Control of carbonyl sulfide with sodium borohydride in caustic towers for petroleum/petrochemical processes

摘要

Sodium borohydride (NaBH₄) may be used to removing carbonyl sulfide (COS) from a process stream containing it. The method involves contacting the process stream with an amount of effective of NaBH₄ to react with the COS to form reaction products that may be removed by a process of washing away the reaction product by an aqueous basic compound and/or the reaction product having a higher boiling point than carbonyl sulfide which permits trapping the reaction product, such as in a caustic tower.