Solvents for the selective removal of H.sub.2 S from gases conta

Details Solvents for the selective removal of H.sub.2 S from gases conta Solvents for the selective removal of H.sub.2 S from gases conta

1992-03-02

1994-01-11

Lewis, Michael

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423228, 95235, B01D 5334

Patent

active

052778843

ABSTRACT:
A novel class of solvents is described that have improved selectivity for H.sub.2 S as compared to CO.sub.2. The solvents are based on adding suitable second partially miscible solvent to known solvents. In specific, it is shown that adding 20% of dodecane to NMP (normal methyl pyrolidinone) increases the selectivity of the solvent for H.sub.2 S as compared to CO.sub.2 by 50%. This leads to important process improvements and reduction in the cost of the removal process.

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Ludmer, Z. et al. "Solubility in Binary Mixtures at the Immiscibility Critical Point". American Institute of Chemical Engineer. Journal, Nov. 1987, pp. 1776-1780.

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