GB719446A - Production of fumaric acid - Google Patents
Production of fumaric acidInfo
- Publication number
- GB719446A GB719446A GB32838/52A GB3283852A GB719446A GB 719446 A GB719446 A GB 719446A GB 32838/52 A GB32838/52 A GB 32838/52A GB 3283852 A GB3283852 A GB 3283852A GB 719446 A GB719446 A GB 719446A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chlorine
- maleic acid
- acid
- production
- fumaric acid
- 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
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
- C07C51/353—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by isomerisation; by change of size of the carbon skeleton
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The catalytic conversion of aqueous impure solutions of maleic acid is effected by heating in the presence of chlorine. The solutions employed are those obtained as by-products in the production of maleic anhydride by the catalytic oxidation of hydrocarbons, e.g. benzene and in the production of phthalic anhydride by the oxidation of naphthalene. Hydrochloric acid is the preferred catalyst but iodine, bromine, hydrochloric, hydrobromic and sulphuric acids, potassium thiocyanate and sodium bromide are mentioned. The reaction mixture should contain 2 to 6 mols. of water per mol. of maleic acid and 0.05 to 0.08 mol. of hydrogen chloride per mol. of water. Based on the weight of maleic acid, 1 to 3 per cent of chlorine is passed into the mixture at elevated temperature, when the fumaric acid is precipitated. In order to obtain white crystals of fumaric acid, the crude aqueous maleic acid is heated with chlorine and activated carbon during the preliminary step of concentration and the passage of chlorine continued during the isomerization at reflux temperature. Examples are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US719446XA | 1951-12-29 | 1951-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB719446A true GB719446A (en) | 1954-12-01 |
Family
ID=22104585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32838/52A Expired GB719446A (en) | 1951-12-29 | 1952-12-29 | Production of fumaric acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB719446A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1101754A2 (en) * | 1999-11-22 | 2001-05-23 | DSM Fine Chemicals Austria Nfg GmbH & Co KG | Method for the reduction of sulphur-containing, nitrification-inhibiting compounds |
-
1952
- 1952-12-29 GB GB32838/52A patent/GB719446A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1101754A2 (en) * | 1999-11-22 | 2001-05-23 | DSM Fine Chemicals Austria Nfg GmbH & Co KG | Method for the reduction of sulphur-containing, nitrification-inhibiting compounds |
| EP1101754A3 (en) * | 1999-11-22 | 2003-01-22 | DSM Fine Chemicals Austria Nfg GmbH & Co KG | Method for the reduction of sulphur-containing, nitrification-inhibiting compounds |
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