Process for dehydration of condensation reaction mixtures obtained by azeotropic distillation
US5137605A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Oct 15, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C231/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the dehydration of substances, mixtures, primarily condensation reaction mixtures, (e.g. direct esterification, direct acetal formation, direct ketal formation), performed by continuous azeotropic distillation with an organic solvent forming with water an azeotropic mixture of minimal boiling point and unable to mix with water, carried out in such a way that the distillate is cooled at least to the temperature, at which the condensate with the given water content or the organic phase of the condensate is just supersaturated with respect to water, and the organic phase of lower water content obtained in this way is recycled to the distilling boiler. The organic solvents used are e.g. benzene, toluene, 1,2-dichloroethane, chloroform, carbon tetrachloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.