Vapor-liquid equilibria and excess molar enthalpies for N-methyl-2-pyrrolidone with chloroethanes and chloroethenes

被引:27
作者
Gnanakumari, P
Rao, MVP [1 ]
Prasad, DHL
Kumar, YVLR
机构
[1] Sri Venkateswara Univ, Dept Chem, Tirupati 517502, Andhra Pradesh, India
[2] Indian Inst Chem Technol, Div Chem Engn, Hyderabad 500007, Andhra Pradesh, India
关键词
D O I
10.1021/je020065c
中图分类号
O414.1 [热力学];
学科分类号
摘要
Precise temperature-composition (T-x) data and excess molar enthalpies (H-m(E)) of binary mixtures of N-methyl-2-pyrrolidone (NMP) with chloroethanes and ethenes were measured by using an ebulliometer and a solution calorimeter. The chloroethanes are 1,2-dichloroethane, 1,1,1-trichloroethane, and 1,1,2,2-tetrachloroethane. The chloroethenes are trichloroethene and tetrachloroethene. The T-x data were used to compute vapor-phase composition and activity coefficients with the Wilson model. The experimental (H-m(E)) values are negative for four binary systems over the entire range of composition. An inversion in sign from negative to positive for the system N-methyl-2-pyrrolidone + tetrachloroethene was observed.
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页码:535 / 540
页数:6
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