Refining a gas containing hydrogen sulfide, nitrogen oxides...

B - Operations – Transporting – 01 – D

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23/344

B01D 53/00 (2006.01)

Patent

CA 1100289

ABSTRACT OF THE DISCLOSURE The disclosure describes a process for refining a gas which contains hydrogen sulfide, sulfur oxides and nitrogen oxides and may contain hydrogen cyanide as contaminants. The process comprises contacting the gas with an absorption medium to absorb the contaminants in the absorption medium. The absorp- tion medium contains as catalytic component specified naphtho- quino-chelate prepared by mixing (A) naphthoquinone or a deriva- tive thereof of the general formula Image or naphthodiquinone or a derivative thereof the general formula Image in which X represents hydrogen atom, hydroxyl group, a lower alkyl group, a lower alkoxy group, sulfonic group (-SO3H), car- boxylic group (-COOH), an alkaline metal or alkaline earth metal salt of sulfonic or carboxylic group (such as -SO3Na, -COONa), thioglycol group (-S-CH2-COOH) or thiol group (-SR in which R is a lower alkyl group) with (B) a precursor of a chelating agent which is selected from the group consisting of the reaction product of a metal selected from the group consisting of the metals of groups V, VI, VII and VIII in the fourth period of the Periodic Table, arsenic and selenium with an acid selected from the group consisting of oxalic, citric, tartaric and glutaric acids and aging the mixture of (A) and (B) to form a naphthoquino-chelate compound. The absorption medium further contains as solvent specified diamine selected from among cyclohexadiamine and diamine having the general formula NH2(CnH2n)NH2 in which n is 2, 3 or 4 and mono-, di-, tri- or tetra-acetate, or mono-, di-, tri- or tetra-propionate, or mono-, di-, tri- or tetra-buthylate of said diamine. The ab- sorption medium which has absorbed the contaminants is treated for obtaining sulfur from hydrogen sulfide and sulfur oxides and thiocyanate from hydrogen cyanide while producing a gas having high nitrogen oxides concentration. This process is less polluting than known processes.

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