JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
Distillation Calculation by Multistage Relaxation Methods
Hideki MoriIkuho YamadaTsutomu AragakiYoshiaki KondoFang-Zhi LiuToshihiko Tsuiki
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1990 Volume 23 Issue 3 Pages 269-274

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Abstract

Multistage relaxation methods are proposed for solving nonideal multicomponent distillation problems involving multiple feeds and side-cut streams. In the present work, two-stage and three-stage relaxation algorithms are developed from a single-stage relaxation algorithm with simultaneous correction of liquid composition and temperature.
From a feasibility study using numerical examples, the two-stage relaxation method is recommended since the effect of the formulation complexity on the improvement of convergence is higher than that of the three-stage method.

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© 1990 The Society of Chemical Engineers, Japan
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