image
Figure 7E5.1 Effect of pressure, temperature, and SO2 feed on conversion to SO3 (sulfur burning).

Example 7.6

Starting from pyrite, plot the equilibrium curve for various pressures (0.8 atm, 1 atm, 1.2 atm) and initial concentrations of SO2 to the converter (6%, 8%, 10%).

Solution

Consider the reaction stoichiometry and the equilibrium constant for the oxidation of SO2:

SO2+12O2SO3Kp=PSO3PSO2·PO20.5log10(Kp)=4956T4.678

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Assume 1 kmol of dry air. The mass balances for the pyrite roasting and the sulfur dioxide conversion are as follows (Table ...

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