FIELD: crude oil treatment. SUBSTANCE: raw material is treated by primary and/or secondary alkylamine or alkanolamine, or morpholine, and alifatic or cyclic aldehyde: advantageously, formaldehyde, benzaldehyde, or their mixtures in quantity 1.5-15 mol per 1 mol of hydrogen sulfide to be neutralized. Quantity of amine corresponds to 0.6-10 mol per 1 mol of hydrogen sulfide. Process temperature varies from 5 to 50 C. EFFECT: increased purification degree (98-100%) and reduced power consumption. 3 cl
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