CN105566252B - The purification process of expoxy propane - Google Patents
The purification process of expoxy propane Download PDFInfo
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Abstract
The present invention provides a kind of purification process of expoxy propane (PO), and this method is the purification process of EBHP (hydrogen peroxide ethylbenzene) method expoxy propane crude product, uses C in weight-removing column first2~C6Alkyl diol does the impurity such as extractant removing water, propionic aldehyde, acetone, methanol, and kettle liquid enters extractant recovery tower recovery extractant and is recycled to the charging of weight-removing column top, and weight-removing column top distillate removes C in lightness-removing column3~C4The impurity such as lighter hydrocarbons, most of acetaldehyde, lightness-removing column kettle liquid use C into extraction tower7‑C20Hydro carbons does the impurity such as the remaining acetaldehyde of extractant removing, methanol, water, and extraction tower bottoms enters product tower, and product tower uses C7‑C20Hydro carbons is extractant removing C5~C6Lighter hydrocarbons, tower top obtain product propylene, and product tower bottoms enters solvent stripper recovery extractant C7‑C20Hydro carbons, the commercial Application available for expoxy propane (PO) purifying.
Description
Technical field
The present invention relates to the purification process of expoxy propane, and in more detail, the invention mainly relates to EBHP (hydrogen peroxide second
Benzene) legal system expoxy propane purification process, this method is will contain oxygenatedchemicals, the propylene such as water, acetaldehyde, propionic aldehyde, methanol etc.
C3~C4The C such as lighter hydrocarbons, 2- methylpentanes5~C6The refined method of the crude propene oxide of hydrocarbon impurities, above-mentioned crude propene oxide is molten
The multiple rectifying of liquid obtains polymer grade expoxy propane qualified products with the purification process that extracting rectifying is combined.
Background technology
Expoxy propane is important organic compound raw material, is to be only second to polypropylene and the third-largest propylene class of acrylonitrile is spread out
Biology, mainly for the production of PPG, propane diols and all kinds of nonionic surfactants etc., wherein PPG is raw
Produce the important source material of polyurethane foam, insulation material, elastomer, adhesive and coating etc., all kinds of nonionic surface active agent
It is used widely in industries such as oil, chemical industry, agricultural chemicals, weaving, daily use chemicals.Polymer grade expoxy propane is strict to purity requirement, because
This can be used to prepare polyvalent alcohol after carrying out further separating-purifying processing to the expoxy propane crude product of synthesis.And ring
Ethylene Oxide generation polymerization does not require nothing more than propene oxide purity and reaches 99.9wt%, has to water, aldehyde, the non-volatile impurity content that grades yet
Strict standard.
Hydrogen peroxide ethylbenzene and propylene react obtained product in EBHP (hydrogen peroxide ethylbenzene) legal system propylene oxide process
The crude propene oxide obtained after Propylene recovery and separation product, it is still oxygen-containing containing a small amount of water, acetaldehyde, propionic aldehyde, methanol etc.
The C such as compound, propylene3~C4The C such as lighter hydrocarbons, 2- methylpentanes5~C6Hydrocarbon impurities.Require high-purity to obtain meeting polymerization
Spend expoxy propane, it is necessary to be separated off the impurity contained in expoxy propane.Because acetaldehyde and expoxy propane boiling temperature approach
And relative volatility, close to 1, expoxy propane forms reason, the methods of conventional distillation such as azeotropic mixture with 2- methylpentanes and has been difficult
Into the refined of expoxy propane.
As the purification process of expoxy propane, in US5106458, US5107002, US5133839, US5354430/1,
Have in the patents of invention such as US6500311, US8093412, US20120077996 disclosed.With regard to expoxy propane it is refined for,
C is currently mainly used7-C20The method that straight chain and side chain hydro carbons and glycols carry out extractive distillation as extractant.For example, the U.S.
The hydro carbons such as normal octane are disclosed in patent US5133839, US5354430/1 to removing contained methanol, propionic aldehyde, third in expoxy propane
The impurity such as ketone are effective；It is effective to removing the oxygenatedchemicals such as water impurity, propionic aldehyde, acetone that glycol is disclosed in US5354430/1；Inhale
Attached technology also has application on expoxy propane is refined, and US4692535 removes the polyethers impurity of macromolecular using activated carbon,
US5106458, US5107002 are using ion exchange resin removing methyl formate impurity；To reduce separation process energy consumption,
US20120077996 is by the way of glycol and the double extractant multi-stage counter current extractions of normal octane and normal octane extracting rectifying are combined
Expoxy propane is carried out to refine.
