1. Costain Energy & Process, 2005Pre-separation (Triple Column). Nitrogen Rejection from Natural Gas. First Presented at GPA 2005. 24 Page Power Point Presentation. Page 21 and 14, http://www.nitrogen-rejection.com/editorimages/downloads/Introduction%20to%20Nitrogen%20Rejection.pdf
2. “Plant Processing of Natural Gas, ” University of Texas Continuing Education Petroleum Extension Service;Elliot,2008
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4. Simultaneous removal of water and BTEX from feed gas for a cryogenic plant;Jones,1999
5. “Nitrogen Removal from Natural Gas, ” Contract Number DE-AC21-95MC32199-02;Membrane Technology and Research, Inc,1999