrogen absorption plant uses phenolic impregnated graphite material descending membrane-pipe type
Absorber, and secondary chlorination hydrogen absorption tower 13 be provided with secondary chlorination hydrogen absorb gas-liquid separation chamber, the second tower liquid outlet, the second tower go out
QI KOU all absorbs gas-liquid separation chamber's conducting with secondary chlorination hydrogen.Secondary chlorination hydrogen circulating slot 14 liner phenolic fiberglass reinforced plastics anticorrosive coat,
Be provided with hydrogen chloride absorption liquid in secondary chlorination hydrogen circulating slot 14, secondary chlorination hydrogen circulating slot 14 be provided with the second tank liquid entrance,
Two tank liquid outlets, the second groove gas outlet, the second tower gas access of secondary chlorination hydrogen absorption plant is inhaled with one-level hydrogen chloride
First tower gas outlet of receiving apparatus, the first groove gas outlet connect, the second tower liquid inlet of secondary chlorination hydrogen absorption plant
It is connected with the second tank liquid outlet by secondary chlorination hydrogen circulating pump 15, the second tower liquid outlet of secondary chlorination hydrogen absorption plant
It is connected with the second tank liquid entrance.
Three grades of hydrogen chloride absorption devices are provided with 17, the three grades of chlorinations of 16, three grades of hydrogen chloride circulating slots of three grades of hydrogen chloride absorption towers
Hydrogen circulating pump 18, three grades of hydrogen chloride absorption towers 16 are provided with the 3rd tower gas access, the 3rd tower gas outlet, the 3rd tower liquid enter
Mouth, the 3rd tower liquid outlet, three grades of b cooling medium inlets and three grades of b cooling medium outlets, b cooling medium uses 20～30 DEG C
Recirculated water, the secondary chlorination hydrogen absorption tower 13 of secondary chlorination hydrogen absorption plant uses phenolic impregnated graphite material descending membrane-pipe type
Absorber, and secondary chlorination hydrogen absorption tower 13 be provided with secondary chlorination hydrogen absorb gas-liquid separation chamber, the second tower liquid outlet, the second tower go out
QI KOU all absorbs gas-liquid separation chamber's conducting with secondary chlorination hydrogen.Three grades of hydrogen chloride circulating slot 17 liner phenolic fiberglass reinforced plastics anticorrosive coats,
Be provided with hydrogen chloride absorption liquid in three grades of hydrogen chloride circulating slots 17, three grades of hydrogen chloride circulating slots 17 be provided with the 3rd tank liquid entrance,
Three tank liquid outlets, the 3rd groove gas outlet, the 3rd tower gas access of three grades of hydrogen chloride absorption devices is inhaled with secondary chlorination hydrogen
Second tower gas outlet of receiving apparatus, the second groove gas outlet connect, the 3rd tower liquid inlet of three grades of hydrogen chloride absorption devices
It is connected with the 3rd tank liquid outlet by three grades of hydrogen chloride circulating pumps 18, the 3rd tower liquid outlet of three grades of hydrogen chloride absorption devices
It is connected with the 3rd tank liquid entrance.
Second spray column 19 is provided with the second air inlet, the second gas outlet, the 3rd inlet, the 3rd liquid outlet, the second air inlet
Mouth is connected with the 3rd tower gas outlet, the 3rd groove gas outlet of three grades of hydrogen chloride absorption devices respectively, the 3rd liquid outlet and three
Three grades of hydrogen chloride circulating slots 17 of level hydrogen chloride absorption device connect.Second spray column 19 uses common graphite material filler tower,
And its filler uses 250Y type pottery corrugated plate packing.
