The invention concerns a method for converting hydrocarbon-containing gases into hydrocarbon-containing liquids which consists in: a) producing a syngas from the hydrocarbon-containing gases, b) treating the syngas using Fischer-Tropsch process to obtain hydrocarbon-containing liquids and a residue gas comprising at least hydrogen, carbon monoxide, carbon dioxide and hydrocarbons, c) treating the residue gas using a separation process producing at least one gas stream comprising hydrogen and carbon monoxide, d) subjecting said gas stream to a reaction of carbon monoxide vapor oxidizing reaction so as to convert CO into hydrogen and CO2, and mixing the effluent gas derived from the carbon monoxide vapor oxidizing reaction with the syngas derived form step a).
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