Temperatures, industrial output acid

Industrial H2S04 making input and output acid temperatures (Table 9.3) are typically ... 

Of course, output acid temperature will increase if mass% H2S04 in output acid is allowed to increase with increasing volume% S03 in H2S04 making tower input gas, Fig. 24.4. This is the case when input acid flowrate and mass% H2S04 are kept constant while volume% S03 in input gas increases. This is usual industrial practice. 

Fig. 21.1. Heat transfer flowsheet for single contact, sulfur burning sulfuric acid plant. It is simpler than industrial plants, which nearly always have 4 catalyst beds rather than 3. The gaseous product is cool, S03 rich gas, ready for H2S04 making. The heat transfer product is superheated steam. All calculations in this chapter are based on this figure s feed gas composition and catalyst bed input gas temperatures. All bed pressures are 1.2 bar. The catalyst bed output gas temperatures are the intercept temperatures calculated in Sections 12.2, 15.2 and 16.3.

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