Absorption towers single contact

The earlier version of this contact process was known as the single contact single absorption process as the SO2 was passed through the converter to produce SO3 which was then absorbed in a single absorption tower. 

Table 9.3 Absorption tower details. The data are for single contact plants or first (intermediate) contact in double contact plants.

Figure 23.1 Simplified single contact sulfuric acid production flowsheet. Its inputs are moist feed gas and water. Its outputs are 98 mass% H2SO4,2 mass% H2O sulfuric acid and dilute SO2, O2, N2 gas. The acid output combines gas dehydration ( drying ) tower acid, H2SO4 making ( absorption ) tower acid, and liquid water. The equivalent sulfur burning acid plant sends moist air (rather than moist feed gas) to dehydration. Appendix V gives an example sulfur burning calculation.

Figure 24.1 Figure 23.1 s single contact absorption tower. Its quantities, temperatures, and gas compositions are used in Sections 24.1 and 24.2 calculations. The molar quantities are all per kg mol of Section 23.3 s first catalyst bed feed gas. The calculations assume that all input SO3 reacts to form H2S04(f). Note that output gas temperatureacid temperature. 

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