| 摘要 |
Liquid and gaseous hydrocarbon streams are treated to remove COS by contacting the hydrocarbon streams with an aqueous solution of selective H2S-absorbent and a COS absorbent/hydrolyzer whereby COS is hydrolyzed to H2S and CO2 and said products are absorbed by the H2S absorbent in the selective range thereof. Preferably, the H2S absorbent is an alkanolamine, especially methyldiethanolamine, and the COS absorbent/hydrolyzer is an organic liquid, especially diisopropanolamine. The resultant hydrocarbon stream can be further treated in one or more subsequent steps with aqueous caustic solution containing, in some steps, a primary alkanolamine, especially monoethanolamine, to remove acid gases and, in particular, to reduce the COS content to below 1,000 ppb. |
