Removing h.sub.2s from tail gas with recycled nmp extraction...

Details Removing h.sub.2s from tail gas with recycled nmp extraction... Removing h.sub.2s from tail gas with recycled nmp extraction...

B - Operations, Transporting

01

D

23/346

B01D 53/34 (2006.01) B01D 53/14 (2006.01) C10G 67/00 (2006.01) C10G 67/04 (2006.01) C10G 67/16 (2006.01)

Patent

CA 1123175

U.S. 973,680 ABSTRACT OF THE DISCLOSURE An improved process for removing H2S from a hydrofiner tail gas wherein said tail gas is passed into a scrubbing zone wherein it is contacted with liquid NMP to remove most of the H2S from the gas to form an H2S-rich NMP solution and the H2S-rich NMP solution is heated and passed into a stripping zone to remove most of the H2S from the NMP to form and H2S-lean NMP solution, extracting a hydrocarbon oil with an NMP solution, recovering hot, liquid, NMP from said extracted oil and combining it with said H2S-lean NMP solution and wherein said combined solution comprises at least a portion of said NMP solution used to extract said oil, wherein the improvement comprises heating the H2S-rich NMP solution to the required stripping temperature by indirectly contacting same, in heat exchange relationship, with at least a portion of said combined NMP solution.

340435

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