▎ 摘　　要

NOVELTY - Method for preparing inorganic-organic composite gel film comprises (i) using 5-aminoisophthalic acid as the organic ligand, using cobalt nitrate hexahydrate as the metal precursor, using dimethylformamide and deionized water as the solvent, ultrasonically mixing, placing in a reaction kettle for reaction and reacting to obtain mixed solution A, (ii) treating with concentrated nitric acid, dispersing the graphene nanosheets in deionized water, adding a solution of cobalt nitrate hexahydrate, adding urea, ultrasonically mixing, stirring and reacting, centrifuging to obtain solid of the reaction solution, re-dispersing in deionized water, adding the polymer monomer, initiator and crosslinking agent, and polymerizing to prepare mixed solution B, and (iii) pre-treating the polyacrylonitrile membrane, entering into the mixed solution B for immersion treatment, taking out and drying and placing in the mixed solution A for immersion treatment. USE - The method is useful for preparing inorganic-organic composite gel film. ADVANTAGE - The film has good mechanical properties, good thermal stability, large flux and good separation effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for use method of film in the separation of hydrocarbon mixtures, comprising placing the hydrocarbon mixture in the feed liquid tank, using a constant temperature water bath for heating at 75-85 degrees C, adopting inorganic-organic composite gel membrane for pervaporation and separation by membrane module and condensing and collecting the permeated steam on the underside of the membrane in cold hydrazine.