Stopping method for a separation device

Abstract

A stopping method for a separation device is a stopping method for a separation device, which is to be performed after a dehydration step using a separation membrane, the separation device including the separation membrane, the stopping method including: placing the separation membrane under an environment A in which a water vapor partial pressure P(H2O) and a saturation water vapor pressure Psat(H2O) satisfy a relationship of [P(H2O)/Psat(H2O)≥0.001] and a temperature is 100° C. or higher; and decreasing a temperature of the environment A.

Dependencies are inferred from the claim text.