Study of the Equilibrium of Heterophase Reactions in the Gas–Liquid System Using Hydrogenation of the Carbonyl Group in Ketones

• Published in: Russian journal of applied chemistry 2022-09, Vol.95 (9), p.1354-1363
• Main Authors: Karalin, E. A., Elimanova, G. G., Oparkin, A. V., Krupin, A. S., Kharlampidi, Kh. E.
• Format: Article
• Language: English
• Subjects: Absorption; Carbonyl groups; Carbonyls; Chemical reactions; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Cyclohexanone; Dissolution; Endothermic reactions; Enthalpy; Exothermic reactions; Gas-liquid systems; Hydrogenation; Industrial Chemistry/Chemical Engineering; Ketones; Organic Synthesis and Industrial Organic Chemistry; Reagents; Thermal simulation; Thermodynamic equilibrium; Thermodynamics
• ISSN: 1070-4272; 1608-3296
• DOI: 10.1134/S1070427222090105

A comparative evaluation of the results of an experimental study and thermodynamic analysis of the chemical equilibrium in a heterophase heterogeneous catalytic reaction of cyclohexanone hydrogenation is reported. It is shown that when calculating the thermodynamic equilibrium constant of heterophase hydrogenation reactions in gas–liquid systems it is necessary to take into account the change in the enthalpy and entropy of the initial chemical system caused by hydrogen absorption. The value of the enthalpy of hydrogen absorption not only reflects the endothermic physical process of gas dissolution, but also characterizes the state of the reagents in the exothermic chemical reaction of hydrogenation. Therefore, the thermal simulation of the apparatus, in which gas absorption and chemical reaction with its participation occur simultaneously, should be performed without taking into account the heat of gas dissolution.