GB1357053A - Process for separating dioxin from dioxin-contaminated2,4,5- trichlorophenoxyacetic acid - Google Patents

Process for separating dioxin from dioxin-contaminated2,4,5- trichlorophenoxyacetic acid

Info

Publication number
GB1357053A
GB1357053A GB4929572A GB4929572A GB1357053A GB 1357053 A GB1357053 A GB 1357053A GB 4929572 A GB4929572 A GB 4929572A GB 4929572 A GB4929572 A GB 4929572A GB 1357053 A GB1357053 A GB 1357053A
Authority
GB
United Kingdom
Prior art keywords
polar
dioxin
solvent
liquid
polar solvent
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
GB4929572A
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.)
Hercules LLC
Original Assignee
Hercules LLC
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 Hercules LLC filed Critical Hercules LLC
Publication of GB1357053A publication Critical patent/GB1357053A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D319/00—Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D319/10—1,4-Dioxanes; Hydrogenated 1,4-dioxanes
    • C07D319/14—1,4-Dioxanes; Hydrogenated 1,4-dioxanes condensed with carbocyclic rings or ring systems
    • C07D319/24—[b,e]-condensed with two six-membered rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Extraction Or Liquid Replacement (AREA)

Abstract

1357053 2,4,5 - Trichlorophenoxyacetic acid HERCULES Inc 25 Oct 1972 [26 Oct 1971] 49295/72 Heading C2C 2,4,5 - Trichlorophenoxyacetic acid (2,4,5 - T) contaminated with dioxin is purified by effecting fractional liquid-liquid extraction of said dioxincontaminated 2,4,5-T with a polar liquid solvent and a non-polar liquid solvent, said dioxin and said 2,4,5-T being soluble in both of said solvents, said solvents being immiscible with each other and under the conditions of the extraction yielding rapid breaking polar and non-polar solutions, the volumetric ratio of polar liquid solvent to non-polar liquid solvent being selected so that more 2,4,5-T is dissolved by the polar solvent than by the non-polar solvent while more dioxin is dissolved by the non-polar solvent than by the polar solvent, whereby there are obtained a raffinate fraction comprising 2,4,5-T with dioxin at a substantially reduced weight ratio to the 2,4,5-T, and an extract fraction with a substantial portion of the dioxin content of the original dioxincontaminated 2,4,5-T. The purified 2,4,5-T is recovered from the raffinate, e.g. by distilling off the polar solvent. In the example, the polar solvent is a mixture of acetonitrile (90% by vol.) and water (10% by vol.) and the non- polar solvent is n-hexane.
GB4929572A 1971-10-26 1972-10-25 Process for separating dioxin from dioxin-contaminated2,4,5- trichlorophenoxyacetic acid Expired GB1357053A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19229871A 1971-10-26 1971-10-26

Publications (1)

Publication Number Publication Date
GB1357053A true GB1357053A (en) 1974-06-19

Family

ID=22709100

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4929572A Expired GB1357053A (en) 1971-10-26 1972-10-25 Process for separating dioxin from dioxin-contaminated2,4,5- trichlorophenoxyacetic acid

Country Status (6)

Country Link
BE (1) BE790557A (en)
CA (1) CA973563A (en)
DE (1) DE2252562A1 (en)
FR (1) FR2161932A1 (en)
GB (1) GB1357053A (en)
NL (1) NL7214523A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025919A1 (en) * 1979-09-04 1981-04-01 Rohm And Haas Company A process for preferentially removing more planar molecules from mixtures with less planar molecules
CN112607939A (en) * 2020-12-01 2021-04-06 维讯化工（南京）有限公司 Method for recovering cyhalofop-butyl solvent by using continuous extraction method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4326882A (en) * 1978-08-28 1982-04-27 Ppg Industries, Inc. Trichlorophenoxy alkanoic acid free of chlorinated dibenzo-p-dioxins

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025919A1 (en) * 1979-09-04 1981-04-01 Rohm And Haas Company A process for preferentially removing more planar molecules from mixtures with less planar molecules
CN112607939A (en) * 2020-12-01 2021-04-06 维讯化工（南京）有限公司 Method for recovering cyhalofop-butyl solvent by using continuous extraction method
CN112607939B (en) * 2020-12-01 2022-09-09 维讯化工（南京）有限公司 Method for recovering cyhalofop-butyl solvent by using continuous extraction method

Also Published As

Publication number Publication date
CA973563A (en) 1975-08-26
BE790557A (en) 1973-04-25
FR2161932A1 (en) 1973-07-13
NL7214523A (en) 1973-05-01
DE2252562A1 (en) 1973-05-03

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Legal Events

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