But the closed cycle in system of above method extractant hydro carbons, impurity accumulate in system, it is unfavorable for improving production
Quality.The present invention is combined using heavy constituent propane diols in system with material ethylbenzene as extractant, and crude propene oxide is carried out
Separation and purification, propane diols can effectively remove the water contained in crude propene oxide, propionic aldehyde, acetone, methanol, and ethylbenzene can first remove residual
Remaining acetaldehyde, water, methanol, remove C afterwards5~C6Hydrocarbon impurities, the logistics of product tower reactor can partly enter ethylbenzene peroxidic units conduct
Reaction raw materials, extraction tower is partly directly entered as extractant, adds outlet to impurity, the accumulation of impurity advantageously reduced
Journey energy consumption, improve product quality.
The content of the invention
It is an object of the invention to provide a kind of purification process of expoxy propane, using C2~C6Alkyl diol and C7-C20Hydro carbons
As extractant to C2~C6Alkyl diol and C7-C20Hydro carbons is as extractant to EBHP (hydrogen peroxide ethylbenzene) legal system epoxy third
Crude propene oxide in alkane method carries out the purification process that multiple rectifying is combined with extracting rectifying.Crude propene oxide mainly contains
The C such as the oxygenatedchemicals such as water, acetaldehyde, propionic aldehyde, methanol, propylene3~C4The C such as lighter hydrocarbons, 2- methylpentanes5~C6Hydrocarbon impurities.Will be upper
State impurity to efficiently separate, remove successively, while polymer grade expoxy propane qualified products are obtained, reduce extractant cost.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of purification process of expoxy propane, with extraction
Agent is taken to carry out multiple extractive distillation to crude propene oxide；It is characterized in that extractant used is extractant A and extractant B, extraction
Agent A is C2~C6At least one of alkyl diol, extractant B are C7-C20At least one of hydro carbons.
In above-mentioned technical proposal, crude propene oxide includes oxygenatedchemicals, C3~C4Lighter hydrocarbons and C5~C6Hydro carbons.
In above-mentioned technical proposal, water, acetaldehyde, propionic aldehyde, methanol and acetone, C are contained in oxygenatedchemicals3~C4Contain in lighter hydrocarbons
There are propylene, C5~C6Hydro carbons contains 2- methylpentanes.
In above-mentioned technical proposal, in terms of weight content, preferable crude propene oxide composition is：500~6000ppm's is oxygen-containing
Compound, 100~2000ppm C3~C4 lighter hydrocarbons, 100~1500ppm C5~C6 hydro carbons；Preferred crude propene oxide group
Turn into：80~2500ppm propionic aldehyde, 60~2500ppm acetaldehyde, 100~6000ppm acetone, 100~2000ppm first
Alcohol, 200~3000ppm water, 100~2000ppm C3~C4Lighter hydrocarbons, 100~2000ppm C5~C6Hydro carbons.
In above-mentioned technical proposal, the purification process comprises the following steps：
(1) crude propene oxide is fed from weight-removing column middle and lower part, and extractant A is fed from tower middle and upper part, is obtained after extracting rectifying
Weight-removing column kettle liquid, remove water, propionic aldehyde, acetone, the methanol contained in crude propene oxide；
(2) above-mentioned weight-removing column kettle liquid enters extractant recovery tower, tower reactor recovery extractant A, overhead distillate composition be containing
Water, propionic aldehyde, acetone, the heavy constituent of methanol；
(3) above-mentioned weight-removing column top distillate enters lightness-removing column, tower top partial condensation, propylene, propane and a small amount of acetaldehyde, ring
Ethylene Oxide delivers to torch in the form of fixed gas, and overhead distillate mainly contains acetaldehyde, expoxy propane；
(4) above-mentioned lightness-removing column kettle liquid enters extraction tower, and extractant B is fed from tower middle and upper part, and extracting rectifying removes thick epoxy
Remaining acetaldehyde, methanol, water in propane, contain C in tower bottoms5~C6Hydro carbons and expoxy propane；
(5) above-mentioned extraction tower bottoms is fed from product tower middle and lower part, and extractant B is fed from product tower middle and upper part, product tower
Contain C in extracting rectifying removing crude propene oxide5~C6Hydrocarbon component such as 2- methylpentanes, product overhead distillate are epoxy third
Alkane product, contain C in tower bottoms5~C6Hydrocarbon component and extractant B；
(6) the said goods tower bottoms enters solvent stripper recovery extractant B, and kettle liquid is recycled to extraction tower, product tower is made
For extractant B, solvent stripper top distillate is mainly the C containing 2- methylpentanes5~C6Hydrocarbon component, to outside system.
