ДОСЛІДЖЕННЯ КІНЕТИКИ ПРОЦЕСУ ОКИСНЮВАЛЬНОГО АМОНОЛІЗУ МЕТАНУ

Abstract

The main results of research of the kinetics of the process of methane oxidative ammonolysis are presented. Industrial production of hydrogen cyanide is the basis for the production of one of the important components for gold production – sodium cyanide. Now, the main method of production of sodium cyanide is based on the neutralization of hydrocyanic acid, obtained by catalytic synthesis of methane, ammonia and oxygen in a platinum catalyst, by alkali solution. The purpose of the investigation is to research kinetic parameters of the process of methane oxidative ammonolysis, namely to determine the dependence of contact time and reaction rate on technological parameters of the process. It is known that the content of platinized metals in the catalyst, as well as the number of nets in the package and its surface development, have the greatest influence on the process of methane oxidative ammonolysis. It is established that with the reduced content of the one of reagents in the initial gas mixture, namely NH3, after cyanide hydrogen synthesis reactor, a considerable amount of unreacted components of the mixture is present in contact gas. The time of the contact for platinum nets for different developed surfaces at different pressures and constant temperature of 1193 K is calculated. The number of nets in the platinum catalyst package have the greatest influence on contact time. It is proved that with increasing a linear velocity of the gas stream, the cyanide hydrogen output is increased. Based on the experimental data, the rate of the reaction of HCN formation and the flow of the diffusion process in the first order are determined. At a volumetric ammonia concentration 10,75 % vol., the rate of the reaction of cyanide hydrogen formation is 0,75 s.