Abstract: Equilibrium conditions of hydrate formation for the gas mixture of CO2 and N2 with TBAB (tetra-n-butyl ammonium bromide C16H36NBr) and THF (tetrahydrofuran) respectively were determined by employing the pressure search method. The data showed that TBAB and THF could reduce the formation pressure of gas hydrate as the additives. The experiments were carried out in the pressure range of 0.69~14.55 MPa and the temperature range of 275.75~288.15 K. The equilibrium pressures of CO2-N2-TBAB and CO2-N2-THF systems were lower than those of CO2-N2 hydrate at the same temperature. The equilibrium hydrate formation pressure of CO2-N2-TBAB system was lower than that of CO2-N2-THF at the certain temperature with the same low concentration of TBAB and THF. With 2.90%(mol) of the above additives, the equilibrium formation pressure of two systems did not have significant difference.

Key words: equilibrium hydrate formation conditions, TBAB, THF, carbon dioxide, nitrogen

摘要： 利用等温压力搜索法测定了CO2-N2-TBAB与CO2-N2-THF体系的水合物平衡生成压力. 实验的压力范围为0.69~14.55 MPa，温度范围为275.75~288.15 K. 结果表明，TBAB与THF均可作为添加剂有效降低气体水合物的平衡生成压力. 在较低的药剂浓度下，CO2-N2-TBAB的水合物平衡生成压力低于CO2-N2-THF体系. 在较高的浓度下，两种体系的水合物平衡生成压力没有明显差别.

关键词: 水合物平衡生成压力, TBAB, THF, 二氧化碳, 氮气