JPS5640639A - Purification of terephthalic acid - Google Patents

Purification of terephthalic acid

Info

Publication number
JPS5640639A
JPS5640639A JP11517379A JP11517379A JPS5640639A JP S5640639 A JPS5640639 A JP S5640639A JP 11517379 A JP11517379 A JP 11517379A JP 11517379 A JP11517379 A JP 11517379A JP S5640639 A JPS5640639 A JP S5640639A
Authority
JP
Japan
Prior art keywords
terephthalic acid
impurity
purified
purification
stage
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.)
Pending
Application number
JP11517379A
Other languages
Japanese (ja)
Inventor
Hajime Torigata
Kenji Nakaoka
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
Toray Industries Inc
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 Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP11517379A priority Critical patent/JPS5640639A/en
Publication of JPS5640639A publication Critical patent/JPS5640639A/en
Pending legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

PURPOSE: To obtain the purified terephthalic acid useful as a raw material for fibers by the specific treatment of impure terephthalic acid.
CONSTITUTION: A solution of terephthalic acid containing an impurity to reduce the light transmittance at 340nm in an aqueous alkali is methylated by the addition of dimethylsulfuric acid in a molar amount of 0.1W1.0 time that of the terephthalic acid. The impurity has an unknown structure and comprises coloring substances. The terephthalic acid of low purity recovered from the purifying stage in the production of terephthalic acid or from the recovering stage of a solvent and a catalyst, may be purified readily.
COPYRIGHT: (C)1981,JPO&Japio
JP11517379A 1979-09-10 1979-09-10 Purification of terephthalic acid Pending JPS5640639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11517379A JPS5640639A (en) 1979-09-10 1979-09-10 Purification of terephthalic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11517379A JPS5640639A (en) 1979-09-10 1979-09-10 Purification of terephthalic acid

Publications (1)

Publication Number Publication Date
JPS5640639A true JPS5640639A (en) 1981-04-16

Family

ID=14656147

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11517379A Pending JPS5640639A (en) 1979-09-10 1979-09-10 Purification of terephthalic acid

Country Status (1)

Country Link
JP (1) JPS5640639A (en)

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