Thermodynamic analysis of multicomponent distillation columns: identifying optimal feed conditions

Brazilian Journal of Chemical Engineering. 2000;17(4-7):751-760 DOI 10.1590/S0104-66322000000400038

 

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Journal Title: Brazilian Journal of Chemical Engineering

ISSN: 0104-6632 (Print); 1678-4383 (Online)

Publisher: Brazilian Society of Chemical Engineering

LCC Subject Category: Technology: Chemical technology: Chemical engineering

Country of publisher: Brazil

Language of fulltext: English

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AUTHORS

M. L.O. Maia
R.J. Zemp

EDITORIAL INFORMATION

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Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

A new methodology for the optimisation of feed conditions as well as the calculation of minimum reflux ratio of distillation columns is presented. The reversible profile approach used for saturated liquid feeds is extended to consider other feed conditions. For flashed feed, the liquid fraction of the feed stream is used to compute the column pinch conditions and the minimum reflux ratio. The modifications required for subcooled liquid and superheated vapor feed are discussed, and a procedure to estimate the minimum reflux for those conditions is proposed. The methodology presented allows the identification of the optimal feed condition, without having to resort to a full stage-by-stage procedure.