Method for separating gas-liquid/liquid mixtures through pervaporation and vapor permeation by ion-exchange SAPO-34 molecular sieve membrane

The invention discloses a method for separating gas-liquid/liquid mixtures through pervaporation and vapor permeation by an ion-exchange SAPO-34 molecular sieve membrane. The method comprises the steps: (1) synthesizing an SAPO-34 molecular sieve seed crystal; (2) coating the internal surface of a porous support with the SAPO-34 molecular sieve seed crystal; (3) synthesizing an SAPO-34 molecular sieve membrane; (4) carrying out ion exchange and roasting; and (5) separating the gas-liquid mixtures or liquid mixtures by using the ion-exchange SAPO-34 molecular sieve membrane prepared in the step (4) by adopting a pervaporation separation process or vapor permeation separation process. Methanol and dimethyl carbonate are separated by a membrane method, so that the method has the advantages that the energy consumption is low, constraints caused by azeotropes are absent, the flux of methanol is high, the separation coefficient is big, and the like, thereby having a great economic value.