JPS5490135A - Preparation of high purity terephthalic acid - Google Patents
Preparation of high purity terephthalic acidInfo
- Publication number
- JPS5490135A JPS5490135A JP15722577A JP15722577A JPS5490135A JP S5490135 A JPS5490135 A JP S5490135A JP 15722577 A JP15722577 A JP 15722577A JP 15722577 A JP15722577 A JP 15722577A JP S5490135 A JPS5490135 A JP S5490135A
- Authority
- JP
- Japan
- Prior art keywords
- oxidation
- acetic acid
- terephthalic acid
- temperature
- immersion treatment
- 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
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To prepare a high purity terephthalic acid for direct polymerization use, having excellent slurrifying characteristics, with low oxidation loss of the acetic acid solvent, by carrying out secific two-stage immersion treatment of a crude product obtained by the relatively mild single stage oxidation of p-xylene.
CONSTITUTION: p-Xylene is oxidized with an O2-containing gas in acetic acid solvent at 170-230°C under pressure, in the presence of a Co-Mn-Br catalyst, and a crude product containing 500-3000 ppm of 4-carboxybenzaldehyde and having an optical density of ≤0.3 at a wave length of 340 mμ is obtained. More than 60 wt% of the above oxidation product is separated and recycled to the oxidation reactor, and the remaining part of the product is added with 2-10 weight times of hot acetic acid to obtain an acetic acid dispersion of crude terephthalic acid. The dispersion is subjected to the primary immersion treatment under agitation at a temperature between the oxidation temperature and 240°C, and then to the secondary immersion treatment under agitation at a temperature lower than the primary treating temperature by at least 10°C, to obtain the high quality terephthalic acid.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15722577A JPS5910650B2 (en) | 1977-12-28 | 1977-12-28 | Production method of high purity terephthalic acid |
DE2856529A DE2856529C2 (en) | 1977-12-28 | 1978-12-28 | Process for the production of terephthalic acid |
US05/973,944 US4241220A (en) | 1977-12-28 | 1978-12-28 | Process for producing terephthalic acid |
GB7850079A GB2014564B (en) | 1977-12-28 | 1978-12-28 | Process for producing terephthalic acid |
FR7836670A FR2413352A1 (en) | 1977-12-28 | 1978-12-28 | PROCESS FOR PREPARING TEREPHTHALIC ACID |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15722577A JPS5910650B2 (en) | 1977-12-28 | 1977-12-28 | Production method of high purity terephthalic acid |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5490135A true JPS5490135A (en) | 1979-07-17 |
JPS5910650B2 JPS5910650B2 (en) | 1984-03-10 |
Family
ID=15644950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15722577A Expired JPS5910650B2 (en) | 1977-12-28 | 1977-12-28 | Production method of high purity terephthalic acid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5910650B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59190947A (en) * | 1983-04-11 | 1984-10-29 | Toyobo Co Ltd | Production of terephthalic acid of high purity |
JP2008540679A (en) * | 2005-05-19 | 2008-11-20 | イーストマン ケミカル カンパニー | Concentrated terephthalic acid composition |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS601407U (en) * | 1983-06-16 | 1985-01-08 | 株式会社 西原環境衛生研究所 | Defoaming device |
-
1977
- 1977-12-28 JP JP15722577A patent/JPS5910650B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59190947A (en) * | 1983-04-11 | 1984-10-29 | Toyobo Co Ltd | Production of terephthalic acid of high purity |
JPH0559099B2 (en) * | 1983-04-11 | 1993-08-30 | Toyo Boseki | |
JP2008540679A (en) * | 2005-05-19 | 2008-11-20 | イーストマン ケミカル カンパニー | Concentrated terephthalic acid composition |
Also Published As
Publication number | Publication date |
---|---|
JPS5910650B2 (en) | 1984-03-10 |
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