06572678 is referenced by 42 patents and cites 1 patents.

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 capability to exhibit a nitrogen/methane selectivity between about 2 and 5 at a temperature higher than about −25° C. The gas may be brought to pipeline specification for nitrogen, and acid gases if present, without requiring the use of amine scrubbing or other acid gas removal technique.

Title
Natural gas separation using nitrogen-selective membranes of modest selectivity
Application Number
10/33680
Publication Number
6572678 (B1)
Application Date
December 28, 2001
Publication Date
June 3, 2003
Inventor
Ingo Pinnau
Palo Alto
CA, US
Zhenjie He
Fremont
CA, US
Richard W Baker
Palo Alto
CA, US
Johannes Gerard Wijmans
Menlo Park
CA, US
Agent
J Farrant
US
Assignee
Membrane Technology and Research
CA, US
IPC
B01D 53/22
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