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174 Gas Purification

and Condit (1952) in which MEA is added to the caustic prewash upstream of an extractive
Meros unit to achieve COS removal. According to Johnson and Condit, the MEA concentra-
tion in the caustic must be maintained at about 1.5 wt% or higher to achieve nearly complete
COS removal (~0.04 ppmw COS reported as S). The caustic concentration must be pater
than 3.0 wt% for the reaction to occur, and the volumetric ratio of the formulated caustic to
the LPG flow should be 10: 1. When both MEA and caustic are. present, the MEA is not con-
sumed by reaction with the COS.

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