GB989438A - Process for purifying terephthalic acid - Google Patents

Process for purifying terephthalic acid

Info

Publication number
GB989438A
GB989438A GB789862A GB789862A GB989438A GB 989438 A GB989438 A GB 989438A GB 789862 A GB789862 A GB 789862A GB 789862 A GB789862 A GB 789862A GB 989438 A GB989438 A GB 989438A
Authority
GB
United Kingdom
Prior art keywords
terephthalic acid
alkaline
solution
water
heating
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
GB789862A
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.)
Toray Industries Inc
Original Assignee
Toyo Rayon Co Ltd
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 Toyo Rayon Co Ltd filed Critical Toyo Rayon Co Ltd
Publication of GB989438A publication Critical patent/GB989438A/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

Terephthalic acid is purified by heating crude terephthalic acid, water and an amount of a water-soluble alkaline material not exceeding 0.61 equivalents for each equivalent of the terephthalic acid to form a solution, cooling the solution and separating the solid terephthalic acid which forms. Preferably the heating is carried out at a temperature of at least 200 DEG C. Preferred alkaline compounds are the hydroxides of the alkali metals, alkaline earth metals and ammonia, and the ammonium, alkali metal and alkaline earth metal salts of weak inorganic and organic acids. The alkaline compounds may be used alone or in combination. The terephthalic acid that is present as its salt with the alkaline compound in the filtrate remaining after separation of solid terephthalic acid may be recovered by acidifying and recycling to a further recrystallization. Detailed examples are given.
GB789862A 1961-03-09 1962-02-28 Process for purifying terephthalic acid Expired GB989438A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP783661 1961-03-09
JP783561 1961-03-09

Publications (1)

Publication Number Publication Date
GB989438A true GB989438A (en) 1965-04-14

Family

ID=26342210

Family Applications (1)

Application Number Title Priority Date Filing Date
GB789862A Expired GB989438A (en) 1961-03-09 1962-02-28 Process for purifying terephthalic acid

Country Status (2)

Country Link
DE (1) DE1468723A1 (en)
GB (1) GB989438A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465035A (en) * 1964-11-25 1969-09-02 Sumitomo Chemical Co Process for purifying terephthalic acid
US5149867A (en) * 1987-07-28 1992-09-22 Hatco Corporation Crystallization of water-insoluble dicarboxylic acid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465035A (en) * 1964-11-25 1969-09-02 Sumitomo Chemical Co Process for purifying terephthalic acid
US5149867A (en) * 1987-07-28 1992-09-22 Hatco Corporation Crystallization of water-insoluble dicarboxylic acid

Also Published As

Publication number Publication date
DE1468723A1 (en) 1969-11-20

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