In above-mentioned technical proposal, it is preferable that extractant A contains the extractant A of recovery in step (2), recovery in step (1)
Extractant A first exchanged heat with crude propene oxide when being back to weight-removing column.
In above-mentioned technical proposal, it is preferable that the solvent stripper kettle liquid obtained in step (6) is recycled into extraction tower and production
Product tower is as extractant.
In above-mentioned technical proposal, extractant A is C2~C6Alkyl diol, preferably propane diols.Following table is listed without extraction
Agent and ethylene glycol, 1,2-PD, under the conditions of 1,3-PD is existing, expoxy propane is to the relative volatility of water and methanol
Situation of change is shown in Table 1：
Table 1
Extractant B is C7-C20Hydro carbons, preferably ethylbenzene.Following table is listed under the conditions of without existing for extractant and ethylbenzene,
Water, methanol, acetaldehyde and 2- methylpentanes are shown in Table 2 to the situation of change of expoxy propane relative volatility.
Table 2
The invention is particularly suited to EBHP (hydrogen peroxide ethylbenzene) legal system propylene oxide process.
The logistics of product tower reactor can partly or entirely be fed directly to ethylbenzene peroxidic units as reaction raw materials, accumulate C5~C6
Hydrocarbon impurities concentration can reduce process energy consumption.
100 tower theoretical cam curves 20~80, operating pressure are controlled in 100~300kPa, and reflux ratio is molten between 0.5~3
Agent ratio (logistics 2：Logistics 1) between 0.1~1.
200 tower theoretical cam curves 20~60, operating pressure are controlled in 100~300kPa, and reflux ratio is between 20~100.
300 tower theoretical cam curves 50~80, operating pressure control in 100~300kPa, reflux ratio between 120~250,
Solvent ratio (logistics 11：Logistics 10) between 1~6.
400 tower theoretical cam curves 20~60, operating pressure are controlled in 100~300kPa, and reflux ratio is between 1~3, solvent
Than (logistics 14：Logistics 13) between 0.1~1.
500 tower theoretical cam curves 10~50, operating pressure control in 100~200kPa, reflux ratio 100~2000 it
Between.
600 tower theoretical cam curves 10~50, operating pressure are controlled in 100~200kPa, and reflux ratio is between 5~20.
For product propylene purity more than 99.9wt%, the expoxy propane rate of recovery reaches more than 99%, total aldehyde (with propionic aldehyde+
Acetaldehyde meter) it is no more than 20mg/kg, hydrocarbon impurities are no more than the impurity content such as 5ppm, acetone, water and can be neglected.
Brief description of the drawings
Fig. 1 is the method for purifying propylene oxide flow chart of the present invention：
Wherein：100-weight-removing column, 200-lightness-removing column, 300-extraction tower, 400-product tower, 500-solvent stripper,
600-extractant recovery tower, E-101-heat exchanger.
