Mathematical modelling of salt purification by recrystallization. A cross-current flow model and its comparison with the countercurrent arrangement
Collection of Czechoslovak Chemical Communications1986Vol. 51(11), pp. 2489–2501
Abstract
A model is derived for a multi-stage crystallization with cross-current flows of the solution and the crystals being purified. The purity of the product is compared with that achieved in the countercurrent arrangement. A suitable function has been set up which allows the cross-current and countercurrent flow models to be compared and reduces substantially the labour of computation for the countercurrent arrangement. Using the recrystallization of KAl(SO 4 ) 2 .12 H 2 O as an example, it is shown that, when the cross-current and countercurrent processes are operated at the same output, the countercurrent arrangement is more advantageous because its solvent consumption is lower.
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