A Short-Cut Approach for the Design of Batch Stripping Distillations

S. XU; ENRIQUE SALOMONE; OSCAR IRIBARREN,

LATIN AMERICAN APPLIED RESEARCH

Universidad Nacional del Sur and CONICET

Lugar: Bahia Blanca, Argentina; Año: 2001 vol. 31 p. 261 - 265

0327-0793

Batch stripping distillation is different from the conventional batch distillation (which is actually a rectification column) in that the holding vessel feeds the top while the products leave the column from the bottom. The batch stripper is convenient for separating mixtures with small amounts of light components by removing the heavy components as bottom product. In thispaper we present a shortcut design procedure for the batch stripping distillation, based on our earlier work in Salomone et al (1997) and Zamar et al (1998) on batch rectification, which is equivalent to the Fenske-Underwood-Gilliland procedure for continuous distillation. Given a separation task, we propose to compute the minimum number of stages Nmin and minimumreboil ratio Rbmin required to perform it by batch stripping. We propose them to be computed as the number of stages and reboil ratio required by a hypothetical batch stripping column operating at total reboil ratio or having an infinite number of stages, respectively. Then, it is shown that the performance of batch stripping columns with a finite number of stages and reboil ratio, does correlate in Gilliland coordinates constructed with these minimum stages Nmin and minimum reboil ratio Rbmin.