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The equilibrium between the solid and gas phases has been studied, using the flow method. The pressure varied from 1.3 atm up to 50 atm. The composition of the gas phase has been determined by means of the solidification of N2 (or CO) with the aid of liquid hydrogen. The most favourable conditions for the purification of hydrogen were deduced from the experimental results with respect to the binary mixtures H2−N2 and H2−CO. The agreement between theory and experiments proved to be satisfactory. The behaviour of the ternary mixture H2−N2−CO is shown in the corresponding diagrams.