KINETIC REGULARITIES OF THE LIQUID-PHASE HYDROGENATION OF AROMATIC NITRO-COMPOUNDS ON SUPPORTED POROUS CATALYSTS AT A NORMAL HYDROGEN PRESSURE

Experimental data on the kinetics of the hydrogenation of aromatic mon onitro compounds in a flow gradientless reactor is analyzed. Equations describing the stage process of the conversion of the starting nitro compound into the corresponding amine via the intermediate arylhydroxy lamine in the presence of supported porous catalysts of the Pt group a t a normal hydrogen pressure are obtained, allowing for the internal d iffusion of the reagents in the pores of the support particles. The ef fective rate constants and other rate law parameters are determined. I t is shown that the reduction proceeds in the region controlled by hyd rogen diffusion in the pores of the catalyst particles until the start ing nitro compound is completely consumed. The transition into the kin etic region is possible on the catalysts with low metal contents (belo w 0.2-0.3%) with a particle size of less than 100 mu m.