In the present embodiment, one-level hydrogen chloride absorption tower 10,13, three grades of secondary chlorination hydrogen absorption tower hydrogen chloride absorption tower 16 gas
Liquid biphase employing absorption pattern in the same direction, the second spray column 19 gas-liquid two-phase uses reverse absorption pattern, one-level hydrogen chloride absorption tower
10,13, three grades of secondary chlorination hydrogen absorption tower hydrogen chloride absorption tower 16 gaseous phase outlet temperature be respectively 55～65 DEG C, 30～40 DEG C,
20～25 DEG C, and the second spray column 19 gaseous phase outlet is containing benzene≤10ppm, HCl (g)≤10ppm.One-level hydrogen chloride circulating slot 11,
14, three grades of hydrogen chloride circulating slots 17 of secondary chlorination hydrogen circulating slot are sequentially communicated, and enter the absorbing liquid of the second spray column 19 for from the beginning
Water or high purity water, absorbing liquid to after in the second spray column 19, gas absorbs enter three grades of hydrogen chloride absorption circulating slots 17, and
In three grades of hydrogen chloride absorption circulating slots 17, absorbing liquid enters secondary chlorination hydrogen absorption cycle groove 14 containing acid 6～8% (wt) overflow, two grades
In hydrogen chloride absorption circulating slot 14, absorbing liquid enters one-level hydrogen chloride absorption circulating slot 11, one-level chlorine containing acid 18～20% (wt) overflow
In changing hydrogen absorption cycle groove 11, absorbing liquid is containing acid 31～33% (wt) extraction.
In the present embodiment, benzene absorbing unit includes two benzene adsorbers 20 in parallel, is equipped with suction in each benzene adsorber 20
Attached dose, benzene adsorber 20 internal adsorption agent is activated carbon fiber filler, and adsorbent reactivation temperature is maintained at 90～100 DEG C, and each benzene is inhaled
Adnexa 20 be equipped with absorption air inlet, absorb QI KOU, the absorption air inlet of each benzene adsorber 20 all with three grades of hydrogen chloride absorption
Second gas outlet of device connects.
In the present embodiment, spray absorption unit includes the first spray column 21, Sprayer Circulation groove 22, Sprayer Circulation pump 23, the
One spray column is provided with the first air inlet, the first gas outlet, the first inlet, the first liquid outlet, is provided with spray in Sprayer Circulation groove 22
Drench liquid, Sprayer Circulation groove 22 liner furan Corrosion Protection of Fiber Reinforced Plastics layer, Sprayer Circulation groove 22 be provided with the second inlet, the second liquid outlet,
Second gas outlet, the second gas outlet is connected with the first air inlet, and the absorption with each benzene adsorber 20 respectively of the first air inlet is given vent to anger
Mouth connects, and the first inlet is connected with the second liquid outlet by Sprayer Circulation pump 23, and the first liquid outlet and the second inlet connect.
First spray column 21 uses metal material packed tower, and its filler uses metal gauze corrugated plate packing.Enter the first spray column
21 absorbing liquids are 32% liquid caustic soda, and the first spray column 21 gaseous phase outlet is containing benzene≤0.5ppm, HCl (g)≤0.5ppm.
The operation principle of the present invention is as follows: will contain benzene 2000～6000ppm Benzene Chloride two-stage nitration tail gas and pass sequentially through benzene absorption
Unit, hydrogen chloride absorption unit, benzene absorbing unit, spray absorption unit, benzene and Benzene Chloride organic gas at benzene absorptive unit and
Being absorbed in benzene absorbing unit, hydrogen chloride gas is absorbed in hydrogen chloride absorption unit and spray absorption unit, remaining lazy
Property a gas high position emptying.
Benzene Chloride two-stage nitration tail gas containing benzene is sent into after one section of recirculated water and two-stage nitration chilled brine condense present invention dress
Putting absorption system, in tail gas, major part benzene is absorbed by substandard products Benzene Chloride absorbing liquid, and major part hydrogen chloride gas is by tap water or height
Pure water water absorb, obtain 31～33% (wt) by-product hydrochloric acid outside sell, then tail gas enter benzene absorber, benzene and Benzene Chloride etc. are organic
Gas and a small amount of hydrogen chloride gas are adsorbed by adsorbent, and residual gas passes through and the emptying of alkali spray column rear high-lying, and adsorbent is satisfied
Standby with rear employing hot recycling.Tail gas direct of travel is contrary with absorbing liquid direct of travel, it is ensured that fresh absorbing liquid and afterbody
Tail gas contacts, and reduces to greatest extent and needs in tail gas to remove constituent content, and fresh material enters opposite side extraction from side, it is achieved
Device continuous and stable runs, and pump forced circulation is effectively ensured gas-liquid mixed effect.Set of device can corresponding multiple stage chlorinator, operation
Elastic big, it is that industry inner exhaust gas processes one of optimal device.
