Process for obtaining maleic acid anhydride
US4191695A · kind A · utility
3Cited by
3References
33Claims
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Key dates
| Filing date | Apr 12, 1977 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | Apr 12, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09H9/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for obtaining maleic acid anhydride from an aqueous maleic acid solution obtained from the gas phase oxidation of at least one organic compound having at least 4 carbon atoms by washing out the reaction gases with water, characterized in that a H.sub.2 O exchange is carried out between maleic acid and an organic carboxylic acid anhydride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.