Hydrous gel membranes for gas separation

摘要

This invention relates to hydrous gel membranes for gas separation which comprise support membranes formed by solvent-soluble polymeric materials containing in their repeating unit a bulky structural part and hydrophilic functional groups represented by the following general formula (1) <IMAGE> (1) (R1, R2, R3, and R4 designate hydrogen, alkyl group, and halogen and R5 and R6 designate any one of -H, -SO3H, -COOH, and -OH) and water or an aqueous solution of substances with affinity for CO2 substantially uniformly retained in the support membranes. The membranes show not only high CO2 permeation and CO2 selectivity but also long-term stable membrane performance and ease of fabricability into membranes and are capable of recovering a large volume of CO2 generated at stationary sites efficiently at low cost.