Method for removing hydrogen sulfide from gas streams
AssigneeLinde Aktiengesellschaft
InventorGunter Weber
Life of this patent
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Abstract
For the simultaneous absorption and oxidation of hydrogen sulfide, gaseous mixtures substantially free of molecular oxygen are scrubbed in a first stage with an aqueous, alkaline scrubbing agent containing pentavalent vanadium as the oxidizing medium. The hydrogen sulfide is absorbed by the scrubbing agent and oxidized to elemental sulfur with reduction of pentavalent vanadium to tetravalent vanadium. The thus-reduced scrubbing agent is then regenerated in a separate second stage in the presence of an amine promoter by reoxidation of the tetravalent vanadium with molecular oxygen, and reused.
Claims16
In a process for the simultaneous absorption and oxidation of hydrogen sulfide to sulfur, comprising the steps of scrubbing in a scrubbing stage a gas consisting essentially of a sour gas containing H.sub.2 S with an aqueous, alkaline scrubbing solution containing pentavalent vanadium as the oxidizing agent, wherein the hydrogen sulfide is absorbed by the scrubbing agent and oxidized by pentavalent vanadium to elemental sulfur with reduction of the pentavalent vanadium to tetravalent vanadium, and then in a regeneration stage, separate from the scrubbing stage, regenerating the thus-reduced scrubbing solution in the presence of a promoter by reoxidation of the tetravalent vanadium gas to pentavalent vanadium with a gas containing molecular oxygen, the improvement wherein the scrubbing solution consists essentially of sodium carbonate, vanadium, and an amine promoter.
An alkaline scrubbing solution for the scrubbing of gases containing H.sub.2 S, said solution consisting essentially of sodium carbonate, vanadium, sodium thiocyanate and at least one soluble salt of an amino carboxylic acid selected from the group consisting of aminoacetic acid, imido-bis-acetic acid, and aminopropionic acid.
An alkaline scrubbing solution for the scrubbing of gases containing H.sub.2 S, said solution consisting essentially of sodium carbonate, vanadium, sodium thiocyanate and at least one soluble salt of an amino carboxylic acid selected from the group consisting of aminoacetic acid, imido-bis-acetic acid, and aminopropionic acid and at least one amine selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, dimethylethanolamine, methyldiethanolamine, methylaminoethanol, dimethylaminopropanol and 2(2-aminoethoxy)ethanol.
Dependencies are inferred from the claim text.