GB715839A - A process for the recovery of dimethyl formamide from its aqueous solutions - Google Patents

A process for the recovery of dimethyl formamide from its aqueous solutions

Info

Publication number
GB715839A
GB715839A GB100952A GB100952A GB715839A GB 715839 A GB715839 A GB 715839A GB 100952 A GB100952 A GB 100952A GB 100952 A GB100952 A GB 100952A GB 715839 A GB715839 A GB 715839A
Authority
GB
United Kingdom
Prior art keywords
dimethyl formamide
methylene chloride
chloride
solvent
aqueous
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
GB100952A
Inventor
Leslie Arthur Bashford
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.)
Akzo Nobel UK PLC
Original Assignee
Courtaulds PLC
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 NLAANVRAGE7609488,B priority Critical patent/NL175054B/en
Priority to NL78560D priority patent/NL78560C/xx
Application filed by Courtaulds PLC filed Critical Courtaulds PLC
Priority to GB100952A priority patent/GB715839A/en
Priority to FR1069553D priority patent/FR1069553A/en
Publication of GB715839A publication Critical patent/GB715839A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/02—Recovery or working-up of waste materials of solvents, plasticisers or unreacted monomers
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/18—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Polyacrylonitrile threads are prepared by extruding a dimethyl formamide solution of the polymer into an aqueous coagulating bath containing potassium acetate, calcium chloride or zinc chloride, bromide or iodide. The dimethyl formamide may be recovered subsequently from the bath by solvent extraction with a methylene chloride solvent (see Group IV (b)). Specifications 584,548 and 706,263 and U.S.A. Specification 2,467,553 are referred to.ALSO:Dimethyl formamide is recovered from its aqueous solution by extracting with methylene chloride or with a homogeneous mixed solvent containing at least 70 per cent by weight of methylene chloride and up to 30 per cent by weight of a substantially water-immiscible inert organic solvent miscible with methylene chloride and having a specific gravity less than 1.0 such as benzene and separating the dimethyl formamide from the extract by distillation. In place of benzene, there may be used toluene, aliphatic hydrocarbons such as n-heptane and n-octane and chlorinated hydrocarbons such as allyl chloride and amyl chloride. The process finds application in the recovery of dimethyl formamide from its aqueous solutions obtained when polyacrylonitrile in dimethyl formamide solution is extruded into aqueous coagulating baths such as are described in Specifications 584,548 and 706,263, [Group IV (a)], and U.S.A. Specification 2,467,553. An example is given. According to the Provisional Specification the solvent consists of or contains a major proportion of methylene chloride.
GB100952A 1952-01-14 1952-01-14 A process for the recovery of dimethyl formamide from its aqueous solutions Expired GB715839A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NLAANVRAGE7609488,B NL175054B (en) 1952-01-14 PROCEDURE FOR THERMAL TREASURE FOR A GLASS PLATE.
NL78560D NL78560C (en) 1952-01-14
GB100952A GB715839A (en) 1952-01-14 1952-01-14 A process for the recovery of dimethyl formamide from its aqueous solutions
FR1069553D FR1069553A (en) 1952-01-14 1953-01-13 Process for recovering dimethyl formiamide from its aqueous solutions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB100952A GB715839A (en) 1952-01-14 1952-01-14 A process for the recovery of dimethyl formamide from its aqueous solutions

Publications (1)

Publication Number Publication Date
GB715839A true GB715839A (en) 1954-09-22

Family

ID=9714547

Family Applications (1)

Application Number Title Priority Date Filing Date
GB100952A Expired GB715839A (en) 1952-01-14 1952-01-14 A process for the recovery of dimethyl formamide from its aqueous solutions

Country Status (3)

Country Link
FR (1) FR1069553A (en)
GB (1) GB715839A (en)
NL (2) NL175054B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086050A (en) * 1960-07-19 1963-04-16 Snia Viscosa Process and means for extracting organic solvents from baths containing them
US3713991A (en) * 1969-05-28 1973-01-30 Porvair Ltd Recovery of dimethylformamide by crystallization and distillation
US10370398B2 (en) 2016-06-23 2019-08-06 Tate & Lyle Technology Limited Liquid-liquid extraction of DMF

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1423441A (en) * 1972-05-18 1976-02-04 Teijin Ltd Production of polyamide fibres

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086050A (en) * 1960-07-19 1963-04-16 Snia Viscosa Process and means for extracting organic solvents from baths containing them
US3713991A (en) * 1969-05-28 1973-01-30 Porvair Ltd Recovery of dimethylformamide by crystallization and distillation
US10370398B2 (en) 2016-06-23 2019-08-06 Tate & Lyle Technology Limited Liquid-liquid extraction of DMF
US10899783B2 (en) 2016-06-23 2021-01-26 Tate & Lyle Technology Limited Liquid-liquid extraction of DMF

Also Published As

Publication number Publication date
NL175054B (en)
FR1069553A (en) 1954-07-09
NL78560C (en)

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