GB727184A - Separation of terephthalic acid - Google Patents
Separation of terephthalic acidInfo
- Publication number
- GB727184A GB727184A GB3163252A GB3163252A GB727184A GB 727184 A GB727184 A GB 727184A GB 3163252 A GB3163252 A GB 3163252A GB 3163252 A GB3163252 A GB 3163252A GB 727184 A GB727184 A GB 727184A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terephthalic acid
- acid
- per cent
- esterification
- mixture
- 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
- C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
- C07C51/493—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification whereby carboxylic acid esters are formed
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Terephthalic acid is separated from admixture with isophthalic acid, by subjecting the mixture to partial esterification with a primary alkanol in the presence of a strong acid esterification catalyst, and at a temperature between 80 DEG and 150 DEG C., and separating the unesterified acid from the reaction mixture. The primary alkanols used in the esterification contain from 4 to 10 carbon atoms, and preferably are those containing 7 to 9 carbon atoms whose iso. phthalic esters are useful as plasticizers, e.g. 1-octanol, 2 : 2 : 4-trimethyl pentanol, 2-ethyl hexanol and 2 : 2 : 4 : 4-tetra-methylpentanol. With the higher alkanols, inert hydrocarbon or halogenated hydrocarbon diluents of boiling-point above 70 DEG C. may be used, and serve to remove the water formed in the reaction by entrainment. The catalyst, present in a concentration of 0.1 to 1.0 per cent by weight, may be sulphuric, hydrochloric, phosphoric, or p-toluene sulphonic acid but sulphuric acid is preferred. The esterification is carried out by refluxing the reactants and removing the water which is formed, either as described above, or if lower alkanols are used, by entrainment in the alkanol itself. When the amount of water formed diminishes the esterification is assumed complete, and the residue, enriched in terephthalic acid, removed by filtering or centrifuging. In examples: (1) a mixture containing 28.1 per cent terephthalic acid gives a residue containing 89.5 per cent terephthalic acid after 21 hours reflux, and (2) a mixture containing 40 per cent terephthalic acid gives a residue containing 96.1 per cent terephthalic acid after 12.25 hours reflux.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3163252A GB727184A (en) | 1952-12-13 | 1952-12-13 | Separation of terephthalic acid |
FR1093080D FR1093080A (en) | 1952-12-13 | 1953-12-09 | Separation of terephthalic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3163252A GB727184A (en) | 1952-12-13 | 1952-12-13 | Separation of terephthalic acid |
Publications (1)
Publication Number | Publication Date |
---|---|
GB727184A true GB727184A (en) | 1955-03-30 |
Family
ID=10326073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3163252A Expired GB727184A (en) | 1952-12-13 | 1952-12-13 | Separation of terephthalic acid |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1093080A (en) |
GB (1) | GB727184A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3058997A (en) * | 1958-05-23 | 1962-10-16 | Richfield Oil Corp | Phthalic acid products purification |
US3230251A (en) * | 1962-01-31 | 1966-01-18 | Ethyl Corp | Separation of 4, 4'-bibenzoic acid from a mixture of carboxylic acids |
-
1952
- 1952-12-13 GB GB3163252A patent/GB727184A/en not_active Expired
-
1953
- 1953-12-09 FR FR1093080D patent/FR1093080A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3058997A (en) * | 1958-05-23 | 1962-10-16 | Richfield Oil Corp | Phthalic acid products purification |
US3230251A (en) * | 1962-01-31 | 1966-01-18 | Ethyl Corp | Separation of 4, 4'-bibenzoic acid from a mixture of carboxylic acids |
Also Published As
Publication number | Publication date |
---|---|
FR1093080A (en) | 1955-04-29 |
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