GB826236A - Improvements in or relating to the separation of mixtures of benzene carboxylic acids - Google Patents
Improvements in or relating to the separation of mixtures of benzene carboxylic acidsInfo
- Publication number
- GB826236A GB826236A GB7579/56A GB757956A GB826236A GB 826236 A GB826236 A GB 826236A GB 7579/56 A GB7579/56 A GB 7579/56A GB 757956 A GB757956 A GB 757956A GB 826236 A GB826236 A GB 826236A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- isophthalic
- separating
- orthophthalic
- separation
- 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
- C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
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
The invention comprises a process for separating isophthalic and terephthalic acid from a mixture containing these acids, with or without orthophthalic acid and/or benzoic acid, which comprises digesting the mixture at a temperature of 85-200 DEG C. with an acetic acid solvent and separating the extract isophthalic acid solution from the undissolved solid terephthalic acid at temperatures in excess of 50 DEG C., the amount of acetic acid solvent empolyed being sufficient to dissolve the isophthalic acid present, at the temperature of separation. The isophthalic acid may then be recovered by cooling the extract solution, e.g. at 0-45 DEG C. and separating off precipitated isophthalic acid. Any orthophthalic or benzoic acid present may be separated during the preliminary digestion or from the final filtrate and the orthophthalic acid may be dehydrated in the presence of e.g. acetic acid, formic acid, carbon disulphide or benzene, to form phthalic anhydride. The first filtrate may also be treated with activated carbon prior to cooling. Examples are given. Specification 807,091 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US826236XA | 1955-03-21 | 1955-03-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB826236A true GB826236A (en) | 1959-12-31 |
Family
ID=22172322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7579/56A Expired GB826236A (en) | 1955-03-21 | 1956-03-12 | Improvements in or relating to the separation of mixtures of benzene carboxylic acids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB826236A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022033735A1 (en) * | 2020-09-11 | 2022-02-17 | Rittec Umwelttechnik Gmbh | Process for preparing a mixture of recycled terephthalic acid and isophthalic acid |
-
1956
- 1956-03-12 GB GB7579/56A patent/GB826236A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022033735A1 (en) * | 2020-09-11 | 2022-02-17 | Rittec Umwelttechnik Gmbh | Process for preparing a mixture of recycled terephthalic acid and isophthalic acid |
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