GB768636A - Improvements in the separation of mixtures of organic substances by fractional crystallisation - Google Patents

Improvements in the separation of mixtures of organic substances by fractional crystallisation

Info

Publication number
GB768636A
GB768636A GB12252/55A GB1225255A GB768636A GB 768636 A GB768636 A GB 768636A GB 12252/55 A GB12252/55 A GB 12252/55A GB 1225255 A GB1225255 A GB 1225255A GB 768636 A GB768636 A GB 768636A
Authority
GB
United Kingdom
Prior art keywords
separated
mixture
carbon dioxide
mixtures
pressure
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
GB12252/55A
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.)
BASF SE
Original Assignee
BASF SE
Badische Anilin and Sodafabrik 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 BASF SE, Badische Anilin and Sodafabrik AG filed Critical BASF SE
Publication of GB768636A publication Critical patent/GB768636A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • C07C29/78—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by condensation or crystallisation
    • 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
    • B01D9/0009—Crystallisation cooling by heat exchange by direct heat exchange with added cooling fluid
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/14—Purification; Separation; Use of additives by crystallisation; Purification or separation of the crystals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process for the separation of mixtures of organic liquids by fractional crystallization consists in directly cooling the mixture with liquid carbon dioxide and then separating the crystal pulp so formed. The mixture and the liquid carbon dioxide may be contained in a spiral pipe or pressure vessel and the pressure released, or the carbon dioxide can be allowed to escape from a pressure container through a jet so that it sucks in the mixture to be separated. The temperature may be lowered to -78 DEG C. when the pressure on the carbon dioxide is released. In examples (1) p-xylene is separated from a mixture of xylenes; (2) p-cymene is separated from impurities, such as m-cymene, 1, 2, 3-trimethylbenzene, p-a -dimethylstyrene and C10 hydrocarbons; (3) tertiary butyl alcohol is separated from isopropyl alcohol. Other substances mentioned are 1, 4-diethylbenzene, 1-methyl-4 ethylbenzene, p-methylstyrene, and p-a -dimethylstyrene, which may be separated from mixtures containing them.
GB12252/55A 1954-05-20 1955-04-28 Improvements in the separation of mixtures of organic substances by fractional crystallisation Expired GB768636A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB31099A DE1034633B (en) 1954-05-20 1954-05-20 Process for the decomposition of organic substance mixtures by fractional crystallization

Publications (1)

Publication Number Publication Date
GB768636A true GB768636A (en) 1957-02-20

Family

ID=6963400

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12252/55A Expired GB768636A (en) 1954-05-20 1955-04-28 Improvements in the separation of mixtures of organic substances by fractional crystallisation

Country Status (3)

Country Link
DE (1) DE1034633B (en)
FR (1) FR1123236A (en)
GB (1) GB768636A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467724A (en) * 1966-06-15 1969-09-16 Chevron Res P-xylene process
US4331826A (en) * 1980-03-17 1982-05-25 Kawasaki Jukogyo Kabushiki Kaisha Process for separating p-xylene from a hydrocarbon mixture

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL168711C (en) * 1971-07-13 1982-05-17 Zondek Klaus PROCESS FOR UNPARAFFINING LUBRICATING OILS BY FRACTIONED CRYSTALLIZATION.
US4801760A (en) * 1988-02-12 1989-01-31 Arco Chemical Company Tertiary butyl alcohol purification

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435792A (en) * 1944-09-07 1948-02-10 Standard Oil Dev Co Chemical process
GB585076A (en) * 1945-01-17 1947-01-29 Standard Oil Dev Co Process for the production of meta-xylene
BE499776A (en) * 1947-08-26

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467724A (en) * 1966-06-15 1969-09-16 Chevron Res P-xylene process
US4331826A (en) * 1980-03-17 1982-05-25 Kawasaki Jukogyo Kabushiki Kaisha Process for separating p-xylene from a hydrocarbon mixture

Also Published As

Publication number Publication date
FR1123236A (en) 1956-09-19
DE1034633B (en) 1958-07-24

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