Study of reactor modeling in the process of aniline synthesis. Every year the demand for aniline is growing all over the world, and, accordingly, the capacity of its production. The areas of consumption of this product are different: the production of isocyanates used in the industry of building materials (foams, decorative parts, pipe insulation, etc.), in the shoe industry, additives to motor fuels; production of pharmaceutical preparations; organic dyes and pigments; herbicides.The object of study of this work is an industrial reactor related to shell-and-tube vertical apparatuses.The purpose of this work is to improve the process of synthesis of aniline using a mathematical model.The parameters of the equations describing the rate of the aniline synthesis process are determined; a mathematical model of an industrial reactor was developed taking into account the strong exothermicity of the aniline formation reaction.A computer model of the aniline synthesis reactor was developed, the adequacy of which was confirmed experimentally, allowing to determine the values of output characteristics in a wide range of changes in technological and design parameters; the influence of technological and design parameters on the process of aniline synthesis was studied. Based on the results of scientific research, 2 abstracts of conferences were published. Beginning in the early 1970s, American Cyanamide (USA) developed an original technology to produce aniline through the ammonolysis of benzoic acid. Benzoic acid was reacted with aqueous ammonia solution in the presence of cupric oxide at 215-220 °C and 3.5-4.2 MPa. Benzoic acid is produced according to known technology through the liquid phase oxidation of toluene with the help of cobalt salts at a temperature of 130-140 ° C and 0.21-0.22 MPa under strong heat removal conditions. Keywords: aniline synthesis. aniline production parameters, mathematical model of the reactor.