Crosslinked and crosslinkable hollow fiber membrane and method of making same utility
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United States of America Patent
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Jul 24, 2007
Grant Date -
Dec 8, 2005
app pub date -
Jun 10, 2005
filing date -
Dec 20, 2001
priority date (Note) -
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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 CO.sub.2 in combination with a high CO.sub.2/CH.sub.4 selectivity. Another embodiment provides a method of making the hollow fiber membrane from a monesterified polymer followed by final crosslinking after hollow fiber formation.
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