Distillation research and models
I have worked on distillation (both batch and continuous)
since about 1980 -- on design
(steady-state), modelling, dynamics and control.
If you do not know much about distillation, then the following paper
dealing with the steady-state behavior and
design of continuous distillation may be useful:
The following paper covers control of distillation columns:
In addition, the following paper provides an introduction to dynamics
and control of distillation columns:
The following paper covers the literature up to about 1991 very well:
- I.J. Halvorsen and S. Skogestad,
Encyclopedia of Separation Science.
In: D. Wilson (Editor-in-chief), Academic Press, 2000.
A lot of our work has been related to the dynamics and control of
"Column A" (41 stages;, relative volatility 1.5; 99% purity;
liquid flow dynamics; constant pressure):
In addition, there are some other column models:
- colamod.m The basic dynamic
Matlab model for column A (more details below).
A very simple model with 3 stages + total condenser.
A model for closed operation (F=0, D=0, B=0) (binary mixture, two vessels).
- multicomA.m (ORIGINAL VERSION, 2003).
A model for a column with any number of components (extension of
colamod.m to NC components - still ideal mixture)
- multicomA.m (NEW VERSION, MARCH 2008).
Also Simulink and steady-state
A model for 3 components and nonideal Wilson or Uniquac liquid activity (extension of
colamod.m to nonideal mixture)
- OLD: dist5.m
A model for a column with varying reboiler and condenser holdup,
but constant stage holdup.
With PI-controllers in top. Works for closed operation (F=0)
- OLD: colap.m A first attempt at a
MATLAB model for a column with pressure variations.
- Models with varying pressure and neglected
vapor holdup written by Hilde Engelien
- fenske.f Steady-state model of binary distillation
column based on assumption of constant molar flows and constant relative
volatility (Fortran program).
linemcmodel.mat Linear model of 5x5 column of Lundstrom in mutools
format. See distillation mailbox for more details.
Petlyuk column Dynamic model of Petlyuk column made by Ivar Halvorsen
Speedup files of B. Wittgens on multivessel batch distillation and
Speedup and Matlab files of E.H. Hilmen on batch distillation of nonideal mixtures
Speedup file of P. Lundstrom of 5x5 distillation model with varying
pressure and vapor holdup included
More information on MATLAB Distillation column model ("Column A")
You can here find nonlinear and linear dynamic models of a distillation
column for use with MATLAB and/or SIMULINK. The models are for the
4x4 "open-loop" (uncontrolled) column, as well as for the LV, DV,
The following assumptions are used:
Binary mixture; constant pressure; constant relative volatility;
equlibrium on all stages; total condenser;
constant molar flows; no vapor holdup;
linearized liquid dynamics, but effect of vapor flow ("K2"-effect) is included.
These assumptions may seem restrictive, but they capture the main
effects important for dynamics and control (except for the assumption
about constant pressure).
The column has 40 theoretical stages and separates a binary mixture
with relative volatility of 1.5 into products of 99% purity.
It is relatively easy to change the model parameters and to simulate