Method for production of maleic anhydride
US6960670B2 · kind B2 · utility
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2References
2Claims
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Assignee
Inventors
Key dates
| Filing date | Jun 19, 2002 |
| Grant date | Nov 1, 2005 |
| Priority date | — |
| Expiry date | Jun 28, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention discloses a method for producing maleic anhydride comprising an azeotropic distillation step to dehydrate a crude maleic acid-containing aqueous solution, which method is characterized by as an azeotropic solvent (1) using an organic solvent exhibiting a maximum dissolving concentration of the organic solvent in water in the range of 0.1-5% by weight at a temperature of 20° C. According to this invention, it is made possible to prevent the occurrence of a blocking substance, allow a continuous operation for a long time, and remove by-produced acid components by a process of distillation for azeotropic dehydration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.