Separation of 2,3-butanediol from propylene glycol by azeotropic distillation
US4935102A · kind A · utility
25Cited by
5References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/82
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A complex mixture of polyols cannot be easily separated by atmospheric or reduced pressure distillation because of the closeness of their boiling points. A mixture of polyols can be readily separated by azeotropic distillation. Typical effective agents are: p-xylene for propylene glycol from 2,3-butanediol and 1,2-butanediol; diisobutyl ketone for ethylene glycol from 1,2-butanediol and 1,3-butanediol; dipentene for glycerine from triethylene glycol and 1,2,4-butanetriol; propylene glycol isobutyl ether for 2,3-butanediol from propylene glycol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.