Mass transfer resistance in liquid phase during evaporation of liquid solutions in thinlayerevaporator may substantially influence on the results of the process of distillation.Theoretical approach, which is commonly used in designing practice, leads in suchcases to wrong estimation of heat transfer area, necessary for obtaining anticipatedpurity of the products or even worse, it could give results of distillation that areunrealistic taking into account the composition of distillate. The authors of the paperperformed an extensive experimental work on distillation of solutions possessingcomponents with substantially different volatility. They applied a thin-layer evaporatorof static type and the evaporator equipped with blades that mixed evaporated liquid.The results of work lead the authors to conclusion that the mass transfer resistance inliquid phase depends on properties of evaporated liquid, its composition as well as theconstruction of the evaporator and the process conditions.
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