GB932246A - Purification of phthalic acids - Google Patents

Purification of phthalic acids

Info

Publication number
GB932246A
GB932246A GB3830159A GB3830159A GB932246A GB 932246 A GB932246 A GB 932246A GB 3830159 A GB3830159 A GB 3830159A GB 3830159 A GB3830159 A GB 3830159A GB 932246 A GB932246 A GB 932246A
Authority
GB
United Kingdom
Prior art keywords
acid
phthalic acid
phthalic
resulting solution
xylene
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
GB3830159A
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.)
Monsanto Chemicals Ltd
Monsanto Chemical Co
Original Assignee
Monsanto Chemicals Ltd
Monsanto Chemical Co
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 Monsanto Chemicals Ltd, Monsanto Chemical Co filed Critical Monsanto Chemicals Ltd
Publication of GB932246A publication Critical patent/GB932246A/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

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)
  • Polyesters Or Polycarbonates (AREA)

Abstract

A process for purifying crude terephthalic or isophthalic acid obtained by the sulphurammonia oxidation of p-xylene or m-xylene respectively, comprises the steps of forming the ammonium salt of the acid by intimately mixing the crude phthalic acid with an aqueous solution of ammonium hydroxide, contacting the resulting solution with activated carbon, adding the resulting solution to a second acid having an ionisation constant greater than that of the phthalic acid thereby precipatating the phthalic acid and separating and washing the phthalic acid. The acid used for precipitating the phthalic acid may be, for example, hydrochloric, sulphuric, sulphurous or acetic acids. The terephthalic acid purified in accordance with the invention may be used for direct esterification with ethylene glycol. Specification 932,244 is referred to.
GB3830159A 1958-11-18 1959-11-11 Purification of phthalic acids Expired GB932246A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77460958A 1958-11-18 1958-11-18

Publications (1)

Publication Number Publication Date
GB932246A true GB932246A (en) 1963-07-24

Family

ID=25101755

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3830159A Expired GB932246A (en) 1958-11-18 1959-11-11 Purification of phthalic acids

Country Status (6)

Country Link
BE (1) BE584755A (en)
CH (1) CH388922A (en)
DE (1) DE1117100B (en)
FR (1) FR1244576A (en)
GB (1) GB932246A (en)
NL (1) NL245503A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6013835A (en) 1995-06-07 2000-01-11 Hfm International, Inc. Method and apparatus for preparing purified terephthalic acid

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB695170A (en) * 1950-09-07 1953-08-05 Bofors Ab Method of purifying organic compounds
DE1025875B (en) * 1954-08-18 1958-03-13 Basf Ag Process for the separation of accompanying substances from crystalline substances
GB777782A (en) * 1955-06-24 1957-06-26 Ici Ltd Purification of terephthalic acid

Also Published As

Publication number Publication date
NL245503A (en)
BE584755A (en) 1960-05-17
FR1244576A (en) 1960-10-28
CH388922A (en) 1965-03-15
DE1117100B (en) 1961-11-16

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