A globally convergent method for finding all steady-state solutions of distillation columns

A Survey for the Selection of Control Structure for Distillation Columns Based on Steady State Controllability Indexes

Dynamic Simulation of Distillation Sequences in Dew Pointing Unit of South Pars Gas Refinery

The understanding of the dynamic behavior of distillation columns has received considerable attention because distillation is one of the most widely used unit operations in chemical process industries. This paper reports a dynamic simulation study of the possible distillation columns sequences of Dew pointing unit in the second phase of South Pars Gas Refinery. In this unit, three columns are u...

Robustly finding all solutions to nonlinear systems of equations

This paper focuses on finding all solutions to nonlinear algebraic systems of equations in a given domain. First, scattered points are computed that can be considered as a representative sample of the solution manifold of a given underdetermined nonlinear system of equations. If this underdetermined system is then augmented by further equations such that the system becomes well-defined, the sam...

Reliable Computation of Equilibrium Cascades with Affine Arithmetic

Computing the steady state of multistage counter-current processes like distillation, extraction, or absorption is the equivalent to finding solutions for large scale non-linear equation systems. The conventional solution techniques are fast and efficient if a good estimation is available but are prone to fail, and do not provide information about the reason for the failure. This is the main mo...

Economic Optimization of the Reflux Ratio of Two Components Stage Distillation Columns

Distillation columns are complex processes for modeling and controlling. These columns are significant parts of most chemical industries for separation of components. Control of this process is essential for achieving certain purity for products with a minimum cost. However, nonlinearities, multivariable interaction, non-stationary behavior and severity of disturbances inside the column made th...