Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-III-22reactor wall from the two-dimensional model [Ошибка! Закладка не определена.].Temperature mode optimization within the framework of the developed mathematical modelincluded variation of the following parameters: temperature of the reaction gases incomingflow, reactor wall temperature, temperature in the center of the catalytic bed, catalytic bedporosity, and degree of dilution of the catalyst by inert support.In Figure 1 one can see the calculation of the reactor temperature mode, satisfactorilydescribing the experimentaldata with respect to the valueand position of the «hot zone»of the catalytic bed as well asthe main parameters of theprocess: ethylene glycolconversion, glyoxal yield andselectivity, and CO and CO 2yields.Figure 1: calculation of the reactor temperature mode and main parameters of the processPredicting calculations were performed for two variants of the organization of thecatalytic bed, providing the given productivity of the reactor: (1) variation of the catalyst bedheight at constant reactor tube diameter; (2) variation of the reactor diameter at minimal valueof the catalyst bed height.It was shown that the mathematical model developed for both variants allows optimizingthe bed height and dilution of the catalyst, providing acceptable temperature mode for thecatalyst bed (less than 650 °С at the «hot zone») as well as the given values of the ethyleneglycol conversion (100 %), and selectivity with respect to glyoxal (90-92 %). The modeldeveloped satisfactorily describes the experimental data obtained with using of the laboratoryreactor. This allows predicting the effective temperature modes of the realization of theethylene glycol oxidation process in the preassembled catalytic reactor.AcknowledgementsThis work was supported by the Grant of the President of the Russian Federation№YD-968.2007.3 and the Grant of Tomsk region Administration № 336.References1. Vodyankina O.V., Kurina L.N., Boronin A.I., and Salanov A.N., Stud. Surf. Sci. Catal. 130B (2000) 1775.2. A.G. Dixon, D.L. Cresswell. Theoretical prediction of effective hest transfer parameters in packed bed.AIChE Journal, V.25, N.4, pp.63-676, 1979.3. A.G. Dixon. An improved equation for the overall heat transfer coefficient in packed beds. Chem. Eng.Process., V.35, pp.323-331, 1996.134