Praxair, Inc. has developed a proprietary nitrogen selective adsorbent and pressure swing adsorption system suitable removing nitrogen and CO2 from well head natural gas. By rejecting the N2, hydrocarbon can be recovered from flare and sold to customers. Based on lab results on similar streams, Praxair estimates that 50 – 80% of the hydrocarbon can be recovered from flare during the flow back operation, depending on its duration (50% in the case of a 5 day flow-back). Each well flowing back for 10 days would flare 14,400 GJ of saleable hydrocarbon and emitting 840 tonnes of CO2. Technology development in this project targets to reduce this by 70%.
The proposed project looks to further develop a modular N2 seperation technology in 4 main steps First, the team will look to demonstrate adsorbent material and pressure swing system performance from representative synthetic feeds of N2 removal from natural gas. Secondly, the team will look to reproduce these results on a “real” gas feed stream that has been processed with a conventional pre-treatment system. In an effort to remove/reduce the need for pre-treatement, the team will take on a third effort to identify superior H2S removal capability adsorbent. Finally, the team will demonstrate N2 removal from natural gas pilot system performance at a commercial field location, using selected advanced material for H2S removal.