METHOD OF BIOLOGICAL TRANSFORMATION OF BISULPHIDE INTO ELEMENTAL SULFUR Russian patent published in 2018 - IPC C01B17/05 C02F3/30 C02F1/72 B01D53/84 C02F101/10 C02F103/18 

FIELD: chemical industry.

SUBSTANCE: group of inventions can be used in the chemical industry in order to process a natural gas stream, which contains sulfur compounds, including hydrogen sulfide and bisulfides, with the formation of elemental sulfur. To carry out the process, the bisulphide, which is dissolved in an aqueous solution, is converted to elemental sulfur in the presence of sulfide-oxidizing bacteria under anaerobic conditions and the first liquid effluent is obtained, which contains elemental sulfur, the sulfide-oxidizing bacteria, which are used in the presence of an oxidizing agent, are recovered in order to obtain the second liquid effluent, elemental sulfur is separated from the first and/or second liquid effluent, regenerated sulphide oxidizing bacteria are used in the step of converting bisulphide to elemental sulfur. Devices include the absorption column (2), which has the acid gas inlet (1), discharge of the treated gas (4), the inlet of the alkaline liquid absorbent (3) and the discharge of the saturated liquid (5), the first bioreactor (6), which operates under anaerobic conditions and has the inlet that is connected to the outlet (5) and discharge of the first liquid stream (7), the second bioreactor (8), which operates under aerobic conditions and has the inlet that is connected to the outlet (7), the outlet of the second liquid stream (11), the elemental sulfur recovery unit (15), which has the inlet that is connected to the outlet (7) or (11), discharge of elemental sulfur (17) and discharge of a liquid stream that is depleted of elemental sulfur (18).

EFFECT: inventions ensure the selective oxidation of bisulphides while reducing the formation of undesirable reaction by-products, as well as the obtainment of a precipitate of the recovered sulfur of improved shape.

22 cl, 4 dwg, 2 ex