Doherty [1] introduced the concept of differential equations (DE's) as a shortcut design tool to determine the composition profiles along the length of the rectifying and stripping sections in a distillation column. Each section has a differential equation that describes the change of liquid composition along the column section. Equimolar overflow is assumed for simplicity, although the analysis can be extended to include non constant molar overflow. The advantage of this model is that it allows finite reflux ratios (reboil ratio) to be analysed. A differential equation model for the stripping section of the columm.
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