Page 227 - Separation process principles 2

192 Part 2 Separations by Phase Addition or Creation

Pressure-swing distillation involves use of two columns in several process simulators. These models are partic-
operating at different pressures. Reactive distillation ularly useful in cases where stage efficiency is low or
strives to couple a chemical reaction with separation uncertain and are described in Chapter 12.
of the products. Included in Chapter 11 is supercritical- Batch distillation has become increasingly popular
fluid extraction, which makes use of the favorable with the trend toward production of specialty products.
properties in the vicinity of the critical point to achieve Calculation methods, widely used in process simula-
a separation. tors, for both binary and multicomponent mixtures are
Mass-transfer models for multicomponent, multi- presented in Chapter 13, with an introduction to meth-
stage, vapor-liquid separation operations are available ods for determining an optimal set of operation steps.