Thermodynamics of liquid mixtures containing a very strongly polar compound: Part 6. DISQUAC characterization of N,N-dialkylamides |
| |
| Institution: | 1. Department of Process and Products Development, School of Chemical Engineering, University of Campinas – UNICAMP, 500 Albert Einstein Avenue, 13083-852, Campinas, SP, Brazil;2. Department of Applied Physics, Institute of Physics Gleb Wataghin (IFGW), University of Campinas– UNICAMP, 500 Albert Einstein Avenue, 13083-852, Campinas, SP, Brazil;3. Department of Food Engineering, School of Food Engineering, University of Campinas – UNICAMP, 500 Albert Einstein Avenue, 13083-852, Campinas, SP, Brazil;1. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada (IPQA), Universidad Nacional de Córdoba (UNC) - CONICET, Córdoba, Argentina;2. Planta Piloto de Ingeniería Química (PLAPIQUI), Universidad Nacional del Sur (UNS)- CONICET, Bahía Blanca, Buenos Aires, Argentina;3. Departamento de Ingeniería Química, Universidad Nacional del Sur (UNS), Argentina;1. Instituto Nacional de Ciência e Tecnologia de Energia e Ambiente, Universidade Federal da Bahia (UFBA), Av. Barão de Jeremoabo 147, 40170-115 Salvador, BA, Brazil;2. Instituto de Quimica, UFBA, Brazil;3. Instituto de Fisica, UFBA, Brazil;4. Centro Interdisciplinar de Energia e Ambiente, UFBA, Brazil;1. Institute of Chemistry, University of Campinas (UNICAMP), P.O.Box 6154, 13083-970 Campinas, SP, Brazil;2. Food Engineering Faculty, University of Campinas (UNICAMP), 13083-862 Campinas, SP, Brazil |
| |
| Abstract: | Systems of N,N di(n-alkylamides) (hereafter, N,N-dialkylamides) with alkane, benzene, toluene, 1-alkanol or 1-alkyne have been investigated in the framework of the DISQUAC model. The corresponding interaction parameters are reported. They change regularly with the molecular structure of the mixture components. This variation is similar to those encountered when treating other systems in terms of DISQUAC. The model describes consistently a whole set of thermodynamic properties: liquid–liquid equilibria (LLE), vapor–liquid equilibria (VLE), solid–liquid equilibria (SLE), molar excess Gibbs energies (GE), molar excess enthalpies (HE), molar excess heat capacities at constant pressure (CPE), partial molar excess properties at infinite dilution, enthalpies and heat capacities. The model also provides good results for the Kirkwood–Buff integrals and for the linear coefficients of preferential solvation. For ternary systems, DISQUAC predictions on VLE and HE, obtained using binary parameters only, are in good agreement with the experimental data. A short comparison between DISQUAC and Dortmund UNIFAC results is shown. DISQUAC improves UNIFAC results on HE and CPE, magnitudes which strongly depend on the molecular structure. The investigated mixtures behave similarly to those characterized by thermodynamic properties which arise from dipolar interactions. Association/solvation effects do not play, as a whole, an important role in the studied systems. This may explain that the ERAS model fails when representing the thermodynamic properties of dimethylformamide + 1-alkanol mixtures. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
