Solvent recovery device

Abstract

A solvent recovery device is configured to liquefy and recover a solvent gas from a mixed gas of the solvent gas and a carrier gas. The solvent recovery device includes: a multi-tube heat exchanger; an actuator; and a control circuit. The multi-tube heat exchanger includes a plurality of tubes arranged in parallel through which the mixed gas circulates, and a shell accommodating the plurality of tubes and circulating a cooling medium around the plurality of tubes. The actuator is configured to change a total surface area that is a sum of surface areas of inner walls of a tube or a plurality of tubes through which the mixed gas is brought to flow, among the plurality of tubes. The control circuit is configured to control the actuator to change the total surface area according to a gas concentration of the solvent gas in the mixed gas.

Dependencies are inferred from the claim text.