Separation of propylene glycol from 1,2-butanediol by azeotropic
US5423955A · kind A · utility
29Cited by
4References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1994 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Jul 5, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C31/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Propylene glycol is difficult to separate from 1,2-butanediol by conventional distillation or rectification because of the proximity of their boling points. Propylene glycol can be readily separated from 1,2-butanediol by azeotropic distillation. Effective agents are 2,2-dimethyl butane, 3-carene and diethyl benzene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.