Physical properties of concern systems to the oil and biodiesel production industry: determination of experimental data, modeling and prediction

Author(s)

Priscila Missano Florido

• Document type: Doctoral Thesis
• Press: Pirassununga.
• Institution: Universidade de São Paulo (USP). Faculdade de Zootecnica e Engenharia de Alimentos (FZE/BT)
• Defense date: 2018-09-14

Examining board members

Cintia Bernardo Gonçalves; Rodrigo Corrêa Basso; Elias de Souza Monteiro Filho; Alessandra Lopes de Oliveira; Christianne Elisabete da Costa Rodrigues; Marlus Pinheiro Rolemberg

• Advisor: Cintia Bernardo Gonçalves

Abstract

The knowledge of physical properties of systems formed by fatty compounds and solvents has great relevance because these information are essential for the design of equipments and optimization of processes. It is not feasible to gather an experimental database thus, prediction models become of great potential and practical value. The objective of this Ph.D. thesis was to form an experimental database of physical properties of fatty compounds systems; data adjust to obtain new parameters of the UNIFAC-VISCO model, besides performing predictive tests with other models for comparison purposes;and indirect determination and correlation of excess molar volume and activity coefficient at infinite dilution. 218 systems were studied, resulting in 2404 density data, 2404 viscosity data, and 199 surface tension data. In addition, indirect data of excess molar volume and activity coefficient were obtained for systems formed by methyl esters and partial acylglycerol. The influence of temperature and composition were studied, and both density and viscosity are influenced by the mentioned parameters. The density estimation by mixing rules resulted in average relative deviation (ARD) lower than 1%, while prediction using the GC-VOL model resulted in an ARD range of 5% - 40%. For viscosity, the mixing rules resulted in deviations from 0.6% to 204%, and the UNIFAC-VISCO model presented ARD around 10% for data prediction. For surface tension, the parameters of a Wilson\'s Equation based model were adjusted, and the prediction of multicomponent systems resulted in deviations lower than 7%. An equation for estimate the residual composition was studied based on indirect data of excess molar volume and coefficient of activity at infinite dilution. (AU)

• FAPESP's process: 14/09757-0 - Physical properties of systems of interest to the oil industry and biodiesel production: determination of experimental data, modeling and prediction
• Grantee: Priscila Missano Florido
• Support Opportunities: Scholarships in Brazil - Doctorate