| 主权项 |
1. A gas separation membrane comprising a support and a separating layer formed on the support,
the separating layer comprising a main body and a hydrophilic layer; the main body being disposed on the side of the support; the hydrophilic layer being disposed on the farther side away from the support than the main body and comprising a hydrophilic polymer, wherein the hydrophilic polymer comprises at least one selected from the group consisting of polyvinyl alcohol, polyacrylic acid, polystyrene sulfonic acid, polyacrylamide, polyethylene glycol, polysaccharides, and gelatin; and a resin constituting the main body of separating layer is selected from the group consisting of a polyimide resin, a polyamide resin, a cellulose resin, a polydimethylsiloxane resin, and a polyethylene glycol resin, said gas separation membrane further comprising a mixed layer between the hydrophilic layer and the main body of separating layer, the mixed layer mixedly comprising the constituent component of the hydrophilic layer and the constituent component of the main body of separating layer, the mixed layer having a thickness of 0.01 μm to 1 μm, and said gas separation membrane providing a transmission rate ratio of carbon dioxide to methane of 10 or more as applied to separation of a mixed gas containing benzene, toluene and xylene organic components in addition to carbon dioxide and methane. |
