초록 ▼

A process for removing hydrogen sulfide from sour gas streams is provided wherein the sour gas is passed in cocurrent flow relationship with a liquid alkaline absorption solution containing a vanadium-boron complex characterized by the properties of reacting with the H2S thereby oxidizing [HS-]to el

A process for removing hydrogen sulfide from sour gas streams is provided wherein the sour gas is passed in cocurrent flow relationship with a liquid alkaline absorption solution containing a vanadium-boron complex characterized by the properties of reacting with the H2S thereby oxidizing [HS-]to elemental sulfur in conjunction with reduction of the vanadium while the boron constituent is functional to inhibit formation of insoluble vanadium sulfide compounds. Regeneration of the absorption medium by contact with an oxygen containing gas is enhanced by the provision of an iron-polyamine organic acid oxidation catalyst in the absorption liquid. The process is a direct replacement for and may be operated far more economically than conventional Stretford processes.

대표청구항 ▼

In a method of removing H2S from a sour gas by oxidation of the H2S to free sulfur, the improved steps of: bringing the sour gas into H2S absorbing relationship with a liquid alkaline absorption medium whereby H2S is absorbed and at least part thereof forms [HS-]ions, said liquid absorption medium b

In a method of removing H2S from a sour gas by oxidation of the H2S to free sulfur, the improved steps of: bringing the sour gas into H2S absorbing relationship with a liquid alkaline absorption medium whereby H2S is absorbed and at least part thereof forms [HS-]ions, said liquid absorption medium being essentially devoid of anthraquinone disulfonic acid compounds and containing a vanadium-boron complex capable of oxidizing the [HS-]ions to produce elemental sulfur as the vanadium undergoes reduction and the boron constituent functions to inhibit formation of insoluble vanadium sulfide compounds and consequent thiosulfate formation upon re-oxidation of the vanadium, the ratio of boron to vanadium in said absorption medium being at least about 1:1; regenerating the absorption medium by adding an oxygen source thereto to oxidize the reduced vanadium; and providing a sufficient quantity of an iron complex catalytic agent during regeneration of the absorption medium which is capable of catalyzing re-oxidation of the reduced vanadium to enhance oxidation of the latter without deleteriously affecting recoverability of free sulfur from the absorption medium.