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- W2062094562 abstract "Abstract An ebulliometer was used to measure total vapor-pressure (PTx) data on nine mixtures of water+N-methylethylenediamine (and the pure components) between 52 and 116°C. Bubble-point data were measured at six pressures from 13.33 to 101.325 kPa. These PTx data indicate the following azeotropic behavior: at pressures below 32.7 kPa there is a single maximum-boiling azeotrope, above 46.7 kPa there is no azeotrope, and between 32.7 and 46.7 kPa there is the possibility of a double azeotrope. This type of double azeotrope is rare because the pure component vapor pressures are considerably different (Psat1/Psat1≈1.6); it may be that the apparent extrema in the Tx data are due to artifacts related to the purity of the N-methylethylenediamine (≈95 mass%). A Redlich–Kister GE model was fitted to isotherms at 60, 85, 90 and 100°C via Barker’s method with an average standard error of 0.52% in pressure. The system exhibits large negative deviations from ideality (derived γ∞=0.05–0.67) which decrease with increasing temperature. Equimolar GE/T values thus derived increase with increasing temperature which predicts a negative HE. Equimolar CPE data, measured by differential scanning calorimetry (DSC), are positive and also increase with increasing temperature. These mixture thermodynamic data show that the system water+N-methylethylenediamine belongs to the class of mixtures where GE" @default.
- W2062094562 created "2016-06-24" @default.
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- W2062094562 date "2001-07-01" @default.
- W2062094562 modified "2023-10-14" @default.
- W2062094562 title "Thermodynamics of hydrogen-bonding mixtures 4: GE, HE, SE and CPE and possible double azeotropy of water+N-methylethylenediamine" @default.
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- W2062094562 doi "https://doi.org/10.1016/s0378-3812(01)00471-x" @default.
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