Process for separating ethylene oxide from aqueous solutions
US4437939A · kind A · utility
15Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1981 |
| Grant date | Mar 20, 1984 |
| Priority date | — |
| Expiry date | Nov 16, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D301/32
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Ethylene oxide is extracted from aqueous solutions by carbon dioxide under (near) super-critical conditions and thereafter recovered by distillation at sub-critical conditions. Improved distillation is obtained by adding to the carbon dixoide a gas (or gases) which adjust the critical temperature of the gas mixture of the top of the distillation column within the range of about 32.degree. C. to about 75.degree. C. Preferred gases are the saturated hydrocarbons, particularly propane, n-butane, isobutane and pentane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.