A nonequilibrium stage model of countercurrent separation processes is used to predict composition and temperature profiles during binary and multicomponent distillation in wetted-wall and bubble-cap-tray columns. The profiles predicted by the model are compared with experimental data for the binary systems benzene-toluene, ethanol-water, and acetone-chloroform and for the ternary systems benzene-toluene-ethylbenzene, acetone-methanol-water, methanol-isopropanol-water, acetone-methanol-ethanol, and benzene-toluene-m-xylene. The model does a very commendable job of predicting the composition profiles measured for these systems; average absolute differences between predicted and measured mole fractions are seldom greater than 4 mole percent and are often very much less.
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