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BR9714138A - Process for suspension crystallization. - Google Patents

Process for suspension crystallization.

Info

Publication number
BR9714138A
BR9714138A BR9714138-0A BR9714138A BR9714138A BR 9714138 A BR9714138 A BR 9714138A BR 9714138 A BR9714138 A BR 9714138A BR 9714138 A BR9714138 A BR 9714138A
Authority
BR
Brazil
Prior art keywords
crystallization
stage
final
suspension
crystal paste
Prior art date
Application number
BR9714138-0A
Other languages
Portuguese (pt)
Inventor
Ruediger Dr Drope
Dieter Dr Grenner
Hartmut Dr Hetzel
Hans-Peter Dr Schal
Gerhard Dr Wegener
Original Assignee
Bayer 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
Application filed by Bayer Ag filed Critical Bayer Ag
Publication of BR9714138A publication Critical patent/BR9714138A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C263/00—Preparation of derivatives of isocyanic acid
    • C07C263/18—Separation; Purification; Stabilisation; Use of additives
    • C07C263/20—Separation; Purification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
    • 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
    • B01D9/004—Fractional crystallisation; Fractionating or rectifying columns
    • B01D9/0045—Washing of crystals, e.g. in wash columns
    • 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)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Patente de Invenção: <B>"PROCESSO PARA A CRISTALIZAçãO POR SUSPENSãO"<D>. A invenção refere-se a um método de separação de compostos orgânicos por meio de cristalização por suspensão em uma ou em várias etapas, sendo que cada etapa constitui-se de um cristalizador, eventualmente um recipiente de cristalização, e de um filtro (7) para separar a fase líquida da pasta de cristais. A fase líquida (8) separada no filtro (7) é reconduzida para a respectiva etapa de cristalização e a pasta de cristais (9, 11) é aduzida para a etapa subseq³ente ou é retirada da etapa final para a coluna de lavagem (20) para a separação completa da lixívia-mãe, o líquido empobrecido de isómero a ser cristalizado (21) sendo canalizado da etapa respectiva e a mistura de composto de partida (6a, 6b) sendo passada atrás da etapa de cristalização final. O método é caracterizado pelo fato de que pelo menos um pouco da lixívia-mãe da pasta de cristal extraída da etapa de cristalização final é gradualmente trocada pela mistura do composto de partida.Invention Patent: <B> "PROCESS FOR SUSPENSION CRYSTALLIZATION" <D>. The invention relates to a method of separating organic compounds by means of crystallization by suspension in one or in several stages, each stage constituting a crystallizer, possibly a crystallization vessel, and a filter (7) to separate the liquid phase from the crystal paste. The liquid phase (8) separated in the filter (7) is returned to the respective crystallization stage and the crystal paste (9, 11) is added to the subsequent stage or removed from the final stage to the washing column (20) for the complete separation of the mother liquor, the isomer-depleted liquid to be crystallized (21) being channeled from the respective step and the starting compound mixture (6a, 6b) being passed behind the final crystallization step. The method is characterized by the fact that at least some of the mother liquor from the crystal paste extracted from the final crystallization step is gradually replaced by the mixture of the starting compound.

BR9714138-0A 1996-12-10 1997-11-27 Process for suspension crystallization. BR9714138A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19651215A DE19651215C1 (en) 1996-12-10 1996-12-10 Process for the separation of crystallizable isomer mixtures of organic compounds
PCT/EP1997/006611 WO1998025680A1 (en) 1996-12-10 1997-11-27 Suspension crystallization method

Publications (1)

Publication Number Publication Date
BR9714138A true BR9714138A (en) 2000-02-29

Family

ID=7814190

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9714138-0A BR9714138A (en) 1996-12-10 1997-11-27 Process for suspension crystallization.

Country Status (7)

Country Link
EP (1) EP0944418A1 (en)
JP (1) JP2001506539A (en)
AU (1) AU5655798A (en)
BR (1) BR9714138A (en)
DE (1) DE19651215C1 (en)
TW (1) TW386987B (en)
WO (1) WO1998025680A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2573649T3 (en) 2008-10-06 2016-06-09 Huntsman International Llc Procedure for the simultaneous production of different mixtures of diisocyanate isomers of the diphenylmethane series
EP2398767B1 (en) * 2009-02-23 2015-05-13 GEA Niro PT B.V. Process for crystallizing and separating different diisocyanate isomers
CN109970604B (en) * 2019-04-25 2021-03-19 青岛科技大学 Process for purifying 2, 4-toluene diisocyanate
CN112321560A (en) * 2020-09-18 2021-02-05 江苏科富恺机械设备有限公司 Method and system for continuously purifying L-lactide by suspension crystallization

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777892A (en) * 1971-01-27 1973-12-11 H Thijssen Apparatus for the separation and treatment of solid particles from a liquid suspension
US3872009A (en) * 1971-06-25 1975-03-18 Henricus Alexis Corne Thijssen Apparatus for the separation and treatment of solid particles from a liquid suspension
US4314368A (en) * 1978-10-12 1982-02-02 Decoursey Calvin H Receiver for pulse code multiplexed signals
US4781899A (en) * 1984-07-27 1988-11-01 Intermountain Research & Development Corporation Purification of crystallized solids made via continuous crystallization
DE3703646C2 (en) * 1987-02-06 1995-02-09 Krupp Koppers Gmbh Process for the production of p-xylene with a purity of at least 99.5%
US4787985A (en) * 1987-08-25 1988-11-29 Grenco Process Technology B.V. Multi-stage purification unit process
DE69513799T2 (en) * 1995-03-07 2000-07-06 Waterworks International, Inc. Freezing thickening method and device

Also Published As

Publication number Publication date
AU5655798A (en) 1998-07-03
WO1998025680A1 (en) 1998-06-18
JP2001506539A (en) 2001-05-22
TW386987B (en) 2000-04-11
EP0944418A1 (en) 1999-09-29
DE19651215C1 (en) 1998-07-09

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Legal Events

Date Code Title Description
FA10 Dismissal: dismissal - article 33 of industrial property law
B11Y Definitive dismissal acc. article 33 of ipl - extension of time limit for request of examination expired