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In this communication, clathrate/semi-clathrate hydrate dissociation conditions for the systems containing mixtures of CO₂ (0.1481/0.3952/0.7501mol fraction)+H₂ (0.8519/0.6048/0.2499mol fraction) in the presence of water or 0.05 and 0.30 mass fractions tetra-n-butylammonium bromide (TBAB) aqueous solutions and CO₂ (0.4029mol fraction)+CH₄ (0.5971mol fraction) in the presence of water, 0.05 and 0.3 mass fractions TBAB have been measured and are reported. An apparatus comprising a high pressure equilibrium cell as the main part has been employed for the measurements following the isochoric pressure-search method. The range of conditions for the measurements are 275.5–292.8K up to 15.91MPa. Significant decrease in operating pressure of gas hydrate formation for separation of CO₂ from the corresponding gas mixtures is observed due to the promotion effects of TBAB.