Sulfur equilibrium relationship, function

As increasing numbers of alkyl and/or phenyl groups are added to the parent benzyl system, cations of increasing stability result. Deno et al. [59] studied the alcohol-carbonium ion equilibria as a function of sulfuric acid concentration and derived an empirical acidicity function, Co, for the water-sulfuric acid system. The acidity function allowed the pKji values for the equilibrium expressed in eq. 7.7 to be determined (Table 7.4). Furthermore, Deno and Schriesheim demonstrated quantitatively the relationship between the rate of an 8 1... 

The dashed line in Figure 8-2 shows the equilibrium fractional conversion of SO2 as a function of temperature, for conditions that are typical of the first SO2 oxidation reactor in a sulfuric acid plant. The solid line shows the energy balance for adiabatic operation. This is the same line shown in Figure 8-1. The two lines intersect at one point S02 = 0-74 T = 593 °C. At this condition, both the energy balance and the equihbrium relationship are satisfied simultaneously. The intersection of the two lines is the only place where this requirement is met. 

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