Propylene oxide purification
US6024840A · kind A · utility
7Cited by
18References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1997 |
| Grant date | Feb 15, 2000 |
| Priority date | — |
| Expiry date | Aug 8, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D301/32
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to fractional distillation. The methanol solvent is utilized during such distillation to lower the relative volatility of the acetaldehyde impurity, thereby making it possible to obtain a bottoms fraction containing substantially all the acetaldehyde. Purified propylene oxide having a reduced acetaldehyde concentration is removed as an overhead stream. Water may also be effectively separated from the propylene oxide using this procedure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.