COMPOSITE POLYMERIC MEMBRANES FOR THE PREPARATION OF MIXTURES OF GASES AND THE METHOD FOR PREPARATION THE SAME

摘要

Composite polymeric membranes for the separation of mixture of gases and the method for preparation the same. The invention pertains to composite polymeric membranes for the separation of mixture of gases and to a method for their preparation. The membranes have higher selectivity in the separation of mixtures He/N2 and O2/N2, suitable mechanical properties and a high permeability. They consist of a microporous base based on aromatic polyimides of the general formula II or polyamidoimides of the general formula IV and a polymeric selective layer formed from poly-2,6-dimethyl-1,4-phenyleneoxide or it's derivatives of the general formula I. A method for the preparation of composite polymeric membranes according to the invention which consist in that on an in advance prepared and dried microporous polymeric base, being based on an aromatic polyimide of the formula II or a polyamidoimide of the formula IV, there is formed a thin polymeric selective layer being based on poly2,6-dimethyl-1,4-phenyleneoxide or it's derivatives of the formula I. The formulas are the following: General formula II General formula IV General formula I