Research Triangle Institute

Noxso Corporation

Scott M Harkins

Santosh Kumar Gangwal

Thomas P Dorchak

John L Haslbeck

Carroll H Sherman

A method for producing elemental sulfur and reduced/oxidized sulfur compounds from sulfur containing gases. The method comprises mixing a primary gas stream of sulfur-containing gases with a secondary gas stream to produce a combined gas stream having a preselected stoichiometry and contacting the combined gas stream with a catalyst at a pressure of 7 to 100 atmospheres and a temperature of 540.degree. to 700.degree. C. The catalyst is selected from the group consisting of silica, titania, alumina, sodium/alumina, zinc titanate, alumina or titania promoted with transition metals nickel, cobalt, molybdenum, tungsten, alloys and mixtures thereof and mixture of such catalysts.

Method for producing elemental sulfur from sulfur-containing gases

A downcomer including a tubular member oriented vertically and extending downwardly from a fluidized grid and including a lower portion provided with an inclined opening formed at a first angle with respect to the tubular member, and a flapper valve including an upper portion and a lower portion formed at a second angle with respect to the upper valve portion, the upper portion of the flapper valve is mounted pivotally to the tubular member at a position to normally place the lower portion of the flapper valve in engagement with and closing the inclined opening.

Downcomer and flapper valve

A method for producing elemental sulfur and reduced/oxidized sulfur compounds from sulfur containing gases. The method comprises mixing a primary gas stream of sulfur-containing gases with a secondary gas stream to produce a combined gas stream having a preselected stoichiometry and contacting the combined gas stream with a sorbent/catalyst. The sorbent/catalyst is selected form the group consisting of silica, alumina, and other Claus-type catalysts, sodium/alumina, zinc ferrite, zinc titanate, and other mixed metal oxides, and mixtures thereof.

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Pittsburgh, PA, United States of America

Scott M Harkins