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Olefin separation membrane and process

United States Patent

5,670,051
September 23, 1997
View the Complete Patent at the US Patent & Trademark Office
A membrane and process for separating unsaturated hydrocarbons from fluid mixtures. The membrane and process differ from previously known membranes and processes, in that the feed and permeate streams can both be dry, the membrane need not be water or solvent swollen, and the membrane is characterized by a selectivity for an unsaturated hydrocarbon over a saturated hydrocarbon having the same number of carbon atoms of at least about 20, and a pressure-normalized flux of said unsaturated hydrocarbon of at least about 5.times.10.sup.-6 cm.sup.3 (STP)/cm.sup.2 .multidot.s.multidot.cmHg, said flux and selectivity being measured with a gas mixture containing said unsaturated and saturated hydrocarbons, and in a substantially dry environment.
Pinnau; Ingo (Palo Alto, CA), Toy; Lora G. (San Francisco, CA), Casillas; Carlos (San Jose, CA)
Membrane Technology and Research, Inc. (Menlo Park, CA)
08/ 652,837
May 23, 1996
This invention was made in part with support from the U.S. Government under Grant number DE-FG03-93ER81579 from the Department of Energy and under Contract Number DMI-9460087 from the National Science Foundation. The Government has certain rights in this invention.