Contain the C such as the oxygenatedchemicals such as water, acetaldehyde, propionic aldehyde, methanol, propylene3~C4The C such as lighter hydrocarbons, 2- methylpentanes5~C6
The crude propene oxide (logistics 1) of hydrocarbon impurities and the extractant propane diols (logistics 2) of recovery exchange heat, crude propene oxide after heat exchange
(logistics 4) is fed from 100 tower middle and lower parts, is fed from tower middle and upper part, water, the propionic aldehyde contained in extracting rectifying removing crude propene oxide
Deng impurity；
100 overhead distillates (logistics 5) deliver to 200 towers, 200 tower top partial condensations, propylene, propane and a small amount of acetaldehyde,
Expoxy propane is to torch in the form of fixed gas, and overhead distillate (logistics 8) mainly contains acetaldehyde, expoxy propane, to outside system；
200 tower bottoms (logistics 9) enter 300 towers, and extractant ethylbenzene (logistics 17) is fed from tower middle and upper part, and extracting rectifying takes off
Except impurity (logistics 10) such as remnants acetaldehyde, water, moved to from tower top outside system；
300 tower bottoms (logistics 11) are fed from 400 tower middle and lower parts, and extractant ethylbenzene (logistics 14) enters from 400 tower middle and upper parts
Material, 400 tower extracting rectifyings remove the C such as the 2- methylpentanes contained in crude propene oxide5~C6Hydrocarbon impurities, product tower top distillate
Liquid (logistics 12) is product propylene,；
400 tower bottoms (logistics 16) enter 500 towers recovery extractant ethylbenzene, and 500 tower bottoms are recycled into 300,400 conducts
Extractant, 500 tower tops mainly contain the C such as 2- methylpentanes5~C6Hydrocarbon impurities, to outside system,；
100 tower bottoms (logistics 6) enter 600 towers recovery extractant propane diols, 600 tower bottoms (logistics 21) (logistics 2), thing
After stream 2 exchanges heat with logistics 1, extractant is used as into 100,600 overhead distillates (logistics 7) mainly contain water, propionic aldehyde, acetone,
The impurity such as 3- methylpentanes, to outside system.
Fig. 2 is the method for purifying propylene oxide flow chart of the present invention：
Wherein：100-weight-removing column, 200-lightness-removing column, 300-extraction tower, 400-product tower, 500-solvent stripper,
600-extractant recovery tower, E-101-heat exchanger.
Unlike Fig. 1,400 tower bottoms are divided into 3 parts, and logistics I (10%) direct cycles to ethylbenzene peroxidic units
As reaction raw materials, 500 towers are removed in logistics II (30%), and 300 towers are removed in logistics III (60%), and as extractant, logistics IV is supplement
Fresh ethylbenzene, flow are identical with logistics I.
Below by embodiment, the invention will be further elaborated, but these embodiments are not anyway to this hair
Bright scope is construed as limiting.
Embodiment
【Embodiment 1】
Method flow is as shown in figure 1, contain the C such as oxygenatedchemicals, the propylene such as water, acetaldehyde, propionic aldehyde, methanol3~C4Lighter hydrocarbons,
The C such as 2- methylpentanes5~C6The crude propene oxide (logistics 1) of hydrocarbon impurities, flow 10t/h, the extractant propane diols with recovery
(logistics 2) is exchanged heat to 70 DEG C, and crude propene oxide (logistics 4) is fed from 100 tower middle and lower parts after heat exchange, the extractant after heat exchange the third two
About 150 DEG C of alcohol (logistics 3) temperature, fed from tower middle and upper part, extracting rectifying removes the water contained in crude propene oxide, propionic aldehyde, third
The impurity such as ketone, 3- methylpentanes.Crude propene oxide (logistics 1) forms and content is shown in Table 3：
Table 3
| Composition | Content, wt |
| Expoxy propane | 0.99 |
| Propionic aldehyde | 1200ppm |
| Acetaldehyde | 1000ppm |
| Acetone | 5000ppm |
| Methanol | 300ppm |
| Water | 1200ppm |
| C3~C4Lighter hydrocarbons | 600ppm |
| C5~C6Hydro carbons | 500ppm |
| Ethylbenzene | 100ppm |
100 tower theoretical cam curves 40, operating pressure 120kPa, reflux ratio 1.5, solvent ratio (logistics 2：Logistics 1) 0.25.
