Recovery of alkylene glycols by azeotropic distillation
US4151048A · kind A · utility
4Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Jun 6, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/82
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Ethylene glycol or 1,2-propylene glycol contained in mixtures with lower carboxylate esters of glycol, e.g. as produced by hydrolysis of the esters, is recovered by distillation of the mixtures with a hydrocarbon forming a minimum boiling azeotrope with the ethylene dlycol or 1,2-propylene glycol, the hydrocarbon being maintained in an inert atmosphere in the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.