JPS5735544A - Preparation of terephthalic acid - Google Patents
Preparation of terephthalic acidInfo
- Publication number
- JPS5735544A JPS5735544A JP11129680A JP11129680A JPS5735544A JP S5735544 A JPS5735544 A JP S5735544A JP 11129680 A JP11129680 A JP 11129680A JP 11129680 A JP11129680 A JP 11129680A JP S5735544 A JPS5735544 A JP S5735544A
- Authority
- JP
- Japan
- Prior art keywords
- reactor
- terephthalic acid
- oxidized
- xylene
- amount
- 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 obtain terephthalic acid of high purity with a low 4-carboxybenzaldehyde content and high transmittance, by oxidizing p-xylene in three stages by the SD method, and bringing the oxidation product into contact with H2 to reduce the amount of acetic acid solvent to be burned.
CONSTITUTION: p-Xylene is oxidized with O2 in acetic acid solvent in the presence of a catalyst containing a heavy metal and bromine to give terephthalic acid (by the SD method). In the process, 90wt% p-xylene is oxidized with O2 to terephthalic acid at 180W230°C in the first reactor and then further oxidized with O2 at a temperature 0W50°C lower than that in the first reactor in the second reactor. The oxidation product is then oxidized with O2 in the third reactor at a temperature of 250°C or above for 5W60min and then brought into contact with H2 in the fourth reactor at a temperature lower than that in the third reactor and 240°C or above. The resultant product is then crystallized and separated from the liquid to give the aimed terephthalic acid. The fourth reaction permits the reduction in the intermediate content in the terephthalic acid particles and the amount of the O2 to be supplied to the third reactor. Thus, the amount of the acetic acid to be burned can be suppressed.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11129680A JPS5735544A (en) | 1980-08-13 | 1980-08-13 | Preparation of terephthalic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11129680A JPS5735544A (en) | 1980-08-13 | 1980-08-13 | Preparation of terephthalic acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5735544A true JPS5735544A (en) | 1982-02-26 |
| JPS6323983B2 JPS6323983B2 (en) | 1988-05-18 |
Family
ID=14557617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11129680A Granted JPS5735544A (en) | 1980-08-13 | 1980-08-13 | Preparation of terephthalic acid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5735544A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772748A (en) * | 1982-12-10 | 1988-09-20 | Mitsubishi Chemical Industries Limited | Process for producing highly pure terephthalic acid |
| JP2016539106A (en) * | 2013-12-19 | 2016-12-15 | ハンワ ケミカル コーポレイション | Method for hydrogenating phthalate compounds |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0514756A (en) * | 2004-09-02 | 2008-06-24 | Eastman Chem Co | process for producing aromatic dicarboxylic acids, and apparatus |
-
1980
- 1980-08-13 JP JP11129680A patent/JPS5735544A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772748A (en) * | 1982-12-10 | 1988-09-20 | Mitsubishi Chemical Industries Limited | Process for producing highly pure terephthalic acid |
| JP2016539106A (en) * | 2013-12-19 | 2016-12-15 | ハンワ ケミカル コーポレイション | Method for hydrogenating phthalate compounds |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6323983B2 (en) | 1988-05-18 |
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