GB994414A - Production of benzoic acid - Google Patents
Production of benzoic acidInfo
- Publication number
- GB994414A GB994414A GB2655361A GB2655361A GB994414A GB 994414 A GB994414 A GB 994414A GB 2655361 A GB2655361 A GB 2655361A GB 2655361 A GB2655361 A GB 2655361A GB 994414 A GB994414 A GB 994414A
- Authority
- GB
- United Kingdom
- Prior art keywords
- benzoic acid
- liquid
- oxidation
- monoalkylbenzene
- reaction mixture
- 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)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
The invention comprises a continuous process for the production of benzoic acid by the catalytic, liquid-phase oxidation of a monoalkylbenzene with molecular oxygen in the presence of benzoic acid carried out in an adiabatic oxidation zone wherein a liquid phase consisting of a solution of the monoalkylbenzene and benzoic acid containing a heavy metal oxidation catalyst is maintained, which process includes the steps of continuously adding the monoalkylbenzene and benzoic acid to the oxidation zone to produce a liquid reaction mixture containing benzoic acid and the monoalkylbenzene in a weight ratio of 0.2: 1 to 2.5: 1, withdrawing liquid reaction mixture from the oxidation zone circulating the withdrawn reaction mixture in indirect heat exchange with a coolant to a temperature not below the initiation oxidation temperature, recycling the cooled liquid to the oxidation zone, removing from the circulating liquid a minor proportion thereof, crystallizing benzoic acid from the minor portion of the withdrawn reaction mixture, and recovering benzoic acid from the resulting slurry. The minor portion may be removed from the circulating liquid before or after removal of heat of reaction. The treatment of the minor portion of the withdrawn reaction mixture for the crystallization of benzoic acid depends on the benzoic acid concentration. Dilute streams are concentrated by evaporation of monoalkylbenzene to provide a concentrate containing 40% to 60% benzoic acid from which benzoic acid is crystallized. Reactor effluents containing high concentrations of benzoic acid, e.g. above 50% by weight, are charged to a contacting-crystallizing zone which is charged with aqueous benzoic acid, and which is adapted to receive the gasiform products of the oxidation reaction as well as the liquid effluent therefrom. The contacting-crystallizing zone is provided with means to separate unconverted monoalkylbenzene as a liquid phase which is recycled to the oxidation zone. The benzoic acid slurry resulting from either of these alternatives is separated into solid product and mother liquor. Mother liquor, toluene with dissolved benzoic acid, is recycled to the oxidation zone. Specifications 810,020 and 835,753 are referred to.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4453360A | 1960-07-22 | 1960-07-22 | |
| US57709A US3210416A (en) | 1960-09-22 | 1960-09-22 | Manufacture of benzoic acid from toluene |
| US87449A US3163671A (en) | 1961-02-06 | 1961-02-06 | Benzoic acid recovery by contacting gasiform and liquid effluents of liquid phase oxidation with saturated aqueous benzoic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB994414A true GB994414A (en) | 1965-06-10 |
Family
ID=27366502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2655361A Expired GB994414A (en) | 1960-07-22 | 1961-07-21 | Production of benzoic acid |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1443152B2 (en) |
| GB (1) | GB994414A (en) |
| NL (2) | NL267380A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2636489B1 (en) * | 1976-08-13 | 1977-12-08 | Bayer Ag | PROCESS FOR THE PRODUCTION OF SODIUM BENZOATE |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014119493A1 (en) | 2014-12-23 | 2016-06-23 | Duravit Aktiengesellschaft | WC |
-
0
- NL NL136045D patent/NL136045C/xx active
- NL NL267380D patent/NL267380A/xx unknown
-
1961
- 1961-07-21 GB GB2655361A patent/GB994414A/en not_active Expired
- 1961-07-22 DE DE19611443152 patent/DE1443152B2/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2636489B1 (en) * | 1976-08-13 | 1977-12-08 | Bayer Ag | PROCESS FOR THE PRODUCTION OF SODIUM BENZOATE |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1443152A1 (en) | 1969-01-09 |
| NL267380A (en) | |
| DE1443152B2 (en) | 1973-02-15 |
| DE1443152C3 (en) | 1973-09-20 |
| NL136045C (en) |
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