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GB956000A - Producing coarse-grained crystals from a solution by evaporative cooling - Google Patents

Producing coarse-grained crystals from a solution by evaporative cooling

Info

Publication number
GB956000A
GB956000A GB28222/60A GB2822260A GB956000A GB 956000 A GB956000 A GB 956000A GB 28222/60 A GB28222/60 A GB 28222/60A GB 2822260 A GB2822260 A GB 2822260A GB 956000 A GB956000 A GB 956000A
Authority
GB
United Kingdom
Prior art keywords
crystals
flow
solution
riser
pipes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB28222/60A
Inventor
Hans Domning
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wintershall AG
Original Assignee
Wintershall AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL121657D priority Critical patent/NL121657C/xx
Priority to NL258135D priority patent/NL258135A/xx
Priority to DEW25800A priority patent/DE1107200B/en
Application filed by Wintershall AG filed Critical Wintershall AG
Priority to GB28222/60A priority patent/GB956000A/en
Priority to FR842519A priority patent/FR1273101A/en
Priority to ES0262291A priority patent/ES262291A1/en
Priority to BE597726A priority patent/BE597726A/en
Priority to US74682A priority patent/US3202487A/en
Publication of GB956000A publication Critical patent/GB956000A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/30—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic using agents to prevent the granules sticking together; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0018—Evaporation of components of the mixture to be separated
    • B01D9/0022—Evaporation of components of the mixture to be separated by reducing pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0036—Crystallisation on to a bed of product crystals; Seeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/004—Fractional crystallisation; Fractionating or rectifying columns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/005—Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)

Abstract

<PICT:0956000/C1/1> Fertilizer salt comprising coarse-grained crystals containing potassium chloride (64%), sodium chloride (34%), magnesium sulphate (1.2%) and magnesium chloride (0.7%) is produced by evaporative-cooling from 93 DEG to 30 DEG C. of an aqueous solution of Sylvine, rock salt and Kieserite in ten vacuum-evaporators (I, II, III . . .) connected in series for forward-flow by pipes 5, and for backward-flow by pipes 7, the evaporators being maintained under increasing vacuum. Each evaporator has a riser-pipe 3 the top of which has a constriction 4 which produces the velocity of flow necessaryfor sorting the crystals according to size. The conical foot 6 of each riser-pipe (except the first) is connected to the preceding evaporator by pipe 7 through which the coarser crystals, which pass down the riser-pipes in the cooler stages, are passed back to the warmer stages by means of air admitted through valve 10. Thus the coarse crystals flow through the apparatus countercurrent to the forward-flowing solution, and they are discharged into vessel 2, from which the warm feed solution is drawn up into the first evaporator. The crystalline product is predominantly of sizes in the range 0.5 to 1.0 mm. The cross-sections of the riser-pipes and their constrictions are dimensioned so that the velocity of flow through the constrictions decreases from stage to stage. This results in fine crystals, formed in an earlier stage, being carried along in the solution until the velocity of flow at a particular constriction is smaller than the settling-speed of the crystals whereupon the crystals move downwards in counter-current to the ascending solution. The cooled solution is discharged from the last evaporator.
GB28222/60A 1959-06-12 1960-08-15 Producing coarse-grained crystals from a solution by evaporative cooling Expired GB956000A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL121657D NL121657C (en) 1960-08-15
NL258135D NL258135A (en) 1960-08-15
DEW25800A DE1107200B (en) 1959-06-12 1959-06-12 Process and device for the extraction of coarse-grained salts by vacuum cooling in several stages
GB28222/60A GB956000A (en) 1960-08-15 1960-08-15 Producing coarse-grained crystals from a solution by evaporative cooling
FR842519A FR1273101A (en) 1960-08-15 1960-10-28 Method and device for obtaining coarse-grained salts by vacuum cooling
ES0262291A ES262291A1 (en) 1960-08-15 1960-11-08 Producing coarse-grained crystals from a solution by evaporative cooling
BE597726A BE597726A (en) 1960-08-15 1960-12-02 Method and device for obtaining coarse-grained salts by vacuum cooling
US74682A US3202487A (en) 1960-08-15 1960-12-08 Multiple effect, gravity classification crystallization method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28222/60A GB956000A (en) 1960-08-15 1960-08-15 Producing coarse-grained crystals from a solution by evaporative cooling

Publications (1)

Publication Number Publication Date
GB956000A true GB956000A (en) 1964-04-22

Family

ID=10272247

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28222/60A Expired GB956000A (en) 1959-06-12 1960-08-15 Producing coarse-grained crystals from a solution by evaporative cooling

Country Status (4)

Country Link
BE (1) BE597726A (en)
ES (1) ES262291A1 (en)
GB (1) GB956000A (en)
NL (2) NL258135A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110755873A (en) * 2019-10-08 2020-02-07 杭州安永环保科技有限公司 Production process for continuous crystallization of liquid substance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110755873A (en) * 2019-10-08 2020-02-07 杭州安永环保科技有限公司 Production process for continuous crystallization of liquid substance

Also Published As

Publication number Publication date
NL258135A (en)
ES262291A1 (en) 1961-02-01
BE597726A (en) 1961-06-02
NL121657C (en)

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