USE OF HOT N-METHYL-2-PYRROLIDONE (NMP) FROM SOLVENT EXTRACTION OPERATION TO SUPPLY HEAT TO STRIP H2S FROM NMP-SCRUBBING SOLUTION

摘要

H2S is scrubbed (30) from a gas (32) by N-methyl-2-pyrrolidone to form a scrubbed gas (34) and an H2S-rich NMP solution (36). The latter (36) is passed to a stripping zone (40) where it is stripped of H2S with a stripping gas (11) after first being heated to a stripping temperature by indirect heat exchange (in 26) with a combined stream (24, 25) of stripped NMP solution (46) recovered from the stripping zone (40) and hot NMP (10) from a solvent extraction operation. Scrubbed gas (34) is used to strip NMP from hydrocarbons in the solvent extraction operation and is then used as the stripping gas (11) in the stripping zone (40).