In modern chemistry pyrolysis is the principal process and large-tonnage provider, primarily, of lower olefins - ethylene, propylene - as well as butadiene, benzene and other products. The level of efficiency of the pyrolysis process largely determines the development of the petrochemical industry in whole, therefore rationalization of the process is an ongoing task of high relevance. The aim of this work is to develop a method for increasing the efficiency of the pyrolysis for lower olefins on the base of the analysis of the mechanism of the process with the possibility of controlling it. The kinetics of the interaction of the hydrocarbons with hydrogen atoms, methyl radicals and their mixtures were determined. The data on the relative reactivity of bonds of different types in reactions with hydrogen atoms and methyl radicals and the data on the effective relative reactivity when using an inert diluent increase our knowledge of the pyrolysis of feedstock of any given composition. A method based on the influence of hydrogen on the thermal reactions of alkanes and alkenes was developed to increase the selectivity of the process for the target product (lower olefins) and to reduce the yield of the liquid products of condensation and specific energy consumption. © 2018 WIT Press.

ACKNOWLEDGEMENTS This research was supported by Act 211 Government of the Russian Federation, contract № 02.A03.21.0006.