The present invention provides a pervaporation membrane suitable for a long-term process for separating a volatile organic compound from an aqueous solution containing the organic compound. A pervaporation membrane includes a separation functional layer including a silicone resin. A ratio R of a value to a Young's modulus A1 (MPa) of the separation functional layer before a test below is 30% or more, the value being determined by subtracting the Young's modulus Al from a Young's modulus A2 (MPa) of the separation functional layer after the test. Test: The separation functional layer is immersed in a liquid mixture consisting of n-butanol and water for three weeks. The separation functional layer is taken out of the liquid mixture and dried. A content of n-butanol in the liquid mixture is 1.0 wt %, and the liquid mixture has a temperature of 80 C.

The present invention provides a pervaporation membrane suitable for inhibiting a separation functional layer from peeling off a porous support when the pervaporation membrane is drawn from a wound body of the pervaporation membrane. The pervaporation membrane of the present invention includes: a separation functional layer including a silicone resin; and a porous support supporting the separation functional layer. For the pervaporation membrane, a peeling strength measured by a test below is 0.15 N/20 mm or more. Test: The pervaporation membrane is cut to 20 mm in width and 150 mm in length to give a test piece. The separation functional layer of the test piece is peeled off the porous support of the test piece at a peel angle of 180 and a tensile speed of 300 mm/min.

The present invention provides a new pervaporation membrane suitable for separating a volatile organic compound from an aqueous solution containing the organic compound. A pervaporation membrane of the present invention includes: a separation functional layer; and a porous support supporting the separation functional layer. The porous support has a surface facing the separation functional layer, the surface including a plurality of opening portions. An average diameter of the opening portions is 0.5 m or more. For the pervaporation membrane, a peeling strength measured by a test below is 0.15 N/20 mm or more. Test: The pervaporation membrane is cut to 20 mm in width and 150 mm in length to give a test piece. The separation functional layer of the test piece is peeled off the porous support of the test piece at a peel angle of 180 and a tensile speed of 300 mm/min.