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Measurement of antioxidant effects on the auto-oxidation kinetics of methyl oleate-methyl laurate blend as a surrogate biodiesel system
Samadhi T.W.a, Hirotsu T.b, Goto S.b
a Chemical Engineering Program, Faculty of Industrial Technology, Bandung Institute of Technology, Bandung, 40132, Indonesia
b Research Center for New Fuels and Vehicle Technology, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba East, Tsukuba, Ibaraki, 8564, Japan
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Copyright © 2017 BCREC GROUP. All rights reserved.This research investigates the feasibility of methyl oleate-methyl laurate blend as a surrogate biodiesel system which represents jatropha-coconut oil biodiesel, a potentially suitable formulation for tropical climate, to quantify the efficacy of antioxidant additives in terms of their kinetic parameters. This blend was tested by the Rancimat EN14112 standard method. The Rancimat tests results were used to determine the primary oxidation induction period (OIP) and first-order rate constants and activation energies. Addition of BHT and Ecotive™ antioxidants reduces the rate constants (k, h-1) between 15 to 90% in the 50-200 ppm dose range, with Ecotive™ producing significantly lower k values. Higher dose reduces the rate constant, while oleate/laurate ratio produces no significant impact. Antioxidants in-crease the oxidation activation energy (Ea, kJ/mol) by 180 to almost 400% relative to the non-antioxidant value of 27.0 kJ/mol. Ecotive™ exhibits lower Ea, implying that its higher efficacy stems from a better steric hindrance as apparent from its higher pre-exponential factors. The ability to quan-tify oxidation kinetic parameters is indicative of the usefulness of methyl oleate-laurate pure FAME blend as a biodiesel surrogate offering better measurement accuracy due to the absence of pre-existing antioxidants in the test samples.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Antioxidant additives,First-order rate constants,Measurement accuracy,Oxidation activation energy,Oxidation induction periods,Oxidation kinetics,Preexponential factor,Rancimat[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Antioxidant,Biodiesel,Oxidation kinetics,Rancimat[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]This research was funded and conducted through the 2010 Asia Biomass Researcher In-vitation program organized by the New Energy Forum, Japan. Laboratory work for this re-search was entirely undertaken at the Re-search Center for New Fuels and Vehicle Tech-nology, National Institute of Advanced Indus-trial Science and Technology (AIST), Tsukuba East, Japan.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.9767/bcrec.12.2.861.157-166[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]