Patent ID: 6482251
Filing Date: 2002-11-19
Classification: B01D,C07C,Y02C,Y02P

Abstract:
A perfluoro compound separation recovery method for separating and recovering perfluoro compound gas by contacting it with a membrane which permeates more diluent gas than perfluoro compound gas, after high-pressurizing diluted mixed gas consisting of perfluoro compound gas and diluent gas, comprising the steps of separating high-pressurized diluted mixed gas into a permeable gas flow rich in diluent gas and a non-permeable gas flow rich in perfluoro compound gas by contacting it to the membrane; repeatedly separating the non-permeable gas flow into another permeable gas flow and another non-permeable gas flow by contacting the non-permeable gas flow with another membrane having the same functions as those of the membrane; detecting pressure or a flow rate of the other permeable gas flow; controlling a flow rate of the other non-permeable gas flow so as to set the pressure or flow rate constant; and recovering the other non-permeable gas flow.