It is desired to prepare a 25C aqueous solution of potassium sulfate containing 0.12 g K2SO4/g solution in an agitated 60 in. diameter stainless steel reactor. Calculate: a. The solid-liquid mass transfer coefficient at Njs, the minimum impeller speed required to suspend the potassium particles completely. b. The rate of dissolution of the solids at Njs.

It is desired to prepare a 25C aqueous solution of potassium sulfate containing 0.12 g K2504/g solution in an agitated 60 in. diameter stainless steel reactor. Calculate: (a) The solid-liquid mass transfer coefficient at Nis, the minimum impellerspeed required to suspend the potassium particles completely. (b) The rate of dissolution of the solids at Nis. Solid loading 0.05 g/cm of solid free liquid Solution viscosity 1.01 CP or 0.00101 kg/m.s Solution density 1.08 g/cm or 1080 kg/m K2SO4 density 2.66 g/cm or 2660 kg/m? K2SO4 particles size 324 pm or 0.000324 m Solubility of K S04 0.12 g/g of solution Bulk concentration 0.09 g K2SO4/g solution Diffusivity of K2SO4 in water 9.9 x 10-6 cm/s