Oxidation Stability of Biodiesel Produced from Non-Edible Oils of African Origin Tshwane Univ. of Technology

Format:

Conference/Event

Author/Creator:

Kivevele, Kivevele, author.

Contributor:

Agarwal, Avinash Kumar

Gupta, Tarun

Mbarawa, Makame

Conference Name:

SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

Mono alkyl esters of long-chain fatty acids derived fromrenewable lipid feedstock, such as vegetable oils or animal fats,also known as biodiesel are well positioned to replace mineraldiesel. The outstanding technical problem with biodiesel is that itis more susceptible to oxidation owing to its exposure to oxygenpresent in the air and high temperature. This happens mainly due tothe presence of varying numbers of double bonds in the free fattyacid molecules. The chemical reactivity of esters can therefore bedivided into oxidative and thermal instability, which can bedetermined by the amount and configuration of the olefinicunsaturation in the fatty acid chains. Many of the plant-derivedfatty oils contain polyunsaturated fatty acids that are more proneto oxidation.Increasing production of biodiesel from vegetable oils (edible)places strain on food production, availability and price and leadsto food versus fuel conflict. Hence, this study evaluates biodieselderived from low cost non-edible oils, primarily available inAfrican continent, namely croton megalocarpus, moringa oleifera andjatropha oils. The fuel related properties and oxidation stabilityof croton oil methyl ester (COME), moringa oil methyl ester (MOME)and jatropha oil methyl ester (JOME) were determined and comparedwith global biodiesel standards such as ASTM D6751 and EN 14214.Oxidation stability of COME, MOME and JOME with and withoutantioxidants was analyzed using Rancimat method. The results showedthat most of the properties of COME, MOME and JOME fulfilled theminimum requirements specified in the ASTM D6751 and EN 14214biodiesel standards. However, COME and MOME did not fulfill theoxidation stability requirements specified in EN 14214 (6 h), whileJOME displayed a remarkably high oxidation stability of 10.43 h.Also, this study examined the effectiveness of three antioxidantsnamely 1, 2, 3 trihydroxy benzene (PY), 3, 4, 5-tri hydroxy benzoicacid (PG) and 2-tert butyl-4-methoxy phenol (BHA) on COME, MOME andJOME. The result showed that, the effectiveness of theseantioxidants was in the order of PYPGBHA

Notes:

Vendor supplied data

Publisher Number:

2011-01-1202

Access Restriction:

Restricted for use by site license