Transesterification Mechanism
Download Transesterification Mechanism PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Transesterification Mechanism book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages.
Transesterification
Transesterification is an organic reaction in which the organic group R of an ester is exchanged with another organic group R of an alcohol according to a mechanism called alcoholysis. In this compilation, the authors address the way the transesterification process has become widely popular in biodiesel production, on an industrial scale, by reaction of triglyceride with short-length alcohol (methanol and/or ethanol).Next, Jatropha curcas Linnaeus, a non-edible raw material, is discussed as an attractive alternative for biodiesel production. The heterogeneous acid catalysis of this second-generation raw material is examined, including the mechanisms of esterification of fatty acids and transesterification of the triacylglycerides present in Jatropha curcas L. oil.In biodiesel generation, the transesterification reaction is the main process used for vegetable oils, animal fats, waste cooking oil or micro/macroalgae. Thus, the authors propose that catalysts such as acid and base or enzymes should be used to improve the rate of production.The closing portion of this collection reviews the use of transesterification reactions within laboratory courses of environmental and sustainable chemistry programmes for undergraduate chemistry students over the past 15 years. The authors propose that in the future, these experiments should be revised to include discussions of process sustainability and illustrations of life-cycle analysis approaches to bio-fuel production.
Biodiesel
Author: Ayhan Demirbas
language: en
Publisher: Springer Science & Business Media
Release Date: 2007-12-20
Environmental and political concerns are generating a growing interest in alternative engine fuels such as biodiesel. Biodiesel is a renewable energy source produced from natural oils and fats, which can be used as a substitute for petroleum diesel without the need for diesel engine modification. In addition to being biodegradable and non-toxic, biodiesel is also essentially free of sulfur and aromatics, producing lower exhaust emissions than conventional gasoline whilst providing similar properties in terms of fuel efficiency. The greatest drawback of using pure vegetable oils as fuels are their high viscosity, although this can be reduced by techniques such as dilution, micro-emulsification, pyrolysis or transesterification. Of these processes, the transesterification of vegetable oil triglycerides in supercritical methanol has been shown to be particularly promising, producing high yields of low-viscosity methyl esters without the need of a catalyst. Furthermore,these methyl esters have a considerably lower flash point than that of pure vegetable oils. Biodiesel: A Realistic Fuel Alternative for Diesel Engines describes the production and characterisation of biodiesel, along with current experimental research work in the field. The book will be of great interest to advanced undergraduates, postgraduates and researchers in renewable energy, as well as to fuel engineers.
Reaction Pathways and Mechanisms in Thermocatalytic Biomass Conversion I
Volume I mainly focuses on the current understanding of the reaction pathways and mechanisms involved in several important catalytic conversions of cellulose and carbohydrates. It starts with nanoscale illustrations of biomass structures and describes various reactions including cellulose depolymerization to sugars, catalytic aldose-ketose isomerization and dehydration, selective oxidation, hydrogenolysis of cellulose and sugars, and the conversion of short carbohydrates. The specificity and function of different catalysts and reaction media in relation to the catalytic performances for these reactions are discussed with significant mechanistic details. Marcel Schlaf, PhD, is a Professor at the Department of Chemistry, University of Guelph, Canada. Z. Conrad Zhang, PhD, is a Professor at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China.