Two-stage nitration exhaust gas processing device in a kind of benzene chloride production that the present invention proposes, makes full use of absorption and two lists of absorption
The feature of atom operation, absorption operation is applicable to the operation of big concentration of component, and treating capacity is big, and energy consumption is low, and adsorption operations can enter one
Step reduces the content of organics in tail gas, makes tail gas reach discharge standard.Apparatus of the present invention overall efficiency is high and energy consumption is low, runs
Low cost, can accomplish safe and environment-friendly, nuisanceless to greatest extent.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, according to technical scheme and
Inventive concept equivalent or change in addition, all should contain within protection scope of the present invention.
Claims (10)
1. two-stage nitration exhaust gas processing device in a benzene chloride production, it is characterised in that include benzene absorptive unit, hydrogen chloride absorption list
Unit, benzene absorbing unit, spray absorption unit, wherein:
Benzene absorptive unit includes one-level benzene absorption plant, two grades of benzene absorption plants ..., n level benzene absorption plant, and m level benzene absorbs dress
Having installed m level benzene absorption tower, m level benzene circulating slot, m level benzene circulating pump, m level benzene absorption tower is equipped with m tower air inlet, m tower
Gas outlet, m tower inlet and m tower liquid outlet, be provided with benzene absorbing liquid in m level benzene circulating slot, m level benzene circulating slot is provided with m
Groove inlet, m groove liquid outlet, the m tower inlet of m level benzene absorption plant is connected by m level benzene circulating pump and m groove liquid outlet
Connecing, the m tower liquid outlet of m level benzene absorption plant and m groove inlet connect, the m tower gas outlet of m level benzene absorption plant and m+
The m+1 tower air inlet of 1 grade of benzene absorption plant connects；Wherein: n, m are natural number, n > m >=1；
Hydrogen chloride absorption unit includes one-level hydrogen chloride absorption device, secondary chlorination hydrogen absorption plant ..., x level hydrogen chloride absorption
Device, y level hydrogen chloride absorption device is provided with y level hydrogen chloride absorption tower, y level hydrogen chloride circulating slot, y level hydrogen chloride circulating pump, y level
Hydrogen chloride absorption tower is provided with y tower gas access, y tower gas outlet, y tower liquid inlet, y tower liquid outlet, y level chlorine
Being provided with hydrogen chloride absorption liquid in changing hydrogen circulating slot, y level hydrogen chloride circulating slot is provided with y tank liquid entrance, the outlet of y tank liquid,
First tower gas access of one-level hydrogen chloride absorption device is connected with the n-th tower gas outlet of n level benzene absorption plant, y level hydrogen chloride
The y tower liquid inlet of absorption plant is connected by y level hydrogen chloride circulating pump and the outlet of y tank liquid, and y level hydrogen chloride absorption fills
The y tower liquid outlet put and y tank liquid entrance connect, the y tower gas outlet of y level hydrogen chloride absorption device and y+1 level
The y+1 tower gas access of hydrogen chloride absorption device connects；Wherein: x, y are natural number, x > y >=1；
Benzene absorbing unit includes the benzene adsorber of multiple parallel connection, is equipped with adsorbent in each benzene adsorber, and each benzene adsorber is all provided with
Have absorption air inlet, absorb QI KOU, the absorption air inlet of each benzene adsorber all with the xth tower gas of x level hydrogen chloride absorption device
Body outlet connects；
Spray absorption unit includes the first spray column, Sprayer Circulation groove, Sprayer Circulation pump, and the first spray column is provided with the first air inlet
Mouth, the first gas outlet, the first inlet, the first liquid outlet, be provided with spray liquid in Sprayer Circulation groove, Sprayer Circulation groove is provided with second
Inlet, the second liquid outlet, the first air inlet QI KOU that absorbs with each benzene adsorber respectively is connected, and the first inlet is by spray
Drenching circulating pump and the second liquid outlet connects, the first liquid outlet and the second inlet connect.
