Crosslinked and crosslinkable hollow fiber membrane and method of making same
US6932859B2 · kind B2 · utility
30Cited by
43References
23Claims
0Family size
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Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Aug 23, 2005 |
| Priority date | — |
| Expiry date | Dec 30, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composition of and a method of making high performance hollow fiber membranes is described. The membranes have a high resistance to plasticization by use of a predetermined amount of crosslinking. The preferred polymer material for the membrane is a polyimide polymer comprising covalently bonded ester crosslinks. The resultant hollow fiber membrane exhibits a high permeability of CO2 in combination with a high CO2/CH4 selectivity. Another embodiment provides a method of making the hollow fiber membrane from a monesterified polymer followed by final crosslinking after hollow fiber formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.