Removing hydrogen sulfide from gas washing solution, in which both hydrogen sulfide and sulfur are soluble, comprises e.g. releasing hydrogen sulfide in gas washing solution, oxidizing hydrogen sulfide, and precipitating elemental sulfur

摘要

Removing hydrogen sulfide from a gas washing solution, in which both hydrogen sulfide and sulfur are soluble, comprises: (a) releasing the hydrogen sulfide in the gas washing solution, (b) oxidizing the hydrogen sulfide to elemental sulfur, and (c) precipitating elemental sulfur, where the step (c) further comprises (d) precipitating crystalline sulfur by mixing at least a portion of gas washing solution with crystallization fluid, (e) separating sulfur from fluid mixture of gas washing solution and crystallization fluid, and (f) separating the crystallization fluid from gas washing solution. Removing hydrogen sulfide from a gas washing solution, in which both hydrogen sulfide and sulfur are soluble, comprises: (a) releasing the hydrogen sulfide in the gas washing solution, (b) oxidizing the hydrogen sulfide to elemental sulfur, and (c) precipitating the elemental sulfur, where the step (c) further comprises (d) precipitating crystalline sulfur by mixing at least a portion of the gas washing solution with a crystallization fluid, where the elemental sulfur is insoluble in the crystallization fluid or has a solubility, which is at least smaller by a factor of 10 than the solubility of the sulfur in the gas washing solution, (e) separating the sulfur from the fluid mixture of gas washing solution and crystallization fluid, and (f) separating the crystallization fluid from the gas washing solution. An independent claim is also included for a device for removing hydrogen sulfide from the gas washing solution in a gas washing circuit, comprising (i) an absorption column (1), a heat exchanger (5) and a desorption column (3), where the desorption column, in which the hydrogen sulfide is oxidized to elemental sulfur exhibits a feed (31) for a gaseous stripping medium and a gas washing solution inlet, where the feed for a gaseous stripping medium is connected with a gas washing solution outlet of the gas washing device, and a gas washing solution flow and an exhaust pipe, (ii) a crystallizer (4) comprising a gas washing solution inlet for receiving at least part of the scrubber solution from scrubber solution flow, a crystallization fluid supply line for supplying a crystallization fluid, a sedimentation section for settling the crystallized sulfur, an outlet for removing the crystallized sulfur and a gas washing solution flow for removing the sulfur gas washing solution from the crystallizer, (iii) a rear guide, which is connected to the gas washing solution flow and the gas scrubbing circuit, and (iv) a fluid separating device for separating the crystallization fluid from the gas washing solution.