COMPOSITE SEPARATION MEMBRANE, SEPARATION MEMBRANE MODULE, SEPARATION DEVICE, COMPOSITION FOR FORMING SEPARATION MEMBRANE, AND METHOD FOR PRODUCING COMPOSITE SEPARATION MEMBRANE

摘要

Provided are a composite separation membrane comprising a porous supporting layer and a separation layer that is disposed on the porous supporting layer and has polymer a1 and polymer b1 as described below, a separation membrane module, a separation device, a composition for forming a membrane suitable for preparing the composite separation membrane, and a method for producing a composite separation membrane using the composition. Polymer a1: a polymer in which the ratio of the permeation speed of carbon dioxide to that of methane is 15 or more, the permeation speed of carbon dioxide is lower than that of the polymer b1, and the solubility parameter is 21 or more. Polymer b1: a polymer in which the permeation speed of carbon dioxide is 200 GPU or more, the ratio of the permeation speed of carbon dioxide to that of methane is smaller than that of polymer a1, and the solubility parameter is 16.5 or less.