resumo
Liquid-liquid equilibrium (LLE) and vapor-liquid equilibrium (VLE) data of binary and ternary systems formed at the biodiesel production and purification industrial units were used to evaluate the performance of commonly used excess Gibbs energy (g(E)) models, cubic equations of state (EoS), equations of state with EoS-g(E) mixing rules, and association equation of state models. The models used in this study are the UNIFAC, Soave-Redlich-Kwong (SRK) EoS, the SRK-MHV2, the Peng-Robinson (PR) EoS using the MHV2 mixing rule, the Predictive Soave-Redlich-Kwong (PSRK) EoS, and the Cubic-Plus-Association (CPA) EoS. All models were used with previously established parameters, and the applicability of each model to the various systems investigated and the quality of the description of the phase equilibria are discussed. The results obtained show that the CPA EoS is the most adequate model to be used for the description of the phase equilibria of importance for the design and optimization of biodiesel production plants.
palavras-chave
EQUATION-OF-STATE; VAPOR-LIQUID-EQUILIBRIA; PLUS ALCOHOL SYSTEMS; MIXING RULES; CPA EOS; MULTICOMPONENT SYSTEMS; MUTUAL SOLUBILITIES; TERNARY-SYSTEMS; METHYL OLEATE; ENERGY MODELS
categoria
Engineering
autores
Oliveira, MB; Ribeiro, V; Queimada, AJ; Coutinho, JAP
nossos autores
Mariana Belo Oliveira
Bolseiro de pós-Doutoramentoagradecimentos
Financial support was provided to LSRE by FEDER/POCI/2010. M.B.O. acknowledges Fundacao para a Ciencia e a Tecnologia through her Ph.D. (SFRH/BD/29062/2006) scholarship. A.J.Q acknowledges support from POCI/N010/2006. We would like to thank Prof. Avelino da Silva from the University of Aveiro for his valuable contribution in assisting model calculations. The program used to perform the calculations with the CPA EoS is available at http://path.web.ua.pt/biodiesel.asp.