Organosiloxane Films for Gas Separations
AssigneeApplied Membrane Technology, Inc.
InventorAshok K. Sharma
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Abstract
A semipermeable gas separation membrane is plasma deposited from liquid organosiloxane monomer having at least three silicon atoms and an alpha hydrogen atom. The semipermeable membrane may be employed as a gas-selective membrane in combination with a porous substrate.
Claims13
A semi permeable membrane for gas separations, said membrane comprising a polymer that is plasma polymerized from an aliphatic non-cyclic organosiloxane monomer having at least three silicon atoms and at least one alpha hydrogen atom bonded directly to a respective silicon atom, said membrane having a carbon dioxide gas flux of at least 0.5*10−3 cm3/cm2*sec*cm(Hg), and a carbon dioxide/oxygen selectivity of at least 1.5.
A gas separation module, comprising:
- a porous substrate;
- and
- a coating on said substrate, said coating being plasma deposited from an aliphatic non-cyclic organosiloxane having at least three silicon atoms and a hydrogen atom bonded directly to a respective silicon atom, said coating having a permeability to a first gas that is greater than its permeability to a second gas.
A method for coating a substrate to form a gas separation module, said method comprising:
- vaporizing a feed aliphatic non-cyclic organosiloxane monomer having at least three silicon atoms and at least two alpha-hydrogen atoms bonded to respective silicon atoms;
- and
- plasma polymerizing said aliphatic non-cyclic organosiloxane monomer for deposition onto the substrate as a coating, such that the coated substrate has a carbon dioxide gas flux of at least 0.5*10−3 cm3/cm2*sec*cm(Hg), and a carbon dioxide/oxygen selectivity of at least 1.5.
Dependencies are inferred from the claim text.