JPS56103136A - Purification of terephthalic acid - Google Patents
Purification of terephthalic acidInfo
- Publication number
- JPS56103136A JPS56103136A JP621580A JP621580A JPS56103136A JP S56103136 A JPS56103136 A JP S56103136A JP 621580 A JP621580 A JP 621580A JP 621580 A JP621580 A JP 621580A JP S56103136 A JPS56103136 A JP S56103136A
- Authority
- JP
- Japan
- Prior art keywords
- terephthalic acid
- impurities
- activated charcoal
- purification
- hydrogenation
- 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
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 title abstract 14
- 238000000746 purification Methods 0.000 title abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 8
- 239000012535 impurity Substances 0.000 abstract 6
- 239000007864 aqueous solution Substances 0.000 abstract 3
- 238000005984 hydrogenation reaction Methods 0.000 abstract 3
- 239000003054 catalyst Substances 0.000 abstract 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 239000003513 alkali Substances 0.000 abstract 1
- 125000003118 aryl group Chemical group 0.000 abstract 1
- 239000010419 fine particle Substances 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- 238000002834 transmittance Methods 0.000 abstract 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To suppress the hydrogenation loss of the aromatic nucleus in the purification or terephthalic acid by the hydrogenation of crude terephthalic acid containing colored impurities in an alkaline aqueous solution in the presence of a Ru catalyst, by carrying out the purification in the copresence of free activated charcoal.
CONSTITUTION: Crude terephthalic acid containing impurities which lower the light transmittance at 340nm when dissolved in an alkaline aqueous solution, is dissolved in an alkaline aqueous solution containing ≥0.3 equivalent, pref. 0.8W2 equivalent, based on 1 equivalent of terephthalic acid, of an alkali, and hydrogenated under a hydrogen partial pressure of 2W60atm, at 130W300°C, in the presence of 0.001W 10wt% (as metal), based on the terephthalic acid to be treated, of a Ru catalyst and 0.5W50wt% of free activated charcoal (pref. activated charcoal of food refining grade). The colored impurities are converted to colorless impurities, and the impurities resistant to hydrogenation are adsorbed to the activated charcoal. The colorless impurities can be separated easily from the fine particles of terephthalic acid by the following treatment.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP621580A JPS56103136A (en) | 1980-01-22 | 1980-01-22 | Purification of terephthalic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP621580A JPS56103136A (en) | 1980-01-22 | 1980-01-22 | Purification of terephthalic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56103136A true JPS56103136A (en) | 1981-08-18 |
Family
ID=11632294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP621580A Pending JPS56103136A (en) | 1980-01-22 | 1980-01-22 | Purification of terephthalic acid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56103136A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020046902A (en) * | 2000-12-14 | 2002-06-21 | 유현식 | The stable catalyst for hydropurification and the process for purification using the same |
-
1980
- 1980-01-22 JP JP621580A patent/JPS56103136A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020046902A (en) * | 2000-12-14 | 2002-06-21 | 유현식 | The stable catalyst for hydropurification and the process for purification using the same |
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