Understanding the Interactions between Triolein and Cosolvent Binary Mixtures Using Molecular Dynamics Simulations

Area of Science:

• Chemical Engineering
• Renewable Energy
• Computational Chemistry

Background:

• Biodiesel production relies on transesterification of triglycerides with methanol.
• Low methanol solubility in triglycerides limits reaction rates.
• Cosolvents are explored to enhance miscibility and accelerate biodiesel synthesis.

Purpose of the Study:

• To investigate the role of cosolvents in triglyceride (triolein) solvation using molecular dynamics simulations.
• To understand how different cosolvents interact with triolein at a molecular level.
• To identify effective cosolvents for improving biodiesel production efficiency.

Main Methods:

• Molecular dynamics simulations of six binary triolein/cosolvent mixtures at 298.15 K.
• Analysis of partial densities, radial distribution functions, and solvent clustering around triolein.
• Evaluation of triolein conformational changes in response to cosolvent presence.

Main Results:

• Binary mixtures initially showed limited mixing, but fully miscible systems achieved homogeneity.
• Cosolvents interacted with both polar and nonpolar parts of triolein, influencing solvation.
• Tetrahydrofuran demonstrated superior solubilization of triolein, followed by cyclopentyl methyl ether, diethyl ether, and hexane.
• Triolein adopted a propeller conformation with good solubilizing cosolvents and a trident conformation otherwise.
• 1,4-dioxane's solubility in triolein increased with temperature.

Conclusions:

• Cosolvent miscibility with triglycerides is key to enhancing biodiesel reaction rates.
• The ability of a cosolvent to interact with both polar and nonpolar regions of triglycerides dictates its effectiveness.
• Tetrahydrofuran is a promising cosolvent for efficient biodiesel production.