Twin Reflux Process and Configurations for Improved Natural Gas Liquids Recovery

US07051553

A two-column NGL recovery plant includes an absorber (110) and a distillation colunm (140) in which the absorber (110) receives two cooled reflux streams, wherein one reflux stream (107) comprises a vapor portion of the NGL and wherein the other reflux stream (146) comprises a lean reflux provided by the overhead (144) of the distillation colunm (140). Contemplat configurations are especially advantageous in a upgrade of an existing NGL plant and typically exhibit C3 recovery of at least 99% and C2 recovery of at least 90%.