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Sustainable biocatalytic biodiesel production : A thermodynamic analysis

Abstract

In the present thesis it was aimed at achieving thermodynamic analysis of reactions involved in enzymatic biodiesel production with specific focus on chemical and phase equilibria of reactive systems. Lipase-catalyzed biodiesel production (biocatalytic ethanolysis) presents significant advantages: Easy recovery of glycerol, no complex down-processing operations for elimination of catalyst and salt, and requires less organic solvent and lower energy consumption compared with conventional chemical methods. In overall, the major aims of this thesis were evaluating and subsequently finding feasible solutions to the questions emerged during the corresponding studies that have been performed worldwide. Some of the questions that were answered as appropriate as possible can be listed as follows: 1) What is the solubility of EtOH in vegetable oils and in FAEE blends and how does it change with temperature? 2) Is it possible to prevent denaturing impact of EtOH on biocatalysts? 3) What are the feedstock content (water and FFA) impacts on glycerol and EtOH miscibility with ester species? 4) Is it necessary removing glycerol by-product simultaneously? 5) Is it feasible providing monophasic or homogeneous reaction media that procure lower external mass transfer resistance? 6) What are the moisture absorption limits of FAAE species? 7) How are the interactions  More>>
Authors:
Publication Date:
Sep 15, 2012
Product Type:
Technical Report
Report Number:
NEI-DK-5820
Resource Relation:
Other Information: TH: Thesis (Ph.D.); HTF-2008; 430 refs., 163 figs., 60 tabs.
Subject:
09 BIOMASS FUELS; BIOFUELS; DIESEL FUELS; THERMODYNAMIC ACTIVITY; ENZYMES; LIPASES; BIOETHANOL
OSTI ID:
22016515
Research Organizations:
Aarhus Univ.. Dept. of Engineering, Aarhus (Denmark)
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
TRN: DK1301008
Availability:
Available at http://pure.au.dk/portal/files/50825484/Phd_Thesis_GG.pdf
Submitting Site:
DK
Size:
397 page(s)
Announcement Date:
Jan 10, 2013

Citation Formats

Guezel, G. Sustainable biocatalytic biodiesel production : A thermodynamic analysis. Denmark: N. p., 2012. Web.
Guezel, G. Sustainable biocatalytic biodiesel production : A thermodynamic analysis. Denmark.
Guezel, G. 2012. "Sustainable biocatalytic biodiesel production : A thermodynamic analysis." Denmark.
@misc{etde_22016515,
title = {Sustainable biocatalytic biodiesel production : A thermodynamic analysis}
author = {Guezel, G}
abstractNote = {In the present thesis it was aimed at achieving thermodynamic analysis of reactions involved in enzymatic biodiesel production with specific focus on chemical and phase equilibria of reactive systems. Lipase-catalyzed biodiesel production (biocatalytic ethanolysis) presents significant advantages: Easy recovery of glycerol, no complex down-processing operations for elimination of catalyst and salt, and requires less organic solvent and lower energy consumption compared with conventional chemical methods. In overall, the major aims of this thesis were evaluating and subsequently finding feasible solutions to the questions emerged during the corresponding studies that have been performed worldwide. Some of the questions that were answered as appropriate as possible can be listed as follows: 1) What is the solubility of EtOH in vegetable oils and in FAEE blends and how does it change with temperature? 2) Is it possible to prevent denaturing impact of EtOH on biocatalysts? 3) What are the feedstock content (water and FFA) impacts on glycerol and EtOH miscibility with ester species? 4) Is it necessary removing glycerol by-product simultaneously? 5) Is it feasible providing monophasic or homogeneous reaction media that procure lower external mass transfer resistance? 6) What are the moisture absorption limits of FAAE species? 7) How are the interactions of reactive species in terms of miscibility/immiscibility phenomena? 8) Is it thermodynamically feasible providing monophasic reaction media? 9) How can LLE and VLE phase behaviors help to determine optimum reaction conditions? 10) How can the results of LLE and VLE studies be used so as to determine appropriate refining operations? (LN)}
place = {Denmark}
year = {2012}
month = {Sep}
}