TWI266764B - Method for producing terephthalic acid - Google Patents
Method for producing terephthalic acidInfo
- Publication number
- TWI266764B TWI266764B TW093134052A TW93134052A TWI266764B TW I266764 B TWI266764 B TW I266764B TW 093134052 A TW093134052 A TW 093134052A TW 93134052 A TW93134052 A TW 93134052A TW I266764 B TWI266764 B TW I266764B
- Authority
- TW
- Taiwan
- Prior art keywords
- terephthalic acid
- water
- dissolving
- xylene
- crude terephthalic
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
- C07C63/14—Monocyclic dicarboxylic acids
- C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
- C07C63/26—1,4 - Benzenedicarboxylic acid
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
To provide a method for producing terephthalic acid, capable of reusing discharged water from a process of purifying crude terephthalic acid as the water for purifying the crude terephthalic acid and further capable of improving the yield of terephthalic acid. This method for producing the terephthalic acid is provided by dissolving the crude terephthalic acid obtained by oxidizing p-xylene by heating under pressure, evaporating water by reducing the pressure to crystallize the terephthalic acid, bringing condensed water obtained by condensing the evaporated water in contact with p-xylene, then separating the water and reusing in any of the processes of the production of the terephthalic acid. Also, the condensed water is reused as a water for dissolving the crude terephthalic acid. It is preferable to evaporate 30-70 wt.% water necessary for dissolving the crude terephthalic acid from a crystallization vessel by adjusting the crystallization condition and to remove impurity from the evaporated water by a p-xylene extraction.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003421776 | 2003-12-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
TW200530175A TW200530175A (en) | 2005-09-16 |
TWI266764B true TWI266764B (en) | 2006-11-21 |
Family
ID=34878924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW093134052A TWI266764B (en) | 2003-12-19 | 2004-11-09 | Method for producing terephthalic acid |
Country Status (3)
Country | Link |
---|---|
KR (1) | KR100650536B1 (en) |
CN (1) | CN1318376C (en) |
TW (1) | TWI266764B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102026952B (en) * | 2008-05-20 | 2014-05-07 | 株式会社日立制作所 | Method for treating separated mother liquor from terephthalic acid refinement |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2899928B2 (en) * | 1991-03-07 | 1999-06-02 | 三井化学株式会社 | Method for treating purified mother liquor of terephthalic acid |
GB9714907D0 (en) * | 1997-07-16 | 1997-09-17 | Ici Plc | Production of aromatic carboxylic acids |
US6143926A (en) * | 1999-09-21 | 2000-11-07 | E. I. Du Pont De Nemours And Company | Process for producing pure terephthalic acid with improved recovery of precursors, solvent and methyl acetate |
US7196215B2 (en) * | 2001-06-04 | 2007-03-27 | Eastman Chemical Company | Process for the production of purified terephthalic acid |
-
2004
- 2004-10-25 KR KR1020040085175A patent/KR100650536B1/en active IP Right Grant
- 2004-11-09 TW TW093134052A patent/TWI266764B/en active
- 2004-11-30 CN CNB2004100982251A patent/CN1318376C/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN1318376C (en) | 2007-05-30 |
KR20050062360A (en) | 2005-06-23 |
CN1651393A (en) | 2005-08-10 |
TW200530175A (en) | 2005-09-16 |
KR100650536B1 (en) | 2006-11-27 |
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