Polyparabanic acid membrane for selective separation
US5221482A · kind A · utility
2Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1991 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Jun 12, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An organic substance can be separated or concentrated by pervaporation or vapor permeation with a selective separation membrane comprising a polyparabanic acid consisting of recurring units of the general formula: ##STR1## wherein R represents a divalent organic group, a blend of the polyparabanic acid with a polymer having sulfonic acid groups, or a polyparabanic acid having sulfonic acid groups and mainly comprising recurring units of the above general formula (I).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.