CHEN 3006 Lecture 48: 2015_4_27 Lecture.pdf

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Imagine a broth with 200 mg/k extracted with. L = 37 l/hr g = 450 l/hr m = 0. 018 need 99% recovery. G is entrained solvent flow rate using this part to figure out the number of stages. Recover 99% of gold from dry feed with 80 ppm gold pure solvent 5 kg/kg dry solid, entrained 2 kg solvent/kg dry solid. We"re doing ideal stages here b/c we already went through nonideal equilibria. Kremser eqns: we"re feeding pure solvent, so y0 = 0 entrained fluid has same composition as extract --> yn = xn. L = 5f (this comes from the 5 kg/kg dry solid) if we choose f = 1 kg solid, then l = 5 kg, x0 = 0 (it"s pure solid) we know g + e = l. G = 2f (comes from the 2 kg solvent/kg dry material) for our basis, g = 2 kg.

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