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GB818211A - Manufacture of pure terephthalic acid - Google Patents

Manufacture of pure terephthalic acid

Info

Publication number
GB818211A
GB818211A GB3196055A GB3196055A GB818211A GB 818211 A GB818211 A GB 818211A GB 3196055 A GB3196055 A GB 3196055A GB 3196055 A GB3196055 A GB 3196055A GB 818211 A GB818211 A GB 818211A
Authority
GB
United Kingdom
Prior art keywords
acid
terephthalic acid
liquors
mother
purified
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
GB3196055A
Inventor
Helmut Jockusch
Otto Fuchs
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.)
Hoechst AG
Original Assignee
Hoechst AG
Farbwerke Hoechst 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 Hoechst AG, Farbwerke Hoechst AG filed Critical Hoechst AG
Priority to GB3196055A priority Critical patent/GB818211A/en
Publication of GB818211A publication Critical patent/GB818211A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation

Landscapes

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

Abstract

Crude terephthalic acid is purified by recrystallization from boiling N : N-dimethyl formamide. The mother-liquors may be used to recrystallize further portions of crude acid. Further pure acid may be obtained from the mother-liquors by adding an organic liquid which dissolves the impurities but not terephthalic acid and is miscible with N : N-dimethyl formamide, such as methanol, ethanol, isopropanol, dichlorethane, chlorethane, methylene chloride, carbon tetrachloride, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, acetone, methyl ethyl ketone, toluene, benzene, and tetrahydro-naphthalene, and which may be diluted with aliphatic hydrocarbons such as petroleum ether. When terephthalic acid containing p-toluic acid is purified, the p-toluic acid may be recovered from the residual mother-liquors by distillation of the solvent or by dilution with water. Examples are given.
GB3196055A 1955-11-08 1955-11-08 Manufacture of pure terephthalic acid Expired GB818211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3196055A GB818211A (en) 1955-11-08 1955-11-08 Manufacture of pure terephthalic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3196055A GB818211A (en) 1955-11-08 1955-11-08 Manufacture of pure terephthalic acid

Publications (1)

Publication Number Publication Date
GB818211A true GB818211A (en) 1959-08-12

Family

ID=10330943

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3196055A Expired GB818211A (en) 1955-11-08 1955-11-08 Manufacture of pure terephthalic acid

Country Status (1)

Country Link
GB (1) GB818211A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123632A (en) * 1964-03-03 Process for the production of the
WO1998024749A1 (en) * 1996-12-06 1998-06-11 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid
US5929274A (en) 1995-06-07 1999-07-27 Hfm International, Inc. Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid
US5961935A (en) 1995-06-07 1999-10-05 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid
WO1999062857A1 (en) * 1998-05-29 1999-12-09 Hfm International, Inc. Method for preparing purified terephthalic acid and isophthalic acid from mixed xylenes
US6054610A (en) 1995-06-07 2000-04-25 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenes
EP1030829A1 (en) * 1997-10-31 2000-08-30 HFM International, Inc. Method and apparatus for preparing purified terephthalic acid
WO2006088470A2 (en) * 2004-04-09 2006-08-24 Gtc Technology Inc. Purification of carboxylic acids by complexation with selective solvents

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123632A (en) * 1964-03-03 Process for the production of the
US6054610A (en) 1995-06-07 2000-04-25 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenes
US5929274A (en) 1995-06-07 1999-07-27 Hfm International, Inc. Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid
US5961935A (en) 1995-06-07 1999-10-05 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid
US6013835A (en) 1995-06-07 2000-01-11 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid
US6113866A (en) 1995-06-07 2000-09-05 Hfm International, Inc. Apparatus for preparing purified terephthalic acid
WO1998024749A1 (en) * 1996-12-06 1998-06-11 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid
EP1030829A1 (en) * 1997-10-31 2000-08-30 HFM International, Inc. Method and apparatus for preparing purified terephthalic acid
EP1030829A4 (en) * 1997-10-31 2003-01-02 Hfm Int Inc Method and apparatus for preparing purified terephthalic acid
WO1999062857A1 (en) * 1998-05-29 1999-12-09 Hfm International, Inc. Method for preparing purified terephthalic acid and isophthalic acid from mixed xylenes
WO2006088470A2 (en) * 2004-04-09 2006-08-24 Gtc Technology Inc. Purification of carboxylic acids by complexation with selective solvents
WO2006088470A3 (en) * 2004-04-09 2007-03-29 Gtc Technology Inc Purification of carboxylic acids by complexation with selective solvents
US7307188B2 (en) 2004-04-09 2007-12-11 Gtc Technology, Inc. Purification of carboxylic acids by complexation with selective solvents

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