The alkylation process is complementary to the catalytic cracking process. These processes are one of the most important in the manufacture of petroleum products. Therefore, it is advisable to increase the efficiency of production and development of a control system for the process of alkylation of benzene with propylene in the liquid phase.To compile a mathematical model of the alkylation process, taking into account the physico-chemical features of the process, it is necessary to have an idea of its mechanism. Alkylation reactions are exothermic and lead to the appearance of mono- and polyalkylation products, accompanied by side reactions of isomerization, polymerization and depolymerization. In the alkylation of aromatic hydrocarbons, in particular benzene, the greatest industrial value is aluminum chloride AlCl3, which has a number of significant advantages over other catalysts. However, it has been established that in the presence of AlCl3 in the composition of the catalytic complex, ternary complexes can be formed not only with one, but also with two, three and so on hydrocarbon radicals. Complexes can enter into metabolic reactions not only with benzene, but also with the reaction products, for example, with dipropylbenzene, then there is a process of alkylation and there are a significant number of side reactions. As a result of these reactions, the value of the preexponential multiplier and the activation energy in the Arrhenius equation change. And the activity of the catalyst with the time of operation is often reduced and this significantly affects the final product. In this work, the actual values of the specific conductivity of the catalyst were normalized in the range from 0 to 1.As a result of processing a large array of experimental data, it was found that the maintenance of the activity of the rotary catalyst complex is regulated by the consumption of fresh catalyst and as a result depends on the consumption of the rotary catalyst, its activity and the activity of fresh catalytic complex.The experience of using optimal systems according to the quadratic quality criterion has shown their sensitivity to the process parameters of a real object. Such systems turned out to be rude, which leads to their loss not only of optimality, but also of stability and quality.It is proposed to create a control system that would take into account these parametric uncertainties.The synthesis of a robust regulator allowed to take into account all the unpredictable disturbances that affect the process while improving the quality of the product, its speed and optimal use of the catalytic complex. And since the alkylation processes are similar, this control system can be used for other mathematical models of the process.Synthesis of a robust regulator in the process of alkylation of benzene by propylene in the liquid prase