GB768273A - Purification of terephthalic acid - Google Patents
Purification of terephthalic acidInfo
- Publication number
- GB768273A GB768273A GB2602054A GB2602054A GB768273A GB 768273 A GB768273 A GB 768273A GB 2602054 A GB2602054 A GB 2602054A GB 2602054 A GB2602054 A GB 2602054A GB 768273 A GB768273 A GB 768273A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terephthalic acid
- purification
- crude terephthalic
- crystals
- acid
- 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
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
<PICT:0768273/IV(b)/1> Crude terephthalic acid containing p-toluic acid is purified by the process of the parent Specification, modified in that the purification is conducted continuously by feeding the aqueous solution of crude terephthalic acid into a crystallizing zone and allowing the crystals to settle while the mother liquor passes on. In a preferred embodiment, hot aqueous terephthalic acid solution enters crystallizer (2) via valve (1) and is cooled, the crystals falling through tube (4) against countercurrent wash water from heater (6), the washed terephthalic acid being obtained as slurry from receiver (8) while mother liquors from (7) pass to two similar crystallizers in series from which crude terephthalic acid, for recycling, and p-toluic acid are obtained respectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2602054A GB768273A (en) | 1954-09-08 | 1954-09-08 | Purification of terephthalic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2602054A GB768273A (en) | 1954-09-08 | 1954-09-08 | Purification of terephthalic acid |
Publications (1)
Publication Number | Publication Date |
---|---|
GB768273A true GB768273A (en) | 1957-02-13 |
Family
ID=10237098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2602054A Expired GB768273A (en) | 1954-09-08 | 1954-09-08 | Purification of terephthalic acid |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB768273A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2905708A (en) * | 1957-12-02 | 1959-09-22 | Standard Oil Co | Production of purified dimethyl terephthalate |
US3235588A (en) * | 1966-02-15 | Purification of benzoic acid |
-
1954
- 1954-09-08 GB GB2602054A patent/GB768273A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3235588A (en) * | 1966-02-15 | Purification of benzoic acid | ||
US2905708A (en) * | 1957-12-02 | 1959-09-22 | Standard Oil Co | Production of purified dimethyl terephthalate |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES306649A1 (en) | A procedure for continuous recovery of p-xylene from liquid mixtures containing p-xylene. (Machine-translation by Google Translate, not legally binding) | |
GB768273A (en) | Purification of terephthalic acid | |
US2816923A (en) | Conversion of maleic acid to fumaric acid | |
US3551300A (en) | By-water dissolution,steam distillation,activated carbon and cation exchange treatment and crystallization | |
US2113248A (en) | Purifying boric acid | |
GB1274798A (en) | A process for preparing 2,2-di(4-hydroxyphenyl) propane of a high degree of purity | |
US2303602A (en) | Calcium tartrate production | |
GB1222678A (en) | Process for purifying melamine | |
GB1082846A (en) | A process for the depotassification of industrial by-products | |
GB1236081A (en) | Method of crystallization | |
GB798633A (en) | Aspirin | |
US2982616A (en) | Method of producing calcium-free crystalline cyanamide | |
SU101573A1 (en) | The method of producing potassium bromide | |
GB1249783A (en) | Concentration of aqueous acetic acid | |
GB781936A (en) | Purification of terephthalic acid | |
SU60210A1 (en) | Method for isolating acetylsalicylic acid salicylate | |
GB1170252A (en) | Process for the Purification of Adiponitrile. | |
GB1066046A (en) | Improved process for the recovery of p-xylene | |
GB815791A (en) | Improvements in or relating to the production of crystals from solutions | |
GB1086028A (en) | Process for the purification of ethylene carbonate | |
US2313605A (en) | Treatment of n-monomethyl-p-aminophenol | |
SU407878A1 (en) | METHOD FOR CLEANING POTASSIUM | |
GB1029132A (en) | Improvements in the production of crystals from solutions | |
GB963359A (en) | Chemical process for recovery of vanadium and copper catalysts | |
SU101164A1 (en) | Steam distribution mechanism of steam air compound pump |