Thermally, heat and chemically resistant ultrafiltration polyimide membrane and method for its production

−4 L3 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)·10cm/sec atm and nominal molecular weight cutoff M=(5−500)·10g/mol, and method for producing an ultrafiltration membrane as disclosed.