US 12,509,639 B2Granted

Removal of acid gases from gaseous mixtures containing them

AssigneeENI S.p.A.

InventorsAlberto Renato De Angelis, Gianluca Fiori, Filomena Castaldo

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Abstract

An acid gas absorbing mixture and a process for the removal of acid gases from gaseous mixtures containing them, such as natural gas, air and flue gases and an absorbent mixture usable for the removal of acid gases from gaseous mixtures containing them includes at least one diol of general formula R(OH)2 having a normal boiling point equal to or greater than 100° C.; at least one organic base having a pKb (in water) lower than or equal to 3; and a polar aprotic solvent having a dielectric constant ε at 25° C. greater than or equal to 30, a viscosity μ at 25° C. lower than or equal to 40 cP (centipoise). The organic base/diol weight ratio is lower than or equal to 0.6, and the aprotic solvent/diol weight ratio is between 0.05 and 0.6.

Claims9

Dependent claims

An absorbent mixture usable for the removal of acid gases from gaseous mixtures containing them, the absorbent mixture comprising:

A) at least one diol of general formula R(OH)2 having a normal boiling point equal to or greater than 100° C., wherein R is an alkyl group, linear or branched, possibly substituted, having a number of carbon atoms comprised between 2 and 8;
B) at least one organic base having a pKb (in water) lower than or equal to 3;
C) a polar aprotic solvent having a dielectric constant F at 25° C. greater than or equal to 30, a viscosity p at 25° C. lower than or equal to 40 cP (centipoise), and a normal boiling point equal to or greater than 140° C.,
and wherein
the organic base/diol weight ratio is lower than or equal to 0.6,
the aprotic solvent/diol weight ratio is comprised between 0.05 and 0.6,
wherein the polar aprotic solvent is selected from dimethyl sulfoxide (DMSO), sulfolane (SO) and nitrobenzene (NB), preferably sulfolane.

4 more elements

Dependencies are inferred from the claim text.