Separation membranes prepared from polyamide polymers having 2,2'-bis (trifluoromethyl) biphenyl units and a process of separating gaseous mixtures using them
US5922104A · kind A · utility
16Cited by
21References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Nov 10, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention provides a polyamide separation membrane, prepared from high molecular weight polyamide having a repeating unit represented by the formula (I) and a process for separating gaseous mixtures using them. ##STR1## wherein, R is an aliphatic or aromatic organic group derived from dicarboxylic acid or halide. The polyamide separation membrane according to the present invention has a large free volume and good permeation properties such as permeability and permeation selectivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.