Recovery of ethylene glycol from butanediol isomers by azeotropic distillation
US4966658A · kind A · utility
29Cited by
5References
2Claims
0Family size
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Inventor
Key dates
| Filing date | Jul 5, 1990 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Jul 5, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/82
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Ethylene glycol cannot be easily separated from 1,2-butanediol or 1,3-butanediol by atmospheric or reduced pressure distillation because of the closeness of their boiling points. Ethylene glycol can be readily separated from the butanediols by azeotropic distillation. Typical effective agents are ethyl benzene, 3-heptanone or diisobutyl ketone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.