GB830801A - Purification of terephthalic acid - Google Patents
Purification of terephthalic acidInfo
- Publication number
- GB830801A GB830801A GB16154/57A GB1615457A GB830801A GB 830801 A GB830801 A GB 830801A GB 16154/57 A GB16154/57 A GB 16154/57A GB 1615457 A GB1615457 A GB 1615457A GB 830801 A GB830801 A GB 830801A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terephthalic acid
- acid
- impurities
- purified
- sulphoxide
- 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.)
- Expired
Links
Classifications
-
- 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
-
- 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
- C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
Abstract
In a process for the purification of terephthalic acid containing coloured or colourforming impurities, the crude acid and the impurities are dissolved in a dialkyl sulphoxide, if desired in admixture with other known solvents for terephthalic acid, if necessary with the assistance of heat and the purified acid is recovered by separation from the solution in which the impurities remain dissolved. Dimethyl and diethyl sulphoxides are the sulphoxides specified and other known solvents mentioned are acetic acid, benzoic acid and water. The terephthalic acid may be recovered from its solution in the sulphoxide by cooling or by dilution with water. Preferably dimethyl sulphoxide is employed at atmospheric pressure though superatmospheric pressures may be employed, if desired. Examples, which include a continuous process, are described. The conversion of purified terephthalic acid to a polyester is described (see Group IV (a)).ALSO:Polyesters of terephthalic acid are prepared by esterifying terephthalic acid with 7 mols. of ethylene glycol and subjecting such ester to poly-condensation in the presence of antimony oxide, such terephthalic acid having been purified from coloured or colour-forming impurities by a process in which the crude acid and the impurities are dissolved in a dialkyl sulphoxide, if desired in admixture with other known solvents for terephthalic acid, if necessary with the assistance of heat and the purified acid, is recovered by separation from the solution in which the impurities remain dissolved (see Group IV (b)).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB16154/57A GB830801A (en) | 1957-05-21 | 1957-05-21 | Purification of terephthalic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB16154/57A GB830801A (en) | 1957-05-21 | 1957-05-21 | Purification of terephthalic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB830801A true GB830801A (en) | 1960-03-23 |
Family
ID=10072150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16154/57A Expired GB830801A (en) | 1957-05-21 | 1957-05-21 | Purification of terephthalic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB830801A (en) |
-
1957
- 1957-05-21 GB GB16154/57A patent/GB830801A/en not_active Expired
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