100 overhead distillates (logistics 5) enter 200 towers, 200 tower top partial condensations, propylene, propane and a small amount of acetaldehyde,
For expoxy propane to torch in the form of fixed gas, overhead distillate (logistics 8) mainly contains acetaldehyde, expoxy propane, to outside system,
200 tower theoretical cam curves 40, operating pressure are controlled in 200kPa, reflux ratio 80；
200 tower bottoms enter 300 towers, and extractant ethylbenzene (logistics 17) is fed from tower middle and upper part, and extracting rectifying removing is remaining
Acetaldehyde, the impurity (logistics 10) such as water, moved to from tower top outside system, 300 tower theoretical cam curves 60, operating pressure control exists
160kPa, reflux ratio 150, solvent ratio (logistics 17：Logistics 9) 5.2；
300 tower bottoms (logistics 11) are fed from 400 tower middle and lower parts, and extractant ethylbenzene (logistics 16) enters from 400 tower middle and upper parts
The hydrocarbon impurities such as material, 400 tower extracting rectifyings removing 2- methylpentanes, 2- methylpentenes, methyl cyclopentane, 1,5- hexadienes, production
Product overhead distillate (logistics 12) is product propylene, 400 tower theoretical cam curves 35, and operating pressure control is returned in 180kPa
Flow ratio 1, solvent ratio (logistics 16：Logistics 11) 0.3；
400 tower bottoms (logistics 13) enter 500 towers recovery extractant ethylbenzene, and 500 tower bottoms are recycled into 300,400 conducts
Extractant, 500 tower tops mainly contain 2- methylpentanes, 2- methylpentenes, 3- methyl hexanes, methyl cyclopentane, 1,5- hexadienes
Deng hydro carbons, to outside system, 500 tower theoretical cam curves 25, operating pressure is controlled in 140kPa, reflux ratio 1500；
100 kettle liquids (logistics 6) enter 600 towers recovery extractant propane diols, and 600 tower bottoms (logistics 2) exchange heat with logistics 1
Afterwards, extractant is used as into 100, it is miscellaneous that 600 overhead distillates (logistics 7) mainly contain water, propionic aldehyde, acetone, 3- methylpentanes etc.
Matter, to outside system, 600 tower theoretical cam curves 32, operating pressure is controlled in 120kPa, reflux ratio 15.
The oxypropylene content of logistics 15 >=99.9wt%, total aldehyde (in terms of propionic aldehyde+acetaldehyde) 5mg/kg, hydrocarbon impurities are less than
The impurity content such as 10ppm, acetone, water can be neglected, and the expoxy propane rate of recovery reaches 99.5%.
Can be with the isolated polymer grade expoxy propane of economic and convenient method from the above it can be seen that implementing the present invention
Qualified products.
【Embodiment 2】
Method flow is as shown in figure 1, contain the C such as oxygenatedchemicals, the propylene such as water, acetaldehyde, propionic aldehyde, methanol3~C4Lighter hydrocarbons,
The C such as 2- methylpentanes5~C6The crude propene oxide (logistics 1) of hydrocarbon impurities, flow 10t/h, the extractant propane diols with recovery
(logistics 2) is exchanged heat to 80 DEG C, and crude propene oxide (logistics 4) is fed from 100 tower middle and lower parts after heat exchange, the extractant after heat exchange the third two
About 160 DEG C of alcohol (logistics 3) temperature, fed from tower middle and upper part, extracting rectifying removes the water contained in crude propene oxide, propionic aldehyde, third
The impurity such as ketone, 3- methylpentanes.Crude propene oxide (logistics 1) forms and content is shown in Table 4：
Table 4
| Composition | Content, wt |
| Expoxy propane | 0.985 |
| Propionic aldehyde | 2100ppm |
| Acetaldehyde | 2100ppm |
| Acetone | 4000ppm |
| Methanol | 1200ppm |
| Water | 2500ppm |
| C3~C4Lighter hydrocarbons | 1000ppm |
| C5~C6Hydro carbons | 2000ppm |
| Ethylbenzene | 100ppm |
100 tower theoretical cam curves 65, operating pressure 180kPa, reflux ratio 1.5, solvent ratio (logistics 2：Logistics 1) 0.35.
