초록 ▼

A process for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane system in combination with an adsorption system, the adsorption system used either before or after the membrane system. In either c

A process for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane system in combination with an adsorption system, the adsorption system used either before or after the membrane system. In either case the membrane portion of the combined system comprises the steps of: compressing a gas stream containing a diluent gas and fluorochemicals to an elevated pressure; heating the gas stream containing a diluent gas and fluorochemicals to an elevated temperature sufficient to increase the flux of the permeate stream and to increase the selectivity of the membrane for the permeation of the diluent gas relative to the permeation of the fluorochemicals; contacting the gas stream with a membrane which is selectively more permeable to the diluent gas than the fluorochemicals to result in a permeate stream rich in the diluent gas and a retentate rich in fluorochemicals; contacting the gas stream with one or more additional membranes which are selectively more permeable to the diluent gas than the fluorochemicals to result in a second permeate stream rich in the diluent gas and a second retentate rich in fluorochemicals; and recycling the second permeate stream to be compressed with the gas stream containing diluent gas and fluorochemicals to an elevated pressure.

대표청구항 ▼

[ We claim:] [1.] A process for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane, comprising the steps of:(a) compressing a gas stream containing a diluent gas and fluorochemicals to an elevated

[ We claim:] [1.] A process for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane, comprising the steps of:(a) compressing a gas stream containing a diluent gas and fluorochemicals to an elevated pressure;(b) heating the gas stream containing a diluent gas and fluorochemicals to an elevated temperature sufficient to increase the flux of the permeate stream of step (c) and to increase the selectivity of the membrane of step (c) for the permeation of the diluent gas of step (c) relative to the permeation of the fluorochemicals of step (c);(c) contacting the gas stream with a membrane which is selectively more permeable to the diluent gas than the fluorochemicals to result in a permeate stream rich in the diluent gas and a retentate rich in fluorochemicals;(d) contacting the retentate with one or more additional membranes which are selectively more permeable to the diluent gas than the fluorochemicals to result in a second permeate stream rich in the diluent gas and a second retentate rich in fluorochemicals;(e) recycling the second permeate stream to step (a) to be compressed with the gas stream containing diluent gas and fluorochemicals to an elevated pressure;(f) passing the second retentate rich in fluorochemicals to an adsorption system wherein enriched diluent is vented and a stream further enriched in fluorochemicals is adsorbed; and(g) desorbing said stream further enriched in fluorochemicals as a product stream.