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HETP Evaluation of Structured and Randomic Packing ...
3 HETP Evaluation of Structured and Randomic Packing Distillation Column Marisa Fernandes Mendes Chemical Engineering Department, Technology Institute, Universidade Federal Rural do Rio de Janeiro Brazil 1. Introduction Packed columns are equipment commonly found in absorption, distillation, stripping, heat exchangers and other operations, like removal of dust, mist and odors and for other purposes. Mass transfer between phases is promoted by their intimate contact through all the extent of the packed bed. The main factors involving the design of packed columns are mechanics and equipment efficiency. Among the mechanical factors one could mention liquid distributors, supports, pressure drop and capacity of the column. The factors related to column efficiency are liquid distribution and redistribution, in order to obtain the maximum area possible for liquid and vapor contact (Caldas and Lacerda, 1988).
Cornell et al. (1960) published the first general model for mass transfer in packed columns. Different correlations of published data of H L and H V , together with new data on industrial scale distillation columns, were presented to traditional packing, such as Raschig rings and
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