Treatment of impurity-containing liquid streams in ethylene oxide/glycol processes with semi-permeable membranes
US5034134A · kind A · utility
13Cited by
6References
77Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D301/32
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is disclosed for separating impurity components, UV absorbers and/or UV absorber precursors contained in an ethylene glycol-water stream thereby desirably allowing the recovery of the glycols contained in such stream in an economical and efficient manner. Specifically, these undesirable components are separated by contacting the ethylene glycol-water stream with a suitable semi-permeable membrane to effect such separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.