Liquid–liquid equilibrium data and thermodynamic modeling for systems related to the production of ethyl esters of fatty acids from soybean soapstock acid oil

Armazenamento, estabilidade oxidativa e caracterização do biodiesel metílico de soja

“…A análise dos resultados referentes a massa específica (Figura 4a) demonstrou que mesmo após 90 dias de armazenamento, as amostras apresentaram-se conformidade com a Resolução ANP n°45/ 2014 [37] (com valores entre 0,85 g/cm 3 e 0,90 g/cm 3 ). Verifica-se ainda, a elevação deste valor à medida que transcorre o tempo de armazenamento do biodiesel.…”

Analysis of multiphasic behavior during the ethyl esterification of fatty acids catalyzed by a fermented solid with lipolytic activity in a packed-bed bioreactor in a closed-loop batch system

“…The organic phase was considered as the reactant phase. In this work, the fatty acids from soybean soapstock (FA-SSAO) and ethyl esters of acids from soybean soapstock (EE-SSAO) were treated as pseudo-components, where the number of subgroups and average molar weight were as presented by Serres et al [26]. The vapor pressure and Gibbs free energy of formation used are the values of pure oleic acid and ethyl oleate [27], as representative compounds for FA-SSAO and EE-SSAO, respectively.…”

“…3C). This occurred because higher levels of ethanol increase the miscibility of the water in the organic phase [26]. Once formed, the aqueous phase contained low amounts of esters (<1.2 mol%) and fatty acids (<0.035 mol%).…”

Ethanol as a Subgroup of the UNIFAC Model in the Prediction of Liquid-Liquid Equilibrium in Food and Fuel Systems

“…Thermodynamic modeling can be used to predict or correlate the experimental behavior of fatty acid systems described through LLE data. The approach using excess Gibbs energy models is widely applied to describe biodiesel and vegetable oil systems through thermodynamic models, such as NRTL [18][19][20][21][22], UNIQUAC [18,[22][23][24], and UNIFAC [25][26][27][28]. Although thermodynamic models, such as UNIQUAC and NRTL, are capable of accurately representing the experimental data, both are restricted to the specificity of the type of vegetable oil used, as the phase equilibrium parameters are adjusted solely for the system described in the experimental data used for the LLE data fitting.…”