FIELD: gas treatment. SUBSTANCE: gas is brought in contact with 10-50% formaldehyde solution containing water-soluble organic base, in particular, primary or secondary alifatic amine in amount providing (0.5-1.5):1 amine/formaldehyde molar ratio in original solution and process is carried out until hydrogen sulfide/formaldehyde molar ratio achieves 0.7:1. EFFECT: enhanced efficiency of process. 2 cl
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