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本文采用两步法合成1-己基-3-甲基咪唑硝酸盐离子液体([Hmim]NO_3),经FT-IR、NMR表征后应用该离子液体萃取脱除模拟汽油中的噻吩。常压、40℃条件下自由度f=1,采用浊点-密度法测定饱和三元体系[Hmim]NO_3(x_1)﹣噻吩(x_2)﹣正庚烷(x_3)平衡溶解度关系。并经非线性经验公式拟合得:上、下相溶解度关联曲线、密度关联曲线。考察萃取过程影响因素,结果表明:实验最佳摩尔剂油比为1:3,1 h萃取达平衡,脱硫率为39.78 53%;对比不同温度条件下脱硫率D_(40℃)>D_(30℃)≈D_(50℃)>D_(20℃)>D_(10℃),实验最适的萃取温度为40℃。依据平衡溶解度关系计算得选择性系数S为288.8576,分配系数β为1.0976。由选择性系数较大,且分配系数大于1可证明应用[Hmim]NO_3萃取脱除噻吩是可行的,且[Hmim]NO_3对噻吩有较强的萃取能力。
In this paper, 1-hexyl-3-methylimidazolium nitrate ionic liquid ([Hmim] NO_3) was synthesized by a two-step method and was characterized by FT-IR and NMR. Atmospheric pressure and degree of freedom under the conditions of 40 ℃ f = 1, the equilibrium solubility of saturated ternary system [Hmim] NO_3 (x_1) - thiophene (x_2) - n - heptane (x_3) was determined by cloud point - density method. And the nonlinear empirical formula obtained by fitting: upper and lower phase solubility correlation curve, density curve. The results showed that the optimal molar ratio of oil to solvent was 1: 3, the extraction equilibrium was reached at 1 h and the desulfurization rate was 39.78%. The results showed that when the desulfurization rate was higher than D_ (30 ℃)> D_ (30) under different temperature conditions, ℃) ≈ D_ (50 ℃)> D_ (20 ℃)> D_ (10 ℃). The optimal extraction temperature was 40 ℃. Based on the equilibrium solubility relationship, the selectivity coefficient S was 288.8576 and the partition coefficient β was 1.0976. It is proved that the extraction of thiophene by [Hmim] NO_3 is feasible and the [Hmim] NO_3 has a strong ability to extract thiophene by the larger selectivity coefficient and the distribution coefficient greater than 1.