GB768474A - Improvements in the production of aromatic carboxylic acids - Google Patents
Improvements in the production of aromatic carboxylic acidsInfo
- Publication number
- GB768474A GB768474A GB5998/55A GB599855A GB768474A GB 768474 A GB768474 A GB 768474A GB 5998/55 A GB5998/55 A GB 5998/55A GB 599855 A GB599855 A GB 599855A GB 768474 A GB768474 A GB 768474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nitric acid
- per cent
- oxidation
- diethylbenzene
- compounds
- 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
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/27—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with oxides of nitrogen or nitrogen-containing mineral acids
- C07C51/275—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with oxides of nitrogen or nitrogen-containing mineral acids of hydrocarbyl groups
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
Aromatic di-carboxylic acids are prepared by oxidizing di-alkylbenzenes with aqueous nitric acid in the presence of 1-3 per cent by weight of the oxidation solution of a compound of vanadium, chromium, manganese or iron, or of mixtures of such compounds. Compounds mentioned are manganese carbonate, manganese dioxide, alkali-metal permanganates, ferric nitrate and vanadyl sulphate. The oxidation may be effected by heating a mixture of aqueous nitric acid of a concentration of 10-50 per cent by weight and the metal compound or compounds to boiling, and adding the dialkyl benzene. The concentration of nitric acid in the mixture is maintained by continuously or periodically adding more highly concentrated nitric acid. After separation of the aromatic di-carboxylic acid product, the mother liquor may be used for further similar oxidations without further addition of metal compound. The process may be conducted in a continuous manner and under pressure and at raised temperatures. In examples: (1) p-diethylbenzene, 30 per cent nitric acid, and potassium permanganate are heated to boiling, further p-diethylbenzene and 98 per cent nitric acid being continually added during the reaction, and the precipitated terephthalic acid product is separated, the reaction liquors being used for a further similar oxidation with the addition of p-diethylbenzene and 98 per cent nitric acid; a similar oxidation omitting the potassium permanganate is described; (2) the oxidation of p-diisopropylbenzene with nitric acid in the presence of manganese carbonate, ferric nitrate and vanadyl sulphate to yield terephthalic acid is described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE768474X | 1954-03-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB768474A true GB768474A (en) | 1957-02-20 |
Family
ID=6673727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5998/55A Expired GB768474A (en) | 1954-03-02 | 1955-03-01 | Improvements in the production of aromatic carboxylic acids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB768474A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3227751A (en) * | 1961-06-09 | 1966-01-04 | Union Oil Co | Method of preparing trimellitic acid |
-
1955
- 1955-03-01 GB GB5998/55A patent/GB768474A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3227751A (en) * | 1961-06-09 | 1966-01-04 | Union Oil Co | Method of preparing trimellitic acid |
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