GB908736A - Improvements in the production of terephthalic acid - Google Patents
Improvements in the production of terephthalic acidInfo
- Publication number
- GB908736A GB908736A GB2006660A GB2006660A GB908736A GB 908736 A GB908736 A GB 908736A GB 2006660 A GB2006660 A GB 2006660A GB 2006660 A GB2006660 A GB 2006660A GB 908736 A GB908736 A GB 908736A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxygen
- bromide
- oxidation
- acids
- cobalt
- 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
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl 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
A process for the production of terephthalic acid by oxidising first in the liquid phase a para-dialkyl-benzene having at least two carbon atoms in each alkyl radical or an intermediate oxidation product thereof in the presence of a salt of cobalt, manganese, barium or lead which is soluble in said paradialkyl benzene as catalyst, with oxygen at a temperature between about 100 DEG and 170 DEG C., dissolving the resultant oxidation product in a solvent inert to oxygen, continuing the oxidation with oxygen at temperatures between 120 DEG and 200 DEG C. under a pressure of about 3 to 50 atmospheres absolute until the absorption of oxygen has ended and then after adding bromine or a bromine compound, leading the oxidation to its conclusion with oxygen at temperatures between 150 and 200 DEG C. and pressures of about 3 to 50 atmospheres absolute. Starting materials specified include p-diethyl-, di-n-propyl-, di-iso-propyl-, di-n-butyl- or di-iso-butyl-benzene and the corresponding mixed dialkyl benzenes e.g. p-ethylpropyl-benzenes. Intermediate oxidation products specified include p-cumic-, and p-a -dihydroxycumic acids, a ,a 1-dihydroxy-1,4-diethylbenzene, p-ethylbenzoic acid, p-diacetylbenzene and p-acetyl-benzoic acid. Salts of cobalt, manganese, barium and lead with higher fatty or naphthenic acids e.g. octenates and naphthenates may be used as catalysts. Oxidation initiators which may be employed include tetraethyl lead and inorganic and organic peroxides and include sodium, potassium or barium peroxide, benzoyl peroxide, perbenzoic and peracetic acids, substances forming peroxides under the reaction conditions e.g. aldehydes, ketones, ethers and olefines, several of which are specified, and ozone. Solvents specified include aliphatic and araliphatic carboxylic acids, diphenyl, diphenyl ethers, chlorbenzenes, chlorpolyphenyls and naphthalene. Bromine compounds specified include hydrogen bromide and its salts, e.g. ammonium, cobalt and manganese bromide, potassium bromate, xylylene dibromide, benzyl bromide, ethylene bromide, bromoform, cyclohexyl bromide and bromacetaldehyde. Examples are furnished. Specification 807,091 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEC19957A DE1106751B (en) | 1959-10-13 | 1959-10-13 | Process for the preparation of terephthalic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB908736A true GB908736A (en) | 1962-10-24 |
Family
ID=7016718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2006660A Expired GB908736A (en) | 1959-10-13 | 1960-06-08 | Improvements in the production of terephthalic acid |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1106751B (en) |
| GB (1) | GB908736A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3406196A (en) * | 1964-09-30 | 1968-10-15 | Du Pont | Oxidation of polyalkyl aromatics to polycarboxylic acids |
| US3431296A (en) * | 1963-10-10 | 1969-03-04 | Teijin Ltd | Process for preparation of high purity terephthalic acid |
| US3974214A (en) * | 1974-02-27 | 1976-08-10 | Atlantic Richfield Company | Isophthalic acid manufacture |
| US4755622A (en) * | 1983-12-29 | 1988-07-05 | Amoco Corporation | Process for the production of trimellitic acid and pyromellitic acid by staged bromine addition in an oxidation of polyalkylaromatics |
| CN112479861A (en) * | 2020-12-10 | 2021-03-12 | 成家钢 | Liquid-phase normal-pressure catalytic oxygen oxidation safety method and oxygen oxidation safety reaction equipment |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB983677A (en) * | 1962-04-27 | 1965-02-17 | Mitsui Petrochemical Ind | A process for the preparation of terephthalic acid having extremely high purity |
| DE1270030C2 (en) * | 1962-04-27 | 1973-07-19 | METHOD FOR PURIFYING TEREPHTHALIC ACID |
-
1959
- 1959-10-13 DE DEC19957A patent/DE1106751B/en active Pending
-
1960
- 1960-06-08 GB GB2006660A patent/GB908736A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3431296A (en) * | 1963-10-10 | 1969-03-04 | Teijin Ltd | Process for preparation of high purity terephthalic acid |
| US3406196A (en) * | 1964-09-30 | 1968-10-15 | Du Pont | Oxidation of polyalkyl aromatics to polycarboxylic acids |
| US3974214A (en) * | 1974-02-27 | 1976-08-10 | Atlantic Richfield Company | Isophthalic acid manufacture |
| US4755622A (en) * | 1983-12-29 | 1988-07-05 | Amoco Corporation | Process for the production of trimellitic acid and pyromellitic acid by staged bromine addition in an oxidation of polyalkylaromatics |
| CN112479861A (en) * | 2020-12-10 | 2021-03-12 | 成家钢 | Liquid-phase normal-pressure catalytic oxygen oxidation safety method and oxygen oxidation safety reaction equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1106751B (en) | 1961-05-18 |
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