100 overhead distillates (logistics 5) enter 200 towers, 200 tower top partial condensations, propylene, propane and a small amount of acetaldehyde,
For expoxy propane to torch in the form of fixed gas, overhead distillate (logistics 8) mainly contains acetaldehyde, expoxy propane, to outside system,
200 tower theoretical cam curves 60, operating pressure are controlled in 250kPa, reflux ratio 65；
200 tower bottoms enter 300 towers, and extractant ethylbenzene (logistics 17) is fed from tower middle and upper part, and extracting rectifying removing is remaining
Acetaldehyde, the impurity (logistics 10) such as water, moved to from tower top outside system, 300 tower theoretical cam curves 80, operating pressure control exists
250kPa, reflux ratio 160, solvent ratio (logistics 17：Logistics 9) 3；
300 tower bottoms (logistics 11) are fed from 400 tower middle and lower parts, and extractant ethylbenzene (logistics 16) enters from 400 tower middle and upper parts
The hydrocarbon impurities such as material, 400 tower extracting rectifyings removing 2- methylpentanes, 2- methylpentenes, methyl cyclopentane, 1,5- hexadienes, production
Product overhead distillate (logistics 12) is product propylene, 400 tower theoretical cam curves 50, and operating pressure control is returned in 250kPa
Flow ratio 1.5, solvent ratio (logistics 16：Logistics 11) 0.55；
400 tower bottoms (logistics 13) enter 500 towers recovery extractant ethylbenzene, and 500 tower bottoms are recycled into 300,400 conducts
Extractant, 500 tower tops mainly contain 2- methylpentanes, 2- methylpentenes, 3- methyl hexanes, methyl cyclopentane, 1,5- hexadienes
Deng hydro carbons, to outside system, 500 tower theoretical cam curves 40, operating pressure is controlled in 180kPa, reflux ratio 1200；
100 kettle liquids (logistics 6) enter 600 towers recovery extractant propane diols, and 600 tower bottoms (logistics 2) exchange heat with logistics 1
Afterwards, extractant is used as into 100, it is miscellaneous that 600 overhead distillates (logistics 7) mainly contain water, propionic aldehyde, acetone, 3- methylpentanes etc.
Matter, to outside system, 600 tower theoretical cam curves 40, operating pressure is controlled in 160kPa, reflux ratio 12.
The oxypropylene content of logistics 15 >=99.9wt%, total aldehyde (in terms of propionic aldehyde+acetaldehyde) 5mg/kg, hydrocarbon impurities are less than
The impurity content such as 10ppm, acetone, water can be neglected, and the expoxy propane rate of recovery reaches 99.5%.
Can be with the isolated polymer grade expoxy propane of economic and convenient method from the above it can be seen that implementing the present invention
Qualified products.
【Embodiment 3】
For method flow as shown in Fig. 2 400 tower bottoms are divided into 3 parts, logistics I (10%) direct cycles to ethylbenzene peroxidating
Unit is as reaction raw materials, and 500 towers are removed in logistics II (30%), and 300 towers are removed in logistics III (60%), and as extractant, logistics IV is benefit
The fresh ethylbenzene filled, flow are identical with logistics I.
Remaining embodiment is same as Example 1, and 500 towers reduce nearly 60% in observable index embodiment 1.
The oxypropylene content of logistics 15 >=99.9wt%, total aldehyde (in terms of propionic aldehyde+acetaldehyde) 5mg/kg, hydrocarbon impurities are less than
The impurity content such as 10ppm, acetone, water can be neglected, and the expoxy propane rate of recovery reaches 99.5%.
Can be with the isolated polymer grade expoxy propane of economic and convenient method from the above it can be seen that implementing the present invention
Qualified products.
【Embodiment 4】
For method flow as shown in Fig. 2 400 tower bottoms are divided into 3 parts, logistics I (10%) direct cycles to ethylbenzene peroxidating
Unit is as reaction raw materials, and 500 towers are removed in logistics II (40%), and 300 towers are removed in logistics III (50%), and as extractant, logistics IV is benefit
The fresh ethylbenzene filled, flow are identical with logistics I.
Remaining embodiment is same as Example 1, and 500 towers reduce nearly 50% in observable index embodiment 2.
The oxypropylene content of logistics 15 >=99.9wt%, total aldehyde (in terms of propionic aldehyde+acetaldehyde) 5mg/kg, hydrocarbon impurities are less than
The impurity content such as 10ppm, acetone, water can be neglected, and the expoxy propane rate of recovery reaches 99.5%.
Can be with the isolated polymer grade expoxy propane of economic and convenient method from the above it can be seen that implementing the present invention
Qualified products.
