Shortcut Method for Multiple Task Batch Distillations

SILVINA D. ZAMAR; OSCAR IRIBARREN,; ENRIQUE SALOMONE

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

American Chemical Society

Lugar: Washington, USA; Año: 1998 vol. 37 p. 4801 - 4807

0888-5885

A methodology is presented for the preliminary design of separation networks of batch distillation.Analytical partition functions are derived based on the assumption that the distribution ofcomponents in an actual batch distillation can be approximated by the distribution of a batchcolumn at total reflux. This permits computation of mass balances of multiple separationnetworks (allowing recycle of intermediate cuts) by solving a linear system of equations. Oncethe composition of the feeds to each separation task is known, the reflux ratios required to perform the tasks can be computed by using a previously developed method that relates the minimum to the actual reflux ratios and number of stages. The validity of the assumption is tested against simulation and the methodology compared with previously reported short-cut approaches. Since no new simplifications are introduced to the model, the reduction in computation effort is achieved with the same overall accuracy