286883 Cryogenic CO2 Removal From Natural Gas by Desublimation in Staged Heat Exchanger

Thursday, November 1, 2012: 12:30 PM
403 (Convention Center )
Mark Jensen1, Larry L. Baxter1, Chris Bence2, Christopher Hoeger3 and Kyler Stitt3, (1)Chemical Engineering, Brigham Young University, Provo, UT, (2)Sustainable Energy Solutions, Provo, UT, (3)Sustainable Energy Solutions, Orem, UT

A new and novel method is proposed for removal of CO2 in raw natural gas streams by cooling the natural gas stream to -130 °C at near ambient pressures, causing CO2 in the natural gas stream to desublimate. Desublimation occurs in a novel desublimating heat exchanger with a low vapor pressure contact liquid and/or liquefied natural gas (LNG). The heat exchanger is staged, with the raw natural gas feed bubbled through contact liquid and/or LNG. The desublimating solid CO2 is entrained in the contact liquid and/or LNG and subsequently separated through filtration. The cold purified CO2 and natural gas products then return through a regenerative heat exchanger to cool incoming natural gas and melt the purified solid CO2 stream. The overall energy efficiency of this system exceeds that of competing desublimation technologies by reducing the required pressure of operation and eliminating the significant losses of a distillation tower in reboiling and condensing.

Extended Abstract: File Uploaded
See more of this Session: Advances in Fluid-Particle Separation Processes
See more of this Group/Topical: Separations Division