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Nitrogen removal from natural gas using two types of membranes

United States Patent

October 7, 2003
View the Complete Patent at the US Patent & Trademark Office
A process for treating natural gas or other methane-rich gas to remove excess nitrogen. The invention relies on two-stage membrane separation, using methane-selective membranes for the first stage and nitrogen-selective membranes for the second stage. The process enables the nitrogen content of the gas to be substantially reduced, without requiring the membranes to be operated at very low temperatures.
Baker; Richard W. (Palo Alto, CA), Lokhandwala; Kaaeid A. (Fremont, CA), Wijmans; Johannes G. (Menlo Park, CA), Da Costa; Andre R. (Menlo Park, CA)
Membrane Technology and Research, Inc. (Menlo Park, CA)
10/ 245,904
September 17, 2002
This invention was made in part with Government support under SBIR award number DE-FG03-01ER83274 awarded by the Department of Energy. The Government has certain rights in this invention.