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OwnerGalina A. Polotskaya, Tamara K. Meleshko +2inventors
InventorsGalina A. Polotskaya, Tamara K. Meleshko, Alexandr E. Polotsky, Andrey N. Cherkasov
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A thermally, heat and chemically stable polyimide asymmetric ultrafiltration membrane, is a porous film or a hollow fiber, having an anisotropic structure a selective surface layer and a substrate, wherein the selective ultraporous surface layer has size of pores 70-800 Å with thickness 0.1-10 mcm and is composed of insoluble rigid-chain aromatic (co)polyimide based on dianhydride of aromatic tetracarbonic acid and aromatic diamine and located on the microporous substrate with thickness 50-250 mcm, and the membrane has water permeability Q=(2-500)·10−4 cm/sec atm and nominal molecular weight cutoff ML=(5-500)·103 g/mol, and method for producing an ultrafiltration membrane as disclosed.
A thermally, heat and chemically stable asymmetric ultrafiltration polyimide membrane, comprising a porous film or a hollow fiber having anisotropic structure and includes a selective surface layer and a substrate, wherein the selective surface layer has pore sizes of between about 70 and about 800 Å with thickness of about 0.1 and about 10 mcm and is comprised of insoluble rigid-chain aromatic (co)polyimide based on dianhydride of aromatic tetracarbonic acid and aromatic diamine and located on a microporous substrate with thickness of between about 50 and about 250 mcm, and the membrane has water permeability (Q) from Q=80·10−4 cm/sec atm to Q=320·10−4 cm/sec atm and nominal molecular weight cutoff ML=(5-500)·103 g/mol.
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Dependencies are inferred from the claim text.