Abstract: Process for removing arsenic compounds and particularly arsine from gases containing the same, by treating said gases with a washing solution consisting either of an alkaline aqueous solution, containing a zinc or lead, salt or oxide and/or one or more salts of anthraquinone sulfonic or disulfonic acids, or of a solution in an organic solvent of at least one quinone compound in the presence of an amine or an ethanolamine.

Abstract: Catalytic oxidation of hydrogen sulfide to sulfur in homogeneous liquid phase, by means of molecular oxygen, in an organic solvent whose water content is lower than 60% by volume, said liquid phase comprising a solvent selected from amides, phosphoramides, sulfoxides, nitriles and ethers, said oxidation being conducted in the presence of at least one catalyst selected from the two following categories:A. a chelate of a transition metal selected from the group of metals consisting of iron, manganese, copper and cobalt, the chelate being selected from the group consisting of dialkyldithiocarbamates, alkylxanthates, dithiolates, 8-hydroxyquinolinates and salicylaldimines,B. a salt of said transition metal of the formula MX.sub.m in which M is the transition metal, X is an anion selected from the group consisting of Cl.sup.-, Br.sup.-, ClO.sub.4.sup.-, NO.sub.3.sup.- and SCN.sup.- and m is 2 or 3.