Claims (8)
1. a kind of purification process of expoxy propane, multiple extractive distillation is carried out to crude propene oxide with extractant；It is characterized in that
Extractant used is extractant A and extractant B, and extractant A is C2~C6At least one of alkyl diol, extractant B are second
Benzene, it the described method comprises the following steps：
(1) crude propene oxide is fed from weight-removing column middle and lower part, and extractant A is fed from tower middle and upper part, and de- weight is obtained after extracting rectifying
Tower bottoms, remove water, propionic aldehyde, acetone, the methanol contained in crude propene oxide；
(2) above-mentioned weight-removing column kettle liquid enters extractant recovery tower, tower reactor recovery extractant A, overhead distillate composition for it is aqueous, third
Aldehyde, acetone, the heavy constituent of methanol；
(3) above-mentioned weight-removing column top distillate enters lightness-removing column, tower top partial condensation, propylene, propane and a small amount of acetaldehyde, epoxy third
Alkane delivers to torch in the form of fixed gas, and overhead distillate mainly contains acetaldehyde, expoxy propane；
(4) above-mentioned lightness-removing column kettle liquid enters extraction tower, and extractant B is fed from tower middle and upper part, extracting rectifying removing crude propene oxide
Middle remaining acetaldehyde, methanol, water, contain C in tower bottoms5~C6Hydro carbons and expoxy propane；
(5) above-mentioned extraction tower bottoms is fed from product tower middle and lower part, and extractant B is fed from product tower middle and upper part, the extraction of product tower
Contain C in rectifying removing crude propene oxide5~C6Hydrocarbon component, product overhead distillate are product propylene, are contained in tower bottoms
There is C5~C6Hydrocarbon component and extractant B；
(6) the said goods tower bottoms enters solvent stripper recovery extractant B, and kettle liquid is recycled to extraction tower, product tower as extraction
Agent B is taken, solvent stripper top distillate is the C containing 2- methylpentanes5~C6Hydrocarbon component, to outside system.
2. the purification process of expoxy propane according to claim 1, it is characterised in that crude propene oxide includes oxygen-containing chemical combination
Thing, C3~C4Lighter hydrocarbons and C5~C6Hydro carbons.
3. the purification process of expoxy propane according to claim 2, it is characterised in that crude propene oxide in terms of weight content,
Including following components：500~6000ppm oxygenatedchemicals, 100~2000ppm C3~C4 lighter hydrocarbons, 100~1500ppm's
C5~C6 hydro carbons.
4. the purification process of expoxy propane according to claim 1, it is characterised in that crude propene oxide passes through EBHP (peroxides
Change hydrogen ethylbenzene) legal system propylene oxide process obtains.
5. the purification process of expoxy propane according to claim 1, it is characterised in that extractant A contains step in step (1)
Suddenly the extractant A reclaimed in (2), first exchanged heat when the extractant A of recovery is back to weight-removing column with crude propene oxide.
6. the purification process of expoxy propane according to claim 1, it is characterised in that the solvent stripping obtained in step (6)
Tower bottoms is recycled into extraction tower and product tower as extractant.
7. the purification process of the expoxy propane according to any one of claim 1~6, it is characterised in that extractant A is the third two
Alcohol.
8. the purification process of the expoxy propane according to any one of claim 1~6, it is characterised in that product tower reactor logistics can
Part enters ethylbenzene peroxidic units as reaction raw materials, is partly directly entered extraction tower as extractant.
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| CN112209903B (en) * | 2019-07-09 | 2022-12-09 | 北京诺维新材科技有限公司 | Purification method of propylene oxide |
| CN112694455B (en) * | 2019-10-23 | 2023-08-08 | 中国石油化工股份有限公司 | System and method for hydrogenation removal of aldehydes and ketones |
| CN112694454B (en) * | 2019-10-23 | 2023-04-07 | 中国石油化工股份有限公司 | Method and system for processing crude propylene oxide material |
| CN111205248A (en) * | 2019-12-02 | 2020-05-29 | 万华化学集团股份有限公司 | Deacidifying method in propylene oxide refining process |
| CN115991684A (en) * | 2021-10-19 | 2023-04-21 | 中国石油化工股份有限公司 | Purification method and system for epoxy compound material flow |
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