GB782291A - Process for the production of terephthalic acid - Google Patents
Process for the production of terephthalic acidInfo
- Publication number
- GB782291A GB782291A GB7673/55A GB767355A GB782291A GB 782291 A GB782291 A GB 782291A GB 7673/55 A GB7673/55 A GB 7673/55A GB 767355 A GB767355 A GB 767355A GB 782291 A GB782291 A GB 782291A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxide
- potassium
- lead
- phthalate
- diphenyl
- 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
- C07C51/41—Preparation of salts of carboxylic acids
- C07C51/416—Henkel reaction and related reactions, i.e. rearrangement of carboxylate salt groups linked to six-membered aromatic rings, in the absence or in the presence of CO or CO2, (e.g. preparation of terepholates from benzoates); no additional classification for the subsequent hydrolysis of the salt groups has to be given
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Terephthalic acid is made by heating in the presence of an organic diluent which is liquid at the reaction temperature either potassium isoor ortho-phthalate, or a mixture thereof, at 350-480 DEG , preferably 420-480 DEG , especially 440 DEG C., under pressure in a carbon dioxide atmosphere. Pressures of 70-150 atmos. are quoted. The starting material may be obtained by converting into neutral salts the oxidation products of commercial xylenes, any potassium carbonate present being preferably converted to the sulphate. Advantageously the phthalates are anhydrous. Sufficient diluent should be present to form a mobile paste. Specified diluents are diphenyl, phenyl cresyl oxide, dicresyl oxide and diphenyl oxide, the latter being preferred. The use of a catalyst such as an oxide of zinc, iron, thallium or lead, or of an organic salt of lead such as the oxalate, leads to an increased yield, litharge being preferred. 1 to 6 per cent by weight of catalyst based on phthalate may be used. In examples terephthalic acid is obtained in the presence of diphenyl oxide and lead oxalate from (1) potassium ortho-phthalate; (2) potassium isophthalate; and (3) a mixture of potassium salts from acids obtained by oxidizing commercial xylene and in (4) from potassium isophthalate in the presence of diphenyl oxide and lead oxide. Reference has been directed by the Comptroller to Specifications 747,204 and 762,644.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1006413X | 1954-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB782291A true GB782291A (en) | 1957-09-04 |
Family
ID=9565737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7673/55A Expired GB782291A (en) | 1954-05-28 | 1955-03-16 | Process for the production of terephthalic acid |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE538382A (en) |
| DE (1) | DE1006413B (en) |
| FR (2) | FR1105556A (en) |
| GB (1) | GB782291A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE936036C (en) * | 1952-11-21 | 1955-12-01 | Henkel & Cie Gmbh | Process for the preparation of terephthalic acid |
-
0
- BE BE538382D patent/BE538382A/xx unknown
-
1954
- 1954-05-28 FR FR1105556D patent/FR1105556A/en not_active Expired
- 1954-12-29 FR FR67380D patent/FR67380E/en not_active Expired
-
1955
- 1955-03-16 GB GB7673/55A patent/GB782291A/en not_active Expired
- 1955-05-24 DE DES44064A patent/DE1006413B/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BE538382A (en) | |
| DE1006413B (en) | 1957-04-18 |
| FR67380E (en) | 1958-03-06 |
| FR1105556A (en) | 1955-12-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB747204A (en) | Process for the production of terephthalic acid or derivatives thereof from phthalic acid | |
| US3651127A (en) | Process for the manufacture of phenyl esters or mixtures of phenyl esters and phenol from benzene | |
| GB784248A (en) | Improvements in the preparation of high quality dimethyl terephthalate | |
| GB782291A (en) | Process for the production of terephthalic acid | |
| ES8100017A1 (en) | Process for the production of overbased manganese salts of organic acids | |
| GB744721A (en) | Process for the manufacture of salts or other derivatives of aromatic dicarboxylic acids, especially of terephthalic acid | |
| GB723454A (en) | Improvements in or relating to the manufacture of hydroquinone | |
| US2881215A (en) | Nitric acid oxidation of cyclic alcohols | |
| GB747417A (en) | Improvements in or relating to the production of phthalic acids | |
| GB1454728A (en) | Process for the preparation of 2-nitrobenzaldehyde | |
| SU137514A1 (en) | The method of obtaining terephthalic acid | |
| GB786747A (en) | Improvements in and relating to the production of aromatic di-carboxylic acids | |
| GB772410A (en) | A process for preparing aliphatic dicarboxylic acids and the resulting acids | |
| GB762644A (en) | Process for the production of terephthalic acid and derivatives thereof | |
| US1945267A (en) | Contact sulphuric acid process | |
| GB697776A (en) | Process for the preparation of cumene hydroperoxide | |
| GB871836A (en) | Improvements in or relating to methods of synthesizing 2, 4, 4, 4-tetrachloro-butyric acid | |
| GB756472A (en) | A process for converting naphthalic acid into naphthalene-2.6-dicarboxylic acid | |
| GB1363909A (en) | Process for the production of pyridine carboxylic | |
| US3080414A (en) | Ketocycloaliphatic nitrates | |
| GB1079112A (en) | Process for the production of alkali-metal disalts of aromatic dicarboxylic acids | |
| GB855880A (en) | Production of alpha hydroxyisobutyric acid | |
| GB774835A (en) | Process for the preparation of terephthalic acid | |
| GB981283A (en) | A method for the manufacture of para-(ª‰-hydroxyethoxy) benzoic acid | |
| GB782817A (en) | Process for the manufacture of terephthalic acid |