OP-II-3

PP-II-31isobutylene in butene fraction is reasonable from the simplification of dynamic modelpoint of view, because n-butene does not participate in the chemical reaction.However, presence of n-butene in reactive mixture has significant influence on phaseequilibrium of the system. In view of the fact that the ratio isobutylene : n-butene inthe reactive mixture reaches 1 : 3, the influence of n-butene on VLE can significantlychange the process in general. We suppose that the research of n-buteneconcentration influence on the activity coefficients is the most interesting.Hence, one of the aims of this work is researching VLE in “Isobutylene – n-butene- methanol - MTBE” system and obtaining the empiric dependencies used for thecombined processes control algorithms (Table 1).Table 1 – Empirical correlations between the activity coefficients and the temperature andthe concentration of all components in “Isobutylene – n-butene - methanol - MTBE” system.i−bun−buMeOHMTBElnγ = −0.275x+ 0.585x−1.543x+ 0.019T− 6.3771n−bun−buMeOHMTBElnγ = −0.29x+ 0.56x−1.536x+ 0.0185T− 6.2661MeOHi−bun−buMeOHMTBElnγ = 15.12x+ 15.22x+ 13.69x+ 12.7x−0.015T−7.40,9939MTBEi−bun−buMeOHMTBElnγ = 3.53x+ 2.64x+ 3.35x+ 1.42x+ 0.0007T−5.30,9902This result is used for dynamical mathematical model of the process, which isconsist of MEH equations. The model enables to provide quality control, andprediction of process behavior under disturbances.References[1]. Gruner S. et al. Nonlinear control of a reactive distillation column // Control Engineering Practice11. – 2003;[2]. Yang Bolun et al. Multiplicity Analysis in Reactive Distillation Column Using ASPEN PLUS //Chinese J. Chem. Eng. - 2006;[3]. Singh B.P. Steady State Analysis of Reactive Distillation Using Homotopy Continuation //Chemical Engineering Research and Design. – 2005.R2389