Abstract

The possibility of the formation of practically nonvolatile molecular complexes between the components of mixture and the separating agent of various compositions has been shown using the benzene–heptane–N-methylpyrrolidone system as an example. When modeling the vapor–liquid phase equilibrium, as a rule, the real structure of the solution is not taken into account, assuming the monomolecular structure of the substances contained in the solution. This significantly affects the real values ​​of coefficients of relative volatility, leading to the appearance of concentration inversion. The values ​​of fractions of substances in a monomolecular form are experimentally determined.

中文翻译：

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分离剂在萃取蒸馏中的作用

摘要

以苯-庚烷-N-甲基吡咯烷酮体系为例，表明了混合物成分和各种成分的分离剂之间形成几乎不挥发的分子复合物的可能性。通常，在对汽液相平衡进行建模时，假定溶液中所含物质的单分子结构，则不会考虑溶液的真实结构。这极大地影响了相对挥发性系数的实际值，从而导致浓度倒置的出现。单分子形式的物质的分数的值是通过实验确定的。