Experimental Data, Thermodynamic Modeling and Sensitivity Analyses for the Purification Steps of Ethyl Biodiesel From Fodder Radish Oil Production

Abstract

-The goals of this work were to present original liquid-liquid equilibrium data of the system containing glycerol + ethanol + ethyl biodiesel from fodder radish oil, including the individual distribution of each ethyl ester; to adjust binary parameters of the NRTL; to compare NRTL and UNIFAC-Dortmund in the LLE representation of the system containing glycerol; to simulate different mixer/settler flowsheets for biodiesel purification, evaluating the ratio water/biodiesel used. In thermodynamic modeling, the deviations between experimental data and calculated values were 0.97% and 3.6%, respectively, using NRTL and UNIFAC-Dortmund. After transesterification, with 3 moles of excess ethanol, removal of this component until a content equal to 0.08 before an ideal settling step allows a glycerol content lower than 0.02% in the ester-rich phase. Removal of ethanol, glycerol and water from biodiesel can be performed with countercurrent mixer/settler, using 0.27% of water in relation to the ester amount in the feed stream.

Liquid–Liquid Equilibria of Glycerol + Alcohol + Safflower Biodiesel Systems: Measurement and Modeling

“…Since it is a mixture of esters and not a pure molecule, biodiesel was considered as a single pseudo-component, and its composition in terms of FAMEs and FAEEs was obtained by gas chromatography. Finally, the biodiesel values of r i and q i were calculated from a linear mass fraction mixing rule of the molecular species, as reported in the literature. ,,, This pseudo-component approach of systems containing biodiesel, recommended by Basso et al (2012) and applied in other works, , allows a simplified and realistic description of multicomponent mixtures with the aid of chemical analysis and the group contribution method. UNIQUAC structural parameters for methanol, ethanol, and glycerol were retrieved from a conventional procedure based on chemical bond distances .…”

Synthesis and characterization of monoacylglycerols through glycerolysis of ethyl esters derived from linseed oil by green processes

“…14 The employment of ethanol instead of methanol offers a number of benets, include higher miscibility with vegetable oils that allows better contact in the reaction step. 32 Besides, as reduce environmental impacts avoiding the emission of greenhouse gases and using a renewable product obtained by biotechnological processes, the ethanol still is a non-toxic compound and safe to human health, 33 and it is produced in large quantities from sugar cane in Brazil. 36 Schulz et al, 8 reported the synthesis of MAGs from glycerolysis of the fatty acid methyl esters with glycerol.…”