Noncatalytic Esterification for Biodiesel Production.

Noncatalytic Esterification;Noncatalytic Biodiesel Production;Kinetics of Esterification;Mechanism of Esterification;Biodiesel from Algae;Chemical Engineering;Engineering;Chemical Engineering

Pinnarat, TanawanVioli, Angela ;

University of Michigan

关键词: Noncatalytic Esterification;    Noncatalytic Biodiesel Production;    Kinetics of Esterification;    Mechanism of Esterification;    Biodiesel from Algae;    Chemical Engineering;    Engineering;    Chemical Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/89765/tanawanp_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Noncatalytic esterfication of fatty acids is an alternative process for biodiesel production.This thesis showed the possibility of conducting the esterification of oleic acid under subcritical ethanol conditions with an acceptable yield.A yield of around 75% was obtained at 230 oC, 5.5 MPa with an hour of reaction.The molar ratio of ethanol to oleic acid was found to have an optimal point, which is 3:1 within the range studied of 1:1 to 10:1. Water was shown to inhibit the reaction.The stainless steel reactor walls do not have a significant catalytic effect on the reaction. This thesis also demonstrates the possibility of biodiesel production from micro-algae without drying and extraction by using the concept of a two-step noncatalytic process involving hydrolysis followed by esterification. This thesis also examined the esterification kinetics at both phenomenological and mechanistic levels.The phenomenological models (simple power-law kinetics and fatty acid catalyzed kinetics) provide a reasonable prediction of conversion with a small number of parameters. The simple power-law kinetics model with few parameters was able to fit experimental data from esterification. The model provides an acceptable conversion prediction within the parameter studied.The fatty acid catalyzed kinetics model used experimental data from both esterification and hydrolysis (reverse path of esterification) to estimate the values of its 6 parameters.This model gives a reasonable prediction for a wider range.The mechanistic model was developed to study how the reaction proceeds.The study showed that esterification is mainly catalyzed by protons, which came from the dissociation of oleic acid.