| Abstrakt: |
For preliminary assessment of the change in sulfur yield in processing industrial sour gas, the conversion thermodynamics of gases containing 8–100 vol % hydrogen sulfide, with total pressures of 1.0 and 1.3 bar, is studied for the range 250–1350°C. Thermodynamic calculations show that the equilibrium sulfur yield in Claus conversion of industrial sour gas from coke-oven gas is considerably less than in processing pure hydrogen sulfide or strong sour gases from oil and natural-gas refining. A critical parameter in Claus conversion is the equilibrium hydrogen-sulfide concentration below which the equilibrium conversion of hydrogen sulfide is replaced by the generation of hydrogen sulfide. According to the results of thermodynamic calculations at 250°C, it was found that the equilibrium concentration of hydrogen sulfide below which the equilibrium conversion of hydrogen sulfide turns into its generation, is quite significant. That sets a limit on the equilibrium Claus conversion of hydrogen sulfide. In tests of spherical (diameter 5–6 mm) VA-2 vanadium–aluminum catalyst in a Claus reactor producing sulfur on a bench scale (gas flow rate ~1.2 m3/h), the activation energy of sulfur hydrolysis is found to be ~65 kJ/mol. [ABSTRACT FROM AUTHOR] |
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