Continuous catalyzed vapor phase dimeric cyclic ester process
US5138074A · kind A · utility
23Cited by
3References
20Claims
0Family size
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Key dates
| Filing date | Jun 28, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jun 28, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D319/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A continuous catalyzed vapor phase process for the production of dimeric cyclic esters which comprises converting the corresponding alpha-hydroxy-carboxylic acid or ester in the vapor phase over a solid catalyst, such as a silica-alumina, preferably a silica-alumina having a high silica content, in the presence of a carrier of gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.