Compute the amount of sulfuric acid 98% required to absorb 99.9% of the SO3 in the gases from the third catalytic bed (see Table P7.9), and the acid temperature. The product has a composition of 99%, the gases are at 200C, and the acid is fed at 90C. The unabsorbed gases exit at 90C and we remove 6500 kcal/s using cooling.

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Table P7.9 Gas Composition Exiting 3rd Bed SO N 02 SO 3rd Bed (kmol/s) 0.01071494 0.79 0.06535747 0.08928506 0.95535747