High-pressure phase equilibria of systems carbon dioxide + n-eicosane and propane + n-eicosane |
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| Affiliation: | 1. Planta Piloto de Ingeniería Química - Universidad Nacional del Sur - CONICET - CC 717 - 8000 Bahía Blanca, Argentina;2. Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016GCA Córdoba, Argentina;3. Laboratório de Temodinâmica Aplicada – URI-Campus de Erechim, Av. Sete de Setembro 1621, Erechim, RS, Brazil;1. Grupo de Pesquisa em Termofluidodinâmica Aplicada, Chemical Engineering Department, Universidade Federal do Ceará, Fortaleza, CE, Brazil;2. CENPES – Centro de Pesquisa e Desenvolvimento Leopoldo Américo de Mello, Cidade Universitária, Rio de Janeiro, RJ, Brazil;1. Engenharia de Processos Químicos e Bioquímicos/Escola de Química, Universidade Federal do Rio de Janeiro, Cidade Universitária, Rio de Janeiro, RJ, Brazil;2. Programa de Engenharia Química/COPPE, Universidade Federal do Rio de Janeiro, Cidade Universitária, Rio de Janeiro, RJ, Brazil |
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| Abstract: | In this work we investigated the phase equilibrium behavior of the binary asymmetric systems propane (C3) + n-eicosane (C20) and carbon dioxide (CO2) + n-eicosane (C20). We used a variable-volume view cell for obtaining fluid–fluid equilibrium (FFE), solid–fluid equilibrium (SFE) and solid–fluid–fluid equilibrium (SFFE) experimental data. We modeled the phase equilibria of both systems using the Peng–Robinson Equation of State for describing the fluid phases and an expression for the fugacity of pure solid n-eicosane with parameters fit to reproduce the pure n-eicosane melting line. We performed the phase equilibrium calculations by implementing path-following methods for tracking entire solid–fluid (SF) and solid–fluid–fluid (SFF) equilibrium curves for binary asymmetric mixtures. This made it possible to obtain complete isoplethic lines or complete three-phase equilibrium lines in single runs. Although the model is relatively simple, it is able to grasp the complex observed behavior for the systems studied here. |
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