![]() ![]() To prevent CO 2 freeze-out, the CO 2 concentration in the sweet gas must be less than 900 ppm. The demethanizer overhead reaches temperatures as low as –100☌ to –120☌. The sweet gas product is dried before entering a cryogenic demethanizer, where ethane and heavier NGL are recovered. ![]() This gas feeds an amine sweetening unit, where most of the CO 2 is removed. 5 (GSP5) in Rayong, Thailand, the wellhead gas has CO 2 concentrations ranging from 19 mol% to 23 mol%. The removal of carbon dioxide (CO 2) from natural gas is a necessary treating step prior to cryogenic processing. Burr, Bryan Research and Engineering Inc., Bryan, Texas and S. Optimize capacity and efficiency for an amine unit
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