GB881460A - Purification of phthalic acids - Google Patents

Purification of phthalic acids

Info

Publication number
GB881460A
GB881460A GB852360A GB852360A GB881460A GB 881460 A GB881460 A GB 881460A GB 852360 A GB852360 A GB 852360A GB 852360 A GB852360 A GB 852360A GB 881460 A GB881460 A GB 881460A
Authority
GB
United Kingdom
Prior art keywords
acid
phthalic
acids
permanganate
sodium
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
GB852360A
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.)
Solutia Inc
Original Assignee
Chemstrand Corp
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 Chemstrand Corp filed Critical Chemstrand Corp
Publication of GB881460A publication Critical patent/GB881460A/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
    • C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification

Abstract

A process for purifying crude phthalic acids obtained by the oxidation of a dialkylbenzene in the liquid phase by means of molecular oxygen or a molecular oxygen-containing gas, comprises the steps of subjecting the crude phthalic acid to contact in an aqueous alkaline solution with sodium or potassium dichromate or permanganate, treating the alkaline solution with activated carbon, precipitating the phthalic acid by adding the thus-treated solution to a second acid having an ionisation constant greater than that of the phthalic acid, separating the precipitated phthalic and washing it with water. Specified aqueous alkaline solutions are those of sodium and potassium hydroxides, ammonia and trimethylamine. Specified second acids are sulphuric, hydrochloric, acetic, sulphurous and nitric acids. In examples crude terephthalic acid is purified by the above process. Processes wherein the treatment with permanganate or dichromate or activated carbon is omitted or wherein the second acid is added to the treated solution are described for comparison.
GB852360A 1959-04-06 1960-03-10 Purification of phthalic acids Expired GB881460A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80410459A 1959-04-06 1959-04-06

Publications (1)

Publication Number Publication Date
GB881460A true GB881460A (en) 1961-11-01

Family

ID=25188192

Family Applications (1)

Application Number Title Priority Date Filing Date
GB852360A Expired GB881460A (en) 1959-04-06 1960-03-10 Purification of phthalic acids

Country Status (4)

Country Link
CH (1) CH395958A (en)
DE (1) DE1140922B (en)
GB (1) GB881460A (en)
NL (1) NL250177A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050312A (en) * 1964-05-13

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
US6113866A (en) 1995-06-07 2000-09-05 Hfm International, Inc. Apparatus for preparing purified terephthalic acid

Also Published As

Publication number Publication date
NL250177A (en)
CH395958A (en) 1965-07-31
DE1140922B (en) 1962-12-13

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