Aquaclaus process, Stauffer

One subclass of sulfur dioxide recovery processes incorporates a liquid-phase variation of the Claus reaction for regenerating the absorbent and directly producing elemental sulfur. Processes of this type are the Stauffer Aquaclaus process (88), which was developed specifically for Claus plant tail gases, and the Bureau of Mines Citrate process (89). In each, the absorbent is the sodium salt of a stable, nonvolatile weak acid, which forms a basic solution by hydrolysis. The anion of the acid buffers the solution as acid is formed by the absorption of sulfur dioxide. The spent absorbent, which consists of a solution of sodium sulfite and bisulfite and of the weak acid, is contacted directly wtih hydrogen sulfide. The hydrogen sulfide reacts with the sulfite and bisulfite to yield elemental sulfur, and the regenerated basic salt solution is recirculated to the absorption step. 

Aquaclaus A modification of the Claus process in which hydrogen sulfide is removed from water by reaction with sulfur dioxide. Developed by Stauffer Chemical Company and operated by the Heflin Oil Company, in Queen City, TX. 

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See also in sourсe #XX -- [ ]

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