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Abstract
Biodiesel is a renewable fuel mainly produced by methylation of triglycerides of vegetable oils or animal fats. The production processes nowadays are particularly based on the utilization of inorganic alkali catalysts. However, it has been proved that an organic alkali – tetramethylammonium hydroxide (TMAH) – can also be used as a very efficient transesterification catalyst. The work presented herein is focused on mathematical modeling of the kinetics of TMAH-catalyzed transesterification of triglycerides at different reaction conditions, specifically at varying reaction temperature with the aim to understand the reaction mechanism and identify the key variables for optimization of the production process. The main kinetic parameters were calculated based on the mathematical- statistical processing of experimental kinetic data. The reaction rate constants for individual consecutive and reversible reactions and the corresponding activation energies were calculated.
Highlights
Biodiesel is a biofuel derived from vegetable oils or animal fats
Transesterification is a reversible reaction in which the triglycerides react with short-chain alcohol under alkali or acid conditions to form fatty acid methyl esters (FAME), and the main by-product, glycerol [7-9]
This work aimed to study the kinetics of triglycerides methanolysis catalyzed with tetramethylammonium hydroxide of a constant concentration at specific reaction temperatures
Summary
Biodiesel is a biofuel derived from vegetable oils or animal fats. It is predominantly composed of a mixture of monoalkyl esters of saturated and unsaturated long-chain fatty acids. Because of its chemical composition, it is considered as a renewable, non-toxic, biodegradable, oxygenated and sulfur-free and readily available fuel [1,2,3,4,5,6]. The most common way of biodiesel production is transesterification. Transesterification is a reversible reaction in which the triglycerides react with short-chain alcohol (e.g. methanol → methanolysis) under alkali or acid conditions to form fatty acid methyl esters (FAME), and the main by-product, glycerol [7-9].
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