The aromatization reaction of a propane-rich propane-butane mixture on an HZSM-5 catalyst modified with chromium and zinc ions has been studied in a flow reactor at temperatures in the range of 530-640 degrees C. Kinetic modeling of the process as a heterogeneous catalytic reaction was performed using the experimental data obtained under conditions of unfeasibility of simultaneous maintenance of temperature and space time in each kinetic experiment. The approach proposed has made it possible to reveal the scheme of conversion of the propane-butane reactants to aromatic hydrocarbons, develop a kinetic model of the process, and find its parameters to ensure an adequate mathematical description of the experimental data.