Subject: Re: Using Distillation Column Model in Inferentials Course


Use of temperature measurements to estimate compositions should work fine -
actually without any need to know thermo - just using PLS or similar to
regress steady-state data from simulations or from the real plant.

We have used this on theoretical data on a pilot-plant column and on a
real column. 

Please see these references:


1. @ARTICLE{mejdell:91,
          author  =      "Mejdell, T. and Skogestad, S.",
          title   =      "Estimators for Ill-Conditioned Plants:
                  High-Purity Distillation",
          journal =      "Preprints ADCHEM '91",
          year    =      1991,
          pages   =       403-408,
          annote  =       {Estimation, Distillation columns,
                   Large-scale systems, Data reduction, Kalman filters,
                   Inferential control, Multivariate calibration, Input
                   uncertainty, Robust control, Temperature control}

2.
@ARTICLE{mejdell:93-1,
          author  =      "Mejdell, T. and Skogestad, S.",
          title   =      "Output Estimation Using Multiple Secondary
                  Measurements: High-Purity Distillation",
          author  =      "AIChE Journal",
          year    =      1993,
          pages   =      1641-1653
}

3. \item T. Mejdell and S. Skogestad, ``Estimation of Distillation Compositions
from Multiple Temperature Measurements using Partial-Least-Squares
Regression'', {\it Ind. Eng. Chem. Res.}, {\bf 30}, 12 , 2543-2555 (1991).

4. \item T. Mejdell and S. Skogestad, ``Composition Estimator in a Pilot Plant
Distillation Column using Multiple Temperatures'', {\it Ind. Eng. Chem. Res.},
{\bf 30}, 12, 2555-2564 (1991).

5.
@Article{mejdell:94,
   author =      {Mejdell, T. and Andersson, B-O.},
   title =       {Using Temperature Profile for Product Quality
                   Estimation on a Distillation Column},
   journal =     {Reprinted from ISA Transactions},
   year =        1994,
   volume =      33,
   pages =       {27-34},
   annote  =      {Estimation, Chemometrics, Process control,
                   Distillation column}  
}