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Equilibria in the systems C−O−S and C−O−S−H as related to sulfur recovery from sulfur dioxide

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Abstract

Equilibrium phase diagrams for the titled systems, showing gas composition as a function of temperature for the carbon and sulfur-saturation surfaces, were calculated from thermochemical data on the numerous gas species present. The recent experimental work of Drowart,et al 1. was used to obtain consistent thermodynamic behavior for the seven vapor polymers of sulfur (S n ,n=2 to 8). For the system C−O−S−H, only the pseudo-ternary at the constant atom ratio H/C=4.0 is presented. An iterative procedure, adapted for the digital computer, was used to solve the complex equilibria involved. The influence of the equilibrium chemistry on the design of processes to reduce SO2 with C, CO, and CH4 is discussed. In all cases, production of sulfur vapor reaches a sharp maximum at the gas composition having the atom ratio (H+C)/O =(1+X)/(2+X/2), whereX is the atom ratio H/C in the reducing agent. Reducing agents with lower values ofX yield better sulfur recovery because of the smaller residual amount of H2S and SO2 in the reacted gas.

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Authors and Affiliations

  1. Henry Krumb School of Mines, Columbia University, New York, N.Y.

    H. H. Kellogg (Stanley-Thompson Professor of Chemical Metallurgy)

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  1. H. H. Kellogg
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Kellogg, H.H. Equilibria in the systems C−O−S and C−O−S−H as related to sulfur recovery from sulfur dioxide. Metall Trans 2, 2161–2169 (1971). https://doi.org/10.1007/BF02917545

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  • DOI: https://doi.org/10.1007/BF02917545

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