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University of Tuzla, Faculty of Technology Tuzla, Department of Chemical Engineering , Tuzla , Bosnia and Herzegovina
The semi-rigorous model without holdups and the semi-rigorous model with minimum holdups give almost the same results. However, the former uses integration step 0.1 h and the latter integration step 0.00001 h. This, and the fact that a semi-rigorous model describes the dynamics of the batch distillation process more reliably than a shortcut model, makes the semi-rigorous model without holdups more suitable for dynamic optimization of the process. For the calculation of the composition in the condenser, at each step of time, a modified Levenberg-Marquardt method is used. The computer implementation of the above algorithm is performed in the FORTRAN programming language. Imposing the constraints is avoided by introducing the composition normalization.
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