초록 ▼

A process for removing hydrogen sulfide from sour gas streams is disclosed which is carried out in processing equipment which includes steel components resulting in iron from the steel slowly dissolving in the alkaline H2S absorption medium. The solubilized iron tends to react with the hydrogen sulf

A process for removing hydrogen sulfide from sour gas streams is disclosed which is carried out in processing equipment which includes steel components resulting in iron from the steel slowly dissolving in the alkaline H2S absorption medium. The solubilized iron tends to react with the hydrogen sulfide to form iron sulfide which further oxidizes to produce sodium thiosulfate. The preferred absorption medium includes a metal vanadate and boron complex, a quinone type reoxidation catalyst and a metal ferri or ferrocyanide decahydrate compound capable of reacting with the solubilized iron in the alkaline absorption medium to form a precipitate which is unreactive with the dissolved hydrogen sulfide.

대표청구항 ▼

In a method of removing H2S from a sour gas by oxidation of the H2S to free sulfur utilizing equipment which includes steel components, the improved steps of: contacting the sour gas with a liquid alkaline absorption medium capable of absorbing H2S with at least a part thereof forming [HS-]ions, sai

In a method of removing H2S from a sour gas by oxidation of the H2S to free sulfur utilizing equipment which includes steel components, the improved steps of: contacting the sour gas with a liquid alkaline absorption medium capable of absorbing H2S with at least a part thereof forming [HS-]ions, said liquid absorption medium containing a vanadium-boron complex wherein the ratio of boron to vanadium on an elemental basis is such that the [HS-]ions are oxidized to an extent to produce elemental sulfur as the vanadium undergoes reduction and the boron constituent inhibits formation of insoluble vanadium sulfide compounds and consequent thiosulfate formation upon reoxidation of the vanadium; providing a quantity of a quinone type oxidation catalyst in said absorption medium which has substituted radicals on the aromatic ring structure threof separated by two carbon atoms and selected from the group consisting of hydroxy and keto; said oxidation catalyst being present in a concentration sufficient to enhance oxidation of the reduced vanadium; regenerating the absorption medium utilizing a source of oxygen to oxidize the reduced vanadium; and maintaining a sufficient quantity of an iron cyanide compound in said alkaline absorption medium which is compatible with said vanadium-boron complex and the quinone type catalyst and that is capable of reacting with ionic iron entering the absorption medium from the steel components of said processing equipment to form an essentially insoluble precipitate thereby preventing solubilized iron from forming iron sulfide.