Separation membrane and laminate

A separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B),

• the separation membrane comprising a first surface and a second surface opposite to the first surface,
• wherein an interaction energy between the component (A) and the first surface side of the separation membrane is higher than an interaction energy between the component (B) and the first surface side of the separation membrane, and
• wherein an interaction energy between the component (A) and the second surface side of the separation membrane is lower than the interaction energy between the component (A) and the first surface side of the separation membrane.

A separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B),

• the separation membrane comprising a first surface and a second surface opposite to the first surface,
• wherein a swelling amount of the first surface side of the separation membrane with the fluid is smaller than a swelling amount of the second surface side of the separation membrane with the fluid, and
• wherein a vapor permeance ratio in terms of the component (A) to the component (B) of the first surface side of the separation membrane is larger than a vapor permeance ratio in terms of the component (A) to the component (B) of the second surface side of the separation membrane.