JPS5540634A - Preparation of high purity terephthalic acid - Google Patents

Preparation of high purity terephthalic acid

Info

Publication number
JPS5540634A
JPS5540634A JP11399178A JP11399178A JPS5540634A JP S5540634 A JPS5540634 A JP S5540634A JP 11399178 A JP11399178 A JP 11399178A JP 11399178 A JP11399178 A JP 11399178A JP S5540634 A JPS5540634 A JP S5540634A
Authority
JP
Japan
Prior art keywords
acid
terephthalic acid
high purity
xylene
oxidized
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
JP11399178A
Other languages
Japanese (ja)
Inventor
Katsuhiko Nishiguchi
Katsuya Murakami
Tetsuo Mizukami
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.)
Kuraray Yuka Co Ltd
Original Assignee
Kuraray Yuka 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 Kuraray Yuka Co Ltd filed Critical Kuraray Yuka Co Ltd
Priority to JP11399178A priority Critical patent/JPS5540634A/en
Publication of JPS5540634A publication Critical patent/JPS5540634A/en
Pending legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Abstract

PURPOSE: To prepare high purity title compound economically, in an industrial scale, with low solvent loss, by re-oxidizing a reaction slurry obtained by the liquid- phase oxidation of p-xylene, while keeping the concentration of p-toluic acid and the color strength of terephthalic acid within specific ranges.
CONSTITUTION: p-Xylene is oxidized in liquid phase in a single step reaction, with an oxygen-containing gas, pref. air, in the presence of a heavy metal catalyst such as Co and Mn, and a bromine compound such as bromine, hydrogen bromide, etc., in a lower aliphatic carboxylic acid such as acetic acid, propionic acid, etc. as a solvent. The redulting reaction mixture is re-oxidized in a re-oxidizing reactor, while keeping the concentration of p-toluic acid in the mother liquor within 300W 1200ppm, and the color strength of terephthalic acid in the slurry within 0.08W0.30. The high purity terephthalic acid thus obtained is useful as a raw material of fiber- grade polyester.
COPYRIGHT: (C)1980,JPO&Japio
JP11399178A 1978-09-15 1978-09-15 Preparation of high purity terephthalic acid Pending JPS5540634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11399178A JPS5540634A (en) 1978-09-15 1978-09-15 Preparation of high purity terephthalic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11399178A JPS5540634A (en) 1978-09-15 1978-09-15 Preparation of high purity terephthalic acid

Publications (1)

Publication Number Publication Date
JPS5540634A true JPS5540634A (en) 1980-03-22

Family

ID=14626312

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11399178A Pending JPS5540634A (en) 1978-09-15 1978-09-15 Preparation of high purity terephthalic acid

Country Status (1)

Country Link
JP (1) JPS5540634A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5016630A (en) * 1973-06-11 1975-02-21
JPS51136640A (en) * 1975-05-22 1976-11-26 Kuraray Yuka Kk Process for continuous preparation of high purity terephthalic acid
JPS52108946A (en) * 1976-03-05 1977-09-12 Kuraray Yuka Kk Production of purified terephthalic acid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5016630A (en) * 1973-06-11 1975-02-21
JPS51136640A (en) * 1975-05-22 1976-11-26 Kuraray Yuka Kk Process for continuous preparation of high purity terephthalic acid
JPS52108946A (en) * 1976-03-05 1977-09-12 Kuraray Yuka Kk Production of purified terephthalic acid

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