JPS5679635A - Purification of terephthalic acid - Google Patents

Purification of terephthalic acid

Info

Publication number
JPS5679635A
JPS5679635A JP15664179A JP15664179A JPS5679635A JP S5679635 A JPS5679635 A JP S5679635A JP 15664179 A JP15664179 A JP 15664179A JP 15664179 A JP15664179 A JP 15664179A JP S5679635 A JPS5679635 A JP S5679635A
Authority
JP
Japan
Prior art keywords
terephthalic acid
hydrogenation
hydrogen
cba
dialkylbenzene
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.)
Granted
Application number
JP15664179A
Other languages
Japanese (ja)
Other versions
JPS5911573B2 (en
Inventor
Tazuo Oota
Akira Chiba
Tsuneo Furukawa
Shinobu Yamagami
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.)
Mizushima Aroma Co Ltd
Mitsubishi Gas Chemical Co Inc
Toyobo Co Ltd
Original Assignee
Mizushima Aroma Co Ltd
Mitsubishi Gas Chemical Co Inc
Toyobo 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 Mizushima Aroma Co Ltd, Mitsubishi Gas Chemical Co Inc, Toyobo Co Ltd filed Critical Mizushima Aroma Co Ltd
Priority to JP15664179A priority Critical patent/JPS5911573B2/en
Publication of JPS5679635A publication Critical patent/JPS5679635A/en
Publication of JPS5911573B2 publication Critical patent/JPS5911573B2/en
Expired legal-status Critical Current

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

Abstract

PURPOSE: To obtain high purity terephthalic acid, useful for the direct polymerization of polyester which is material of fibers etc., by carrying out the catalytic hydrogenation of crude terephthalic acid obtained by the liquid phase oxidation of p-dialkylbenzene, twice.
CONSTITUTION: An aqueous solution of crude terephthalic acid containing impurities such as 4-carboxybenzaldehyde (hereafter abbreviated 4 CBA) and obtained by the liquid phase oxidation of p-dialkylbenzene, is subjected to the hydrogenation twice at high temp. and pressure in the presence of a catalyst of VIII group noble metal to give a high purity terephthalic acid. The total amount of hydrogen used is 2.0W20 times mole of 4 CBA contained in the aqueous solution of the crude terephthalic acid. Hydrogen used in the first hydrogenation is 0.35W1.95 times mole of the above 4 CBA, and hydrogen is supplemented in the subsequent hydrogenation. When the amount of hydrogen in the first hydrogenation is out of the range mentioned above, the activity of the catalyst is rapidly deteriorated and the catalytic life is shortened to lower the qualities the terephthalic acid.
COPYRIGHT: (C)1981,JPO&Japio
JP15664179A 1979-12-03 1979-12-03 Terephthalic acid purification method Expired JPS5911573B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15664179A JPS5911573B2 (en) 1979-12-03 1979-12-03 Terephthalic acid purification method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15664179A JPS5911573B2 (en) 1979-12-03 1979-12-03 Terephthalic acid purification method

Publications (2)

Publication Number Publication Date
JPS5679635A true JPS5679635A (en) 1981-06-30
JPS5911573B2 JPS5911573B2 (en) 1984-03-16

Family

ID=15632097

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15664179A Expired JPS5911573B2 (en) 1979-12-03 1979-12-03 Terephthalic acid purification method

Country Status (1)

Country Link
JP (1) JPS5911573B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100398160B1 (en) * 1999-09-07 2003-09-19 미쓰이 가가쿠 가부시키가이샤 Process for producing aromatic carboxylic acid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100398160B1 (en) * 1999-09-07 2003-09-19 미쓰이 가가쿠 가부시키가이샤 Process for producing aromatic carboxylic acid

Also Published As

Publication number Publication date
JPS5911573B2 (en) 1984-03-16

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