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    三聚甲醛-甲醛-水-BMIMNO3的气液相平衡研究

    Vapor-Liquid Equilibrium of Trioxane-Formaldehyde-Water-BMIMNO3 System

      摘要
    • 摘要: 研究了离子液体1-丁基-3-甲基咪唑-硝酸盐（BMIMNO3）对甲醛-水（FA-H2O）、三聚甲醛-水（TOX-H2O）体系的气液相平衡的影响。结果表明，BMIMNO3的加入可以有效改善体系的气液相平衡，加入摩尔分数为0.070的BMIMNO3可以使共沸现象消失。将非随机双液(NRTL)模型用于关联实验数据，TOX-H2O-BMIMNO3三元物系计算值与实验值的平均相对偏差为1.32%，FA-H2O-BMIMNO3三元物系计算值与实验值的平均相对偏差为1.74%。测定了TOX-FA-H2O-BMIMNO3的气液平衡数据，结果表明，BMIMNO3的加入可以使平衡时气相中的TOX摩尔分数增加17.49%。研究结果对提高气相中TOX的摩尔分数具有理论指导意义。

       

      Abstract: The effects of ionic liquids BMIMNO3 on the vapor-liquid equilibria of formaldehyde-trioxane-water（FA-TOX-H2O） systems were studied. The results showed that adding BMIMNO3 could effectively improve the vapor-liquid equilibrium of the system, and adding a certain amount of BMIMNO3 could eliminate the azeotrope phenomenon. The non-random two-liquid (NRTL) model was used to fit the experimental data. The average relative deviation between experimental and calculated values of the TOX-H2O-BMIMNO3 ternary system was 1.32%, and that of the FA-H2O-BMIMNO3 ternary system was 1.74%. The vapor-liquid equilibrium of TOX-FA-H2O-BMIMNO3 was measured. The results showed that the addition of BMIMNO3 could increase the molar fraction of TOX in the vapor phase by 17.49%. The results are significant for increasing the molar fraction of TOX in vapor phase.

       

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