Two-stage nitration exhaust gas processing device in benzene chloride production the most according to claim 1, it is characterised in that m level benzene absorption tower
Being provided with m level benzene and absorb gas-liquid separation chamber, m tower liquid outlet, m tower gas outlet all absorb gas-liquid separation chamber's conducting with m level benzene.
Two-stage nitration exhaust gas processing device in benzene chloride production the most according to claim 1, it is characterised in that y level hydrogen chloride is inhaled
Receive tower and be provided with y level hydrogen chloride absorption gas-liquid separation chamber, y tower liquid outlet, y tower gas outlet all with y level hydrogen chloride absorption
Gas-liquid separation chamber turns on.
4. according to two-stage nitration exhaust gas processing device in the benzene chloride production according to any one of claim 1-3, it is characterised in that spray
Drenching circulating slot and be provided with the second gas outlet, the second gas outlet is connected with the first air inlet.
5. according to two-stage nitration exhaust gas processing device in the benzene chloride production according to any one of claim 1-3, it is characterised in that m
The m level benzene circulating slot of level benzene absorption plant is provided with the m+1 of m groove gas outlet, m groove gas outlet and m+1 level benzene absorption plant
Tower air inlet connects, and the n-th groove gas outlet is connected with the first tower gas access of one-level hydrogen chloride absorption device；Preferably, m level benzene
Circulating slot connects with m+1 level benzene circulating slot and benzene absorbing liquid overflow in m+1 level benzene circulating slot enters m level benzene circulating slot.
6. according to two-stage nitration exhaust gas processing device in the benzene chloride production according to any one of claim 1-3, it is characterised in that chlorine
Change hydrogen absorptive unit also include the second spray column, the second spray column be provided with the second air inlet, the second gas outlet, the 3rd inlet,
3rd liquid outlet, the second air inlet xTa gas outlet with x level hydrogen chloride absorption device respectively is connected, and the second gas outlet is divided
It is not connected with the absorption air inlet of each benzene adsorber, the 3rd liquid outlet and the x level hydrogen chloride circulating slot of x level hydrogen chloride absorption device
Connect.
Two-stage nitration exhaust gas processing device in benzene chloride production the most according to claim 6, it is characterised in that y level hydrogen chloride is inhaled
The y level hydrogen chloride circulating slot of receiving apparatus is provided with y groove gas outlet, y groove gas outlet and y+1 level hydrogen chloride absorption device
Y+1 tower gas access connects, and the xCao gas outlet of x level hydrogen chloride absorption device is connected with the second air inlet；Preferably, y
Level hydrogen chloride circulating slot connects with y+1 level hydrogen chloride circulating slot and hydrogen chloride absorption hydrorrhea stream in y+1 level hydrogen chloride circulating slot
Enter y level hydrogen chloride circulating slot.
8. according to two-stage nitration exhaust gas processing device in the benzene chloride production according to any one of claim 1-3, it is characterised in that m
The m level benzene absorption tower of level benzene absorption plant is provided with m level a cooling medium inlet and the outlet of m level a cooling medium.
9. according to two-stage nitration exhaust gas processing device in the benzene chloride production according to any one of claim 1-3, it is characterised in that y
The y level hydrogen chloride absorption tower of level hydrogen chloride absorption device is provided with y level b cooling medium inlet and the outlet of y level b cooling medium.
10. according to two-stage nitration exhaust gas processing device in the benzene chloride production according to any one of claim 1-3, it is characterised in that
Benzene absorptive unit includes one-level benzene absorption plant, two grades of benzene absorption plants and three grades of benzene absorption plants；Preferably, hydrogen chloride absorption
Unit includes one-level hydrogen chloride absorption device, secondary chlorination hydrogen absorption plant and three grades of hydrogen chloride absorption devices.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106237795A (en) * | 2016-08-31 | 2016-12-21 | 安徽八化工股份有限公司 | Two-stage nitration exhaust gas processing device in a kind of benzene chloride production |
| CN110237694A (en) * | 2019-03-29 | 2019-09-17 | 中国医药集团联合工程有限公司 | A kind of VOCs exhaust collection governing system |
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| CN106076074B (en) | 2018-08-28 |
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