Fluor Technologies Corporation

John Gebur

Thomas King Chow

Vincent Wai Wong

Satish Reddy

Theresa Flood

Thomasking Chow

Sulfur oxides are removed from an oxygen-containing acid gas in configurations and methods in which oxygen is catalytically removed using hydrogen sulfide, and in which the sulfur oxides react with the hydrogen sulfide to form elemental sulfur. A first portion of the remaining sulfurous compounds is reduced to form the hydrogen sulfide for oxygen removal, while a second portion of the sulfurous compounds is further converted to elemental sulfur using a Claus reaction or catalytic direct reduction reaction.

Configurations and methods for effluent gas treatment

A Claus plant with multiple parallel thermal stages that provide a combined effluent to downstream catalytic stages includes a controller that allows independent and individual control for each of the thermal stages as a function of measured chemical composition of the thermal stage effluents and catalytic stage effluent.

Air demand feedback control systems and methods for sulfur recovery units

Sulfur oxides are removed from an oxygen-containing acid gas in configurations and methods in which oxygen is removed from the acid gas using reducing gases at relatively high temperature. The so treated acid gas is then fed to a direct reduction reactor in which the sulfur species are converted to elemental sulfur. Contemplated configurations are particularly effective and economically attractive as they are generally not limited by reaction equilibrium as present in a Claus reaction and do not require solvent and solvent-associated equipment.

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Carbonyl sulfide (COS) from a COS-containing stream () is convened in a Claus plant () to elemental sulfur () by oxidation of a first portion of the COS-containing stream to SOand by hydrolysis of a second portion of the COS-containing stream to HS. In preferred aspects of the inventive subject matter, hydrolysis and/or oxidation of the COS is performed in the reactor furnace (), while hydrolysis of the COS is performed in the reactor furnace (), a hydrolysis reactor, and/or a catalytic converter ().

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El Monte, CA, United States of America

John Gebur