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  • 12 maximum so2 oxidation Heatup Path equilibrium curve intercepts
    Sulfuric Acid Manufacture (Second Edition)#R##N#Analysis Control and Optimization, 2013
    Co-Authors: Matthew J. King
    Abstract:

    Catalyst bed SO2+0.5O2→SO3SO2+0.5O2→SO3 oxidation is represented by Heatup Paths and equilibrium curves. Maximum SO2 oxidation occurs where a feed gas's Heatup Path intercepts its equilibrium curve. High intercept % SO2oxidized values are equivalent to efficient SO3 production. They give efficient H2SO4 production and low SO2 emission. They are obtained by using cool feed gas but warm enough (> 660 K, > 387 °C) for rapid catalytic oxidation. Strong SO2 feed gas gives high intercept temperatures. Above about 12 volume% SO2, intercept temperatures begin to exceed V, Cs, K, Na, S, O, SiO2 catalyst's 900 K (627 °C) degradation temperature. Feed gas stronger than ~ 13 volume% SO2 must be diluted with air or with cooled recycle catalyst bed exit gas. Both increase gas flow and cost