Process and device for treating a gas containing hydrogen sulfide, with recycling of the reduced catalytic solution
First Claim
1. A process for desulfurization of a gaseous feed containing hydrogen sulfide, comprising at least the following stages:
- a) contacting the gaseous feed with a catalytic solution containing at least one polyvalent metal chelated by at least one chelating agent to oxidize the hydrogen sulfide to elemental sulfur and concomitantly reduce the polyvalent metal from a higher oxidation level to a lower oxidation level in an absorption stage, b) recovering a gaseous effluent substantially freed from hydrogen sulfide and said catalytic solution at least reduced and containing elemental sulfur, wherein at least a fraction F1 of said catalytic solution at least reduced and containing solid elemental sulfur is recycled to the absorption stage a), and wherein the grain size of the sulfur grains suspended in the catalytic solution at least reduced after stage a) is determined and the quantity of recycled fraction F1 of said solution is adjusted so as to maintain a desired grain size distribution of the particles.
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Abstract
A process intended for desulfurization of a gaseous feed containing hydrogen sulfide, includes at least the following stages: a) contacting the gaseous feed with a catalytic solution containing at least one polyvalent metal chelated by at least one chelating agent, under suitable conditions for oxidation of the hydrogen sulfide to elemental sulfur and concomitant reduction of the polyvalent metal from a higher oxidation level to a lower oxidation level, b) recovering on the one hand a gaseous effluent substantially freed from hydrogen sulfide and, on the other hand, the catalytic solution at least reduced and containing elemental sulfur, and c) recycling at least a fraction F1 of the catalytic solution at least reduced and containing solid elemental sulfur to absorption stage a) so as to reduce the number of sulfur grains of very small size.
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Citations
11 Claims
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1. A process for desulfurization of a gaseous feed containing hydrogen sulfide, comprising at least the following stages:
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a) contacting the gaseous feed with a catalytic solution containing at least one polyvalent metal chelated by at least one chelating agent to oxidize the hydrogen sulfide to elemental sulfur and concomitantly reduce the polyvalent metal from a higher oxidation level to a lower oxidation level in an absorption stage, b) recovering a gaseous effluent substantially freed from hydrogen sulfide and said catalytic solution at least reduced and containing elemental sulfur, wherein at least a fraction F1 of said catalytic solution at least reduced and containing solid elemental sulfur is recycled to the absorption stage a), and wherein the grain size of the sulfur grains suspended in the catalytic solution at least reduced after stage a) is determined and the quantity of recycled fraction F1 of said solution is adjusted so as to maintain a desired grain size distribution of the particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification