This monograph is devoted to the one-step production of ethylene by oxycondensation of methane and reflects the results of the research carried out under the state grant OT-12A-46. The monograph summarises the results of a large number of scientific researches carried out in our country and abroad on the extraction of ethylene from methane, as well as on the reaction mechanism, kinetics, technology of ethylene extraction, etc. The monograph is intended for masters in the field of ethylene production.The monograph is intended for masters, Ph.D. students, scientific researchers, scientific and technical workers and chemical engineers working in this field.