GB680955A - Process for obtaining pure ª† isomer of benzene hexachloride - Google Patents

Process for obtaining pure ª† isomer of benzene hexachloride

Info

Publication number
GB680955A
GB680955A GB22561/50A GB2256150A GB680955A GB 680955 A GB680955 A GB 680955A GB 22561/50 A GB22561/50 A GB 22561/50A GB 2256150 A GB2256150 A GB 2256150A GB 680955 A GB680955 A GB 680955A
Authority
GB
United Kingdom
Prior art keywords
isomer
solution
benzene
isomers
benzene hexachloride
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
GB22561/50A
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.)
Solvay SA
Original Assignee
Solvay SA
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 Solvay SA filed Critical Solvay SA
Publication of GB680955A publication Critical patent/GB680955A/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/38—Separation; Purification; Stabilisation; Use of additives
    • C07C17/392—Separation; Purification; Stabilisation; Use of additives by crystallisation; Purification or separation of the crystals

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The g -isomer of benzene hexachloride is obtained in a technically pure state by selective crystallization from a solution supersaturated in a -, b - and g -isomers when there has been added thereto "d c" to a concentration of 20-50 per cent by weight, the term "d c" comprising the isomers other than a , b and g , as well as the by-products of the chlorination of benzene, especially chloro substitution products of benzene hexachloride. This addition of d c retains the a - and b -isomers in supersaturation and the amount of d c is adjusted in accordance with the amounts of a and b present. The starting material is preferably a solution enriched in g -isomer, e.g. as obtained in Specifications 655,686 or 619,677. In operation, the mother liquor from a previous crystallization cycle is diluted with a little fresh solvent and contacted with fresh benzene hexachloride at crystallization temperature until all the g -isomer is dissolved to a saturated solution thereof. A quantity of solvent equal to that added is now evaporated off, leaving the solution supersaturated in g -isomer which then crystallizes out. Before a and b appear, the solution is filtered and recycled as above. To maintain the d c concentration constant in continuous operation, a portion of the mother liquor is removed each time, evaporated to dryness and the condensed solvent returned to the solution. Examples are given of the process, using as solvents isopropyl alcohol, benzene, ethylene chlorhydrin and trichlorethylene.
GB22561/50A 1949-09-14 1950-09-13 Process for obtaining pure ª† isomer of benzene hexachloride Expired GB680955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE680955X 1949-09-14

Publications (1)

Publication Number Publication Date
GB680955A true GB680955A (en) 1952-10-15

Family

ID=3877743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22561/50A Expired GB680955A (en) 1949-09-14 1950-09-13 Process for obtaining pure ª† isomer of benzene hexachloride

Country Status (1)

Country Link
GB (1) GB680955A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827501A (en) * 1952-02-23 1958-03-18 Boehringer Sohn Ingelheim Process of producing pure technical grade gamma-hexachloro-cyclohexane
US2911446A (en) * 1953-07-07 1959-11-03 Olin Mathieson Process for the separation of gamma benzene hexachloride

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827501A (en) * 1952-02-23 1958-03-18 Boehringer Sohn Ingelheim Process of producing pure technical grade gamma-hexachloro-cyclohexane
US2911446A (en) * 1953-07-07 1959-11-03 Olin Mathieson Process for the separation of gamma benzene hexachloride

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