Liquid-liquid equilibria of systems containing C1-C4 alcohols (methanol, ethanol, n-propyl alcohol, or tert-butyl alcohol), glycerol and olive oil

Larissa Madureira Pacholak do Espírito  Santo; Ana Maura  Novak; Maria Clara Corrêa Gomes  Palma; Giulia  Herbst; Luís Ricardo Shigueyuki  Kanda; Fernando Augusto Pedersen  Voll

doi:10.4025/actascitechnol.v48i1.74270

Authors

Larissa Madureira Pacholak do Espírito Santo Universidade Federal do Paraná
Ana Maura Novak Universidade Federal do Paraná
Maria Clara Corrêa Gomes Palma Universidade Federal do Paraná
Giulia Herbst Universidade Federal do Paraná
Luís Ricardo Shigueyuki Kanda Universidade Federal do Paraná
Fernando Augusto Pedersen Voll Universidade Federal do Paraná

DOI:

https://doi.org/10.4025/actascitechnol.v48i1.74270

Keywords:

Olive oil; Glycerol; Alcohols; Liquid-liquid Equilibrium.

Abstract

This work reports experimental results and thermodynamic modeling of liquid-liquid equilibrium of systems containing alcohols with 1 to 4 carbons, glycerol, and olive oil. Experiments were conducted at 35ºC and atmospheric pressure. UNIQUAC model was used to calculate the phase equilibria and fitted well the experimental data with root mean square deviations below 1 wt.% for all studied systems. Additionally, consistency was observed between the calculated and experimental binodal curves. The results obtained here showed that the miscibility region of ternary systems increases with the increased number of carbons in the alcohol. By studying the behavior of ternary systems, glycerolysis reactions in the presence of solvents, aiming to produce diacylglycerol-rich oils, could be designed to work in the single-phase region, enhancing product yields. However, side reactions could lead to the production of fatty acid alkyl esters, due to the presence of alcohols. Aspen Plus® v. 12.1 was used to assess whether the formation of diacylglycerols (DAG) or esters was thermodynamically favorable, indicating the possibility of using t-butanol as a solvent to enhance DAG yield.

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