Hydrogen-selective silica-based membrane
AssigneesConoco Inc., Virginia Polytechnic Institute and State University
InventorsShigeo Ted Oyama, Lixiong Zang, Doohwan Lee, Doug S. Jack
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Abstract
A hydrogen permselective membrane, a method of forming a permselective membrane and an apparatus comprising a permselective membrane, a porous substrate and an optional intermediate layer are described. Using chemical vapor deposition (CVD) at low reactant gas concentration, high permselectivities are achieved with minimal reduction in hydrogen permeance.
Claims75
A permselective asymmetric membrane comprising a porous surface layer and a porous substrate layer wherein said porous surface layer is deposited by the chemical vapor deposition of a CVD reactant gas having a concentration of about 0.112 mole/m3 or less in a CVD gas stream.
A permselective asymmetric membrane comprising a porous surface layer, one or more porous intermediate layers and a porous substrate layer wherein said porous surface layer and at least one porous intermediate layer are deposited by chemical vapor deposition of a CVD reactant gas in a CVD gas stream.
A method for preparing a permselective asymmetric membrane comprising depositing a porous surface layer and one or more porous intermediate layers on a porous substrate layer wherein the porous substrate layer and at least one of the one or more porous intermediate layers are deposited by chemical vapor deposition using a CVD reactant gas.
A permselective asymmetric membrane comprising a porous surface layer and a porous substrate layer, said membrane having a permeance of at least 5×10−8 mol/m2·s·Pa for a desired permeate and a permselectivity of at least 100 for the desired permeate relative to one or more undesired permeates.
A permselective asymmetric membrane comprising a porous surface layer and a porous substrate layer, said membrane having a permeance of at least 1×10−7 mol/m2·s·Pa for a desired permeate and a permselectivity of at least 300 for the desired permeate relative to one or more undesired permeates.
Dependencies are inferred from the claim text.