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Comment PDF Separation Processes

Chementator: Scaleup is set for a natural-gas-treating process that freezes out CO2    

By Gerald Ondrey |

ExxonMobil Corp. (Irving, Tex.; edlinks.chemengonline.com/7373-537) plans to spend more than $100 million on a commercial demonstration of its Controlled Freeze Zone (CFZ) technology for removing carbon dioxide from natural gas. The plant, to be located at the company’s Shute Creek Treating Facility near LaBarge, Wyo., will process about 14 million ft3 /d of varying compositions of CH4, CO2 and hydrogen sulfide, and separate the CO2 and H2S for reinjection. Startup is set for late 2009. Originally piloted in the 1980s and significantly improved since then, CFZ technology combines conventional cryogenic distillation with a special section that induces CO2 freezing to separate CO2, H2S and other components from natural gas. The extracted gas is discharged from the process as a high-pressure liquid stream for injection into underground storage or for use in enhanced oil recovery. ExxonMobil says the process is less expensive than current CO2-separation processes because it requires less equipment, eliminates the use of solvents and lowers gas-reinjection costs, since the gas does not have to be compressed for injection into the ground.   Click here for a full pdf version of the Chementator Section  
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