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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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D. Problems

*Answers to problems with an asterisk are at the back of the book.

D1. We plan to wash dilute sulfuric and hydrochloric acids from crushed rock in a counter current system. Operation is at 25°C and one atmosphere. 100.0 m3/day of wet rock are to be washed. After settling, the porosity is constant at 0.40. Thus, the underflow rate is 40.0 m3/day. The initial concentration of the underflow liquid is 1.0 kg sulfuric acid/m3 and 0.75 kg hydrochloric acid/m3. We desire an outlet underflow sulfuric acid concentration of 0.09 kg/m3. The wash liquid (overflow) rate is 50.0 m3/day, and the inlet wash water is pure. For these dilute solutions assume that the solution densities are constant, and are the same as pure water, 1000.0 kg/m3. Find: ...

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