N-甲基咪唑-水/甲醇/乙醇系的气液相平衡

Gas-liquid equilibrium of binary mixtures of N-methylimidazole-water/methanol/ethanol

为了研究N-甲基咪唑分别与水、甲醇、乙醇组成的二元体系的相行为,利用折光率法测量了xN-甲基咪唑+(1-x)水/甲醇/乙醇三个二元体系在常压下的气-液共存相的组成,并绘制了t-n和t-x相图。发现:三个二元体系的气相中N-甲基咪唑含量很少,在x≤0.90时,气相中x_(g)最大值不超过x_(g)=0.06,且乙醇体系的气相中含有的N-甲基咪唑最少,表明乙醇与N-甲基咪唑的相互作用相对于水和甲醇来说,最弱;且三个二元体系在常压下都不存在恒沸点。

In order to study the phase behavior of the binary mixtures of N-methylimidazole with water,methanol and ethanol,the equilibrium compositions of the gas-liquid phases of the mixtures of xN-methylimidazole+(1-x)water/methanol/ethanol were measured by measuring the refractive index of the gas and liquid phases.The t-n and t-x phase diagrams of the gas-liquid coexisting phase at atmospheric pressure were plotted and obtained.It was found that the content of N-methylimidazole in the gas phases of the three binary systems were all very small.The maximum value of x_(g)in the gas phase did not exceed x_(g)=0.06 at x≤0.90,and the N-methylimidazole contained in the gas phase of the mixture containing ethanol was the least,indicating that the interaction of ethanol with N-methylimidazole is the weakest relative to water and methanol.The three binary systems all have no azeotropic points at the atmospheric pressure.