An analysis of the literature data indicates a wide front of research and development in the field of the use of methane–hydrogen mixtures as a promising environmentally friendly low-carbon fuel. The conclusion of most works shows that the use of methane–hydrogen mixtures in internal combustion engines improves their performance and emission characteristics. The most important aspect is the concentration of hydrogen in the fuel mixture, which affects the combustion process of the fuel and determines the optimal operating conditions of the engine. When using methane–hydrogen mixtures with low hydrogen content, the safety measures and risks are similar to those that exist when working with natural gas. Serious logistical problems are associated with the difficulties of using the existing gas distribution infrastructure for transporting methane–hydrogen mixtures. It is possible that, despite the need for huge investments, it will be necessary to create a new infrastructure for the production, storage and transportation of hydrogen and its mixtures with natural gas. Further research is needed on the compatibility of pipeline materials with hydrogen and methane–hydrogen mixtures, safety conditions for the operation of equipment operating with hydrogen or methane–hydrogen mixtures, as well as the economic and environmental feasibility of using these energy carriers.

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An original inertial principle of solid and liquid phase separation and the construction of a slurry reactor system on this basis are investigated. A continuous operation reactor system ensures the presence of catalyst in the reaction mixture stays nearly constant while a minimum is withdrawn with the reaction products. The results of hydraulic tests on the developed system, consisting of reactors with volumes of 0.02 and 1.0 m3 and equipped with mechanical agitators, are discussed. The effect of agitation velocity on the velocity of slurry moving in the circulation loop, as well as the extent of withdrawal of solid particles with the clarified liquid stream leaving the reaction system, are investigated in detail. Technical characteristics of the developed reactor system for industrial‐scale Fischer‐Tropsch synthesis, hydrogenation, and other three‐phase processes are discussed.