Multicomponent gas separation membranes having polyphosphazene coatings
First Claim
1. In a multicomponent membrane for gas separation comprising a coating in occluding contact with a porous separation membrane of material, which material exhibits selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of a gaseous mixture, said porous separation membrane having a substantial void volume, wherein, with respect to one pair of gases, the material of the porous separation membrane exhibits a determined intrinsic separation factor greater than the determined intrinsic separation factor of the material of said coating, and the multicomponent membrane exhibits a separation factor significantly greater than the determined intrinsic separation factor of material of said coating and greater than the separation factor exhibited by the porous separation membrane;
- the improvement comprising a polyphosphazene coating material having the formula;
##STR6## where R and R'"'"' are the same or different organic substituents and n is an integer of two or more, said polyphosphazene coating material swells no more than about 25% by volume when exposed to aliphatic and aromatic hydrocarbons contained in said gaseous mixture.
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Accused Products
Abstract
Multicomponent membranes for gas separation having polyphosphazene coatings in occluding contact with a porous separation membrane are disclosed which are effective for separating at least one gas from gaseous mixtures and which exhibit improved stability when exposed to aromatic and aliphatic hydrocarbons contained in the gaseous mixtures. In addition multicomponent membranes for gas separations having a polyphosphazene coating in occluding contact with a porous separation membrane of polar material are disclosed which exhibit relative preferential permeation of polar gases from mixtures containing polar and non-polar gases.
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Citations
13 Claims
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1. In a multicomponent membrane for gas separation comprising a coating in occluding contact with a porous separation membrane of material, which material exhibits selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of a gaseous mixture, said porous separation membrane having a substantial void volume, wherein, with respect to one pair of gases, the material of the porous separation membrane exhibits a determined intrinsic separation factor greater than the determined intrinsic separation factor of the material of said coating, and the multicomponent membrane exhibits a separation factor significantly greater than the determined intrinsic separation factor of material of said coating and greater than the separation factor exhibited by the porous separation membrane;
- the improvement comprising a polyphosphazene coating material having the formula;
##STR6## where R and R'"'"' are the same or different organic substituents and n is an integer of two or more, said polyphosphazene coating material swells no more than about 25% by volume when exposed to aliphatic and aromatic hydrocarbons contained in said gaseous mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- the improvement comprising a polyphosphazene coating material having the formula;
- 8. A multicomponent membrane for polar gas separations comprising a halogenated polyphosphazene coating in occluding contact with a porous separation membrane of polar material, said polar material exhibiting selective permeation for polar gases from gaseous mixtures, said polar porous separation membrane having a substantial void volume, wherein with respect to the polar gases of the porous separation membrane exhibits a determined intrinsic separation factor greater than the determined intrinsic separation factor of the halogenated polyphosphazene coating material, and the multicomponent membrane exhibits a separation factor significantly greater than the determined intrinsic separation factor of the polyphosphazene coating material and greater than the separation factor exhibited by the polar, porous separation membrane for polar gases.
Specification