Modeling and approval of vinyl acetate synthesis process from acetylene

MODELING AND APPROVAL OF VINYL ACETATE SYNTHESIS PROCESS FROM ACETYLENE


Musulmonov Noryigit Hasanovich
Nazarov Bekzod G‘ulom o‘g‘li
Associate Professor of the Department of Chemistry of the Uzbek-Finnish Pedagogical Institute, Samarkand, Uzbekistan. https://orcid.org/0000-0002-2092-3115
E-mail: [e-mail]


ANNOTATION


The work is devoted to the development of a mathematical model and identification of parametric coefficients of the model of the process of vapor-phase acetylation of acetylene on a supported Zn-Cd/VAC catalyst. A mathematical model of the process was obtained that takes into account changes in the activity of the catalyst. It is shown that the model describes well the experimental data obtained at the pilot reactor. Based on the condition of the maximum permissible parametric sensitivity, the inner diameter of the tube was calculated. The process has been optimized. The income of vinyl acetate production was taken as an optimization criterion. To solve the problem, the maximum principle was used. The optimal regimes for changing temperature, molar excess of acetylene and linear speed of the reaction mixture over time were found. The optimal temperature profile along the length of the reactor is isothermal. An analysis of the influence of restrictions on control parameters and the type of criterion on optimal modes was carried out. The optimal duration of catalyst operation was determined - 45 days.
Methods and software have been created for calculating catalytic processes that occur with a noticeable change in the reaction volume. The results of modeling the main stages of catalyst preparation and operation: reduction, passivation, deactivation and regeneration are presented. At almost all stages studied, a noticeable change in the mass of the catalyst occurs. Mathematical models of catalytic processes, including kinetic ones, have been created, which make it possible to interpret experimental observations and provide an understanding of the nature and characteristics of reactions and processes. Mathematical models are a system of equations for material and heat balances, kinetic equations, expressions for the rate of transfer of matter and heat, i.e. constructed taking into account the physical and chemical laws of the process.