Invariant Imbedding,Iterative Linearization and Multistage Countercurrent Processes. VII. Distillation Column at Minimum Reflux and Nonlinear Boundary Value Problems.

摘要

The concept of treating multicomponent distillation problems as nonlinear boundary value problems in difference equations is used to solve columns at minimum reflux. Various computational algorithms are formulated based on the choice of different unknown variables and different boundary conditions. To show the quadratic convergence some typical algorithms are illustrated by numerical examples. It is shown that using very rough initial approximations or starting values,four to five digit accuracy is obtained in five to seven iterations.