Hydrocarboxylation of aqueous formaldehyde using a dehydrating recycle stream to decrease water concentration
US9040748B2 · kind B2 · utility
5Cited by
73References
17Claims
0Family size
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Key dates
| Filing date | Jun 8, 2012 |
| Grant date | May 26, 2015 |
| Priority date | — |
| Expiry date | Jun 11, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/149
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a process for the production and purification of glycolic acid or glycolic acid derivatives by the carbonylation of aqueous formaldehyde. The water in the hydrocarboxylation zone is reduced via reaction with the ester bonds in a recycle stream comprising glycolic acid oligomers and/or methyl glycolate oligomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.