In Ethylene production one of the most important steps is removal of Hydrogen Sulfide and Carbon Dioxide from the process stream. Both H 2 S and CO 2 are poisons to polymerization catalysts, and the allowable levels of both components are less than 5 ppmw in polymer grade Ethylene. Caustic Wash Tower Hydrogen Sulfide is required in Ethylene cracking furnaces to passivate the coil metallurgy, and also to limit the formation of CO 2 and CO.

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