Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture
Patent
1978-12-27
1980-06-17
Thomas, Earl C.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
423226, 55 73, 208326, B01D 5334
Patent
active
042083826
ABSTRACT:
An improved process for removing H.sub.2 S 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 H.sub.2 S from the gas to form an H.sub.2 S-rich NMP solution and the H.sub.2 S-rich NMP solution is heated and passed into a stripping zone to remove most of the H.sub.2 S from the NMP to form an H.sub.2 S-lean NMP solution, extracting a hydrocarbon oil with an NMP solution, recovering hot liquid, NMP from said extracted oil and combining it with said H.sub.2 S-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 H.sub.2 S-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.
This process is especially useful for scrubbing H.sub.2 S from hydrofiner tail gas for use as once-through stripping gas in the solvent recovery section of a lube oil extraction process employing NMP as the extraction solvent, and in a preferred embodiment, the spent stripping gas from the lube oil solvent recovery is used as the stripping gas in the stripping zone of this invention.
REFERENCES:
patent: 3120993 (1964-02-01), Thormann et al.
patent: 3245752 (1966-04-01), Fryar et al.
patent: 3324627 (1967-06-01), Kohrt
patent: 3492788 (1970-02-01), Hochgesand et al.
patent: 3656275 (1972-04-01), Hunter
patent: 4057491 (1977-11-01), Bushnell et al.
Blume John H.
Bushnell James D.
Leighton Milton D.
Allocca Joseph J.
Corcoran E. M.
Exxon Research & Engineering Co.
Thomas Earl C.
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