FIELD: technological processes.
SUBSTANCE: method for renewable high-efficiency desulfurization using a slurry layer has been proposed, comprising a stage in which a desulfurization slurry is mixed with a hydrogen sulfide-containing gas to produce a first mixture, the first mixture is passed from the bottom up in the reactor with a suspension layer, while controlling that the exposure time of the first mixture in the reactor with a suspension layer was 5–60 minutes, to allow the desulfurizing suspension to sufficiently come into contact and react with the hydrogen sulfide gas, wherein the hydrogen sulfide gas is selected from the group consisting of biogas, coke oven gas, associated gas, natural gas, petrochemical gas, or any mixture thereof; and the stage in which the second mixture is released from the top of at least one reactor with a suspension layer, the second mixture is subjected to separation into gas and liquid to obtain a purified gas and an enriched solution, and the purified gas is fed into a fixed bed reactor for the second stage of desulfurization and to obtain a second purified gas stream, wherein the fixed bed reactor contains a desulfurizer selected from the group consisting of amorphous iron oxide, iron oxide, iron hydroxide, copper oxide, zinc oxide and any mixture thereof, and the gas flow rate in the fixed bed reactor is from 1 to 20 m/s, and the resulting enriched solution is subjected to a single evaporation, and then reaction with oxygen-containing gas to conduct regeneration. In this way it is possible to reduce the sulfur content in hydrogen sulfide gas from 2.4–140 g/n⋅m3 up to 50 ppm or less by using a slurry layer, and in combination with a fixed bed, the sulfur content can be further reduced to less than 10 ppm.
EFFECT: present invention provides highly efficient desulfurization by combining a fixed bed suspension layer connected in series; this invention has a high regeneration efficiency, and the depleted solution can be reused as a desulfurization suspension, without the formation of secondary pollution, which is very suitable for promoting industrial development.
8 cl, 1 dwg, 8 ex
