Design and Control Properties of Arrangements for Distillation of Four Component Mixtures Using Less Than N-1 Columns

摘要

The design and study of dynamic properties of distillation sequences using side-stream columns with less than N-1 columns for separation of four-component mixtures were studied.Total annual cost and dynamic properties(using singular value decomposition)were used to compare properties of arrangements with less than N-1 columns to base cases with three columns(conventional case).Quaternary feeds containing four hydrocarbons were analyzed.For systems with low concentrations of one component in the feed,side-stream cascades often show significantly lower operating,capital costs and best dynamic properties compared to the base cases.Low purity requirements also favor side-stream cascades.Some rules are presented to predict which sequence will have the lowest energy consumption capital cost and better dynamic properties.