Membrane technology removes CO2 from liquid ethane

A 2,000-b/d pilot facility using a full-size membrane element to remove CO2 from liquid ethane started up on August 2000 at the BP Empress ethane and NGL extraction facility, Medicine Hat, Alta. The pilot plant constructed by NATCO-Cynara has successfully operated for more than 1 year.Membranes are widely used to remove CO2 from natural gas. Using membranes to remove CO2 from NGL is relatively new. The BP facility demonstrated that cellulose acetate hollow fiber membranes are effective in removing CO2 from liquid ethane.In addition, the facility:Demonstrated insignificant ethane losses to permeate.Provided an unexpected benefit of removing some methane from the ethane.Proved that membrane...

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