| 摘要 |
An integrated process to selectively remove and separate H2S, CO2 and COS from a feed gas stream is disclosed. The process involves three separate absorption/regeneration steps. In the first step the feed gas is contacted with an absorbent solution to selectivity remove CO2 and H2S but not COS. The COS-rich stream is then contacted in another stage to selectively remove the COS. After stripping the CO2 and H2S gaseous stream from the first stage, the acid gas stream is contacted with a separate absorption stream to selectively remove the H2S. As a result four separate gaseous streams are produced-a purified acid gas-free stream, a COS stream, an H2S stream and a CO2 stream.
|
