Ammonium bisulfate catalyzed dehydration of beta-hydroxy acids
US9701610B2 · kind B2 · utility
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Key dates
| Filing date | Oct 14, 2014 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Oct 14, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J27/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Hydroxycarboxylic acids, e.g., 3-hydroxypropionic acid, and/or their ammonium salts are dehydrated to their corresponding unsaturated carboxylic acids, e.g., acrylic acid, by a process that uses a catalyst comprising ammonium bisulfate. The use of ammonium bisulfate reduces or eliminates the problems associated with processes that use sulfuric acid as a dehydrating catalyst, e.g, excess sulfuric acid consumption and/or recovery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.