JPS5540634A - Preparation of high purity terephthalic acid - Google Patents
Preparation of high purity terephthalic acidInfo
- 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
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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
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
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)
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 |
-
1978
- 1978-09-15 JP JP11399178A patent/JPS5540634A/en active Pending
Patent Citations (3)
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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