Importance

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Abstract

Provided are a method for operating a gas separation device capable of performing gas separation with high separation capability and treatment amount in a small membrane area or in a small number of separation membrane modules, and a method for recovering a residual gas capable of performing more suitable detoxifying treatment or recycling by efficiently separating and recovering a mixed gas remaining in a cylinder, using the operating method. Two or more separation membrane modules are connected with each other in parallel. One separation membrane module is continuously and repeatedly operated in an operation cycle including: a first process for supplying a mixed gas into an airtight container and filling the airtight container with pressure; a second process for, when a predetermined time has elapsed or a predetermined pressure has been reached, stopping the supply of the mixed gas and retaining the supplied mixed gas; a third process for, when a predetermined time has elapsed or a predetermined pressure has been reached, recovering the mixed gas from a non-permeated gas discharge port; and a fourth process for, when a predetermined time has elapsed or a predetermined pressure has been reached, closing the non-permeated gas discharge port. The other separation membrane modules are operated in operation cycles shifted by respective predetermined intervals.

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First Claim