Gas separation: apparatus – Apparatus for selective diffusion of gases – Hollow fiber or cylinder
Reexamination Certificate
2005-08-23
2005-08-23
Spitzer, Robert H. (Department: 1724)
Gas separation: apparatus
Apparatus for selective diffusion of gases
Hollow fiber or cylinder
C096S014000, C055S524000, C055SDIG005
Reexamination Certificate
active
06932859
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 CO2in combination with a high CO2/CH4selectivity. 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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Koros William J.
Miller Stephen J.
Staudt-Bickel Claudia
Wallace David
Wind John D.
Chevron USA Inc
Spitzer Robert H.
Tuck D. M.
University of Texas System
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