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Johannes Gerard Wijmans, Richard W Baker, Zhenjie He, Ingo Pinnau: Natural gas separation using nitrogen-selective membranes of modest selectivity. Membrane Technology and Research, J Farrant, June 3, 2003: US06572678 (42 worldwide citation)

A process for treating natural gas or other methane-rich gas to remove excess nitrogen and optionally excess carbon dioxide, water vapor or hydrogen sulfide. The invention relies on gas separation by membranes, using nitrogen/methane selective membranes. The membranes are characterized by having the ...


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Richard W Baker, Johannes G Wijmans, Zhenjie He, Ingo Pinnau: Natural gas separation using nitrogen-selective membranes. Membrane Technology and Research, J Farrant, May 20, 2003: US06565626 (37 worldwide citation)

A process for treating natural gas or other methane-rich gas to remove excess nitrogen and carbon dioxide simultaneously. The invention relies on membrane separation using nitrogen/methane and carbon dioxide/methane selective membranes. The gas can typically be brought to pipeline specification for ...