Carbon dioxide hydrocarbons separation process utilizing liquid-liquid extraction

摘要

Carbon dioxide is cryogenically separated from methane and then is separated from the ethane by liquid extraction with water at high pressures of 500 to 2250 psia thus avoiding the CO2-C2H6 azeotrope problem. The process is particularly applicable to the recovery of high pressure pure carbon dioxide from the wellhead products of carbon dioxide flooding used in enhanced oil recovery. The high pressure pure carbon dioxide liquid is pumped for reinjection to the well.