METHOD OF EXTRACTING AND COMPRESSING HYDROGEN FROM EXHAUST GASES OF NATURAL GAS PYROLYSIS Russian patent published in 2024 - IPC C01B3/50 C01B3/58 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to a method of extracting and compressing hydrogen from waste gases of pyrolysis of natural gas, during which after separation of technical carbon and drying off gases of pyrolysis of natural gas, which are dry pyrolysis gas, which includes hydrogen and carbon monoxide, is subjected to cooling in a heat exchanger, after which the cooled dry pyrolysis gas is directed to a gas preparation unit, where cooled dry pyrolysis gas is first passed through fine filters to trap residual solid particles, then cooled dry pyrolysis gas cleaned from residual solid particles is directed to catalytic reactor included in gas treatment unit for subsequent methanation of carbon monoxide, which is part of cooled dry pyrolysis gas, on a nickel catalyst, during which carbon monoxide is hydrogenated with a portion of the cooled dry pyrolysis gas hydrogen to form methane and oxygen and subsequent reduction of oxygen to water, which is further subjected to additional drying, after which the cooled dry pyrolysis gas, from which carbon monoxide has been removed, is directed after the gas preparation unit into a reactor with a metal hydride filler, in which hydrogen is sorbed, which is part of cooled dry pyrolysis gas, at that, non-sorbed impurity gases separated from sorbed hydrogen, including methane, due to pressure of cooled dry pyrolysis gas flow supplied to reactor inlet from gas preparation unit are partially displaced and taken for utilization, then, upon completion of the sorption process, the remaining impurity gases are displaced by a counter flow of pure hydrogen entering the reactor under pressure, after which, in the same reactor, hydrogen is desorbed by heating, as a result of which hydrogen is compressed, note here that hydrogen is extracted and compressed continuously using two or more identical reactors.

EFFECT: higher purity of compressed hydrogen, as well as minimization of losses.

1 cl, 1 dwg