GB898557A - Process for the manufacture of terephthalic acid and isophthalic acid - Google Patents
Process for the manufacture of terephthalic acid and isophthalic acidInfo
- Publication number
- GB898557A GB898557A GB3163358A GB3163358A GB898557A GB 898557 A GB898557 A GB 898557A GB 3163358 A GB3163358 A GB 3163358A GB 3163358 A GB3163358 A GB 3163358A GB 898557 A GB898557 A GB 898557A
- Authority
- GB
- United Kingdom
- Prior art keywords
- meta
- benzenes
- para
- acetyl
- oxygen
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/33—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties
- C07C45/34—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties in unsaturated compounds
- C07C45/36—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties in unsaturated compounds in compounds containing six-membered aromatic rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/81—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
- C07C45/82—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural 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 manufacture of terephthalic and isophthalic acids from a mixture of para-and meta-diethyl benzenes consists in forming para- and meta-di-acetyl benzenes by oxidation of the said mixture in liquid phase using oxygen or a gas containing oxygen in the presence of an oxidation catalyst such as lead, cobalt or manganese stearate, at increased temperature to form the isomeric di-acetyl benzenes and then separating same into the para- and meta-di-acetyl benzenes and converting each isomer independently by a further oxidation process into terephthalic or isophthalic acid with oxygen in the presence of organic solvents and oxidation catalyst. The para-di-acetyl benzene crystallises from the meta-diacetyl benzene which is liquid and separation may be effected by a centrifugal or pressure filtration process. Aliphatic or aromatic aldehydes may be used as oxidation initiators. In the example industrial diethyl benzene is oxidised with oxygen at normal pressure at 110 DEG C.-130 DEG C. in the presence of cobalt stearate, mixed diacetyl benzenes are obtained by fractionating the products, cooled to about 10 DEG C. and separated by filtration into para- and meta-isomers which are then oxidised in the presence of acetic acid, cobalt and manganese acetates and benzaldehyde to tere- and isophthalic acids.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEV0014677 | 1958-07-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB898557A true GB898557A (en) | 1962-06-14 |
Family
ID=7574680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3163358A Expired GB898557A (en) | 1958-07-09 | 1958-10-03 | Process for the manufacture of terephthalic acid and isophthalic acid |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1072614B (en) |
| GB (1) | GB898557A (en) |
-
0
- DE DENDAT1072614D patent/DE1072614B/en active Pending
-
1958
- 1958-10-03 GB GB3163358A patent/GB898557A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1072614B (en) | 1960-01-07 |
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