KINETICS OF LIQUID-PHASE CYCLOHEXANONE AMMOXIMATION OVER A TITANIUM SILICATE

Liquid-phase cyclohexanone ammoximation over titanium silicate was car ried out in a batch reactor. The influence of the solvent, duration of kinetic run, catalyst amount and reactant concentrations was investig ated. Byproducts were formed in considerable amounts, leading to catal yst deactivation by pore blocking. The values of initial reaction rate s were calculated taking into account deactivation phenomenon. These v alues indicated that within the range of studied concentrations (C-cyc lohexanone = 0.4 to 1.70 mol/l; C-ammonia = 1 to 4 mol/l; C-hydrogen p eroxide = 0.4 to 1.8 mol/l) the reaction rates plotted as a function o f all the reagent concentrations go through a maximum. Special experim ents on hydrogen peroxide decomposition and cyclohexanone oximation by hydroxylamine demonstrated that the rates of these reactions are esse ntially higher than the ammoximation rates.