FIELD: chemistry.
SUBSTANCE: invention relates to cleaning hydrocarbon gas from sulphur compounds and can be used in oil and gas processing, gas chemical and other industries. Method for neutralization of sulphur compounds of acid gases after amine purification of low-sulphur hydrocarbon gas includes stages of absorption selective extraction of hydrogen sulphide, regeneration of saturated absorbent solution, thermal stage of hydrogen sulphide oxidation, two catalytic stages, hydrogenation of gas flow with formation of process gas flow and water washing of process gas flow. Cooled process gas from the water washing step is directed to the absorption selective extraction of hydrogen sulphide step, pre-mixing with the initial acid gas formed after the absorbent regeneration, and is subjected to selective absorption purification from hydrogen sulphide with formation of a circulation complex of chemical processes with a closed loop on the gases to be purified, and different catalysts are used at catalytic stages 1 and 2.
EFFECT: invention increases output of elementary sulphur, reduces emissions of sulphur oxides into the atmosphere, and reduces the number of devices used in the process.
10 cl, 1 dwg, 1 ex
