<p>During the reaction of the solid and the gas phases, solid hydroquinone (HQ) changes its crystal structure while a specific component from mixed gasses is captured into the changed HQ crystal structure. To investigate the partitioning of mixed gasses in the solid phase, the (SF₆ + N₂) gas mixtures having various compositions are used as a gas phase reactant at two experimental pressures, 2.0 and 4.0&#xa0;MPa. In addition, spectroscopic measurements are also performed to obtain qualitative and quantitative information on partitioning of each gas component. From a series of experimental results, it was found that N₂ is exclusively accommodated in the gas-loaded HQ crystal structure, while SF₆ is excluded from the solid crystal structure due to its large molecular size. However, because such partitioning requires high partial pressures of N₂ in the gas mixtures (higher N₂ composition at a given pressure or higher experimental pressure at a given gas composition), N₂ capture in the HQ crystal structure is only observed at 80-mol% N₂ composition at the experimental pressure of 4.0&#xa0;MPa among various gas compositions. The captured amount of N₂ corresponds to 13.7 L at the STP condition per 1&#xa0;kg of HQ. Although N₂ is found to be selectively separated from the binary gas mixtures, further investigations focusing mainly on the reduction of the experimental pressure and the increase of captured N₂ amount are necessary to apply to industrial fields.</p>