Hollow fiber acidproof and permeable molecular sieve membrane and its preparation method

The invention relates to a hollow fiber acidproof and permeable molecular sieve membrane and its preparation method. The hollow fiber acidproof and permeable molecular sieve membrane is characterized by taking hollow fiber porous ceramic as the support body and a T-type molecular sieve membrane as the membrane layer. The method comprises the steps of: mixing a silicon source, an aluminum source, sodium hydroxide, potassium hydroxide and water uniformly in proportion, conducting stirring for aging so as to obtain a reaction solution; putting a hollow fiber porous ceramic support body with a precoated T-type molecular sieve crystal seed into a reaction vessel, adding the reaction solution for hydrothermal synthesis; after the reaction, taking out the membrane and washing it to pH of 7-10, and drying it, thus obtaining a hollow fiber acidproof and permeable molecular sieve membrane. The T-type molecular sieve membrane of the invention is in a hollow fiber shape, and has a filling area over 1000m .m , which is far higher than the filling area (30-250m .m ) of a single-channel tubular membrane. Besides, the hollow fiber porous ceramic support body has a thin wall, thus being in favor of reducing the support body mass transfer resistance and improving the pervaporation flux.