2005
DOI: 10.1590/s0103-90162005000300014 View full text |Buy / Rent full text
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Abstract: Biodiesel consists of long-chain fatty acid esters, derived from renewable sources such as vegetable oils, and its utilization is associated to the substitution of the diesel oil in engines. Depending on the raw material, biodiesel can contain more or less unsaturated fatty acids in its composition, which are susceptible to oxidation reactions accelerated by exposition to oxygen and high temperatures, being able to change into polymerized compounds. The objective of this work was to determine the oxidative sta… Show more

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“…16 Therefore, depending on the degree of removal of these compounds and especially the degree of unsaturation of the esters produced, the addition of synthetic antioxidants and/or the reintroduction of the natural antioxidants originally present in the starting material can be rather crucial for practical applications. 17 Mittelbatch and Schober 18 found that the efficiency of a given antioxidant depends on the raw material and the technology employed in producing the biodiesel, which underscores the importance of carrying out specific investigations for esters produced by different reaction pathways.…”
Section: Introductionmentioning
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“…16 Therefore, depending on the degree of removal of these compounds and especially the degree of unsaturation of the esters produced, the addition of synthetic antioxidants and/or the reintroduction of the natural antioxidants originally present in the starting material can be rather crucial for practical applications. 17 Mittelbatch and Schober 18 found that the efficiency of a given antioxidant depends on the raw material and the technology employed in producing the biodiesel, which underscores the importance of carrying out specific investigations for esters produced by different reaction pathways.…”
Section: Introductionmentioning
“…227 A karanja (Pongamia pinnata) por sua vez, contém flavonas, furanoflavonas, furanoflavonois, avenasterol, cromenoflavonas e furanodicetonas que tornam o seu óleo não comestível. 60 outros óleos contêm substâncias particulares que podem ser benéficas ao biodiesel como, por exemplo, a vitamina E no caso da soja 228 ou sesamol e lignanas como a sesamina e a sesamolina no caso do gergelim, 61,203 as quais jogam um papel importante na estabilidade oxidativa e na atividade antioxidante desses óleos. Pouca atenção tem sido dispensada à permanência no biodiesel dessas substâncias, sejam tóxicas ou não.…”
Section: O Crescimento Daunclassified
“…Basicamente o número representa a massa de iodo (em gramas) necessária para saturar os ácidos graxos não saturados. Como consequências da oxidação, pode ocorrer a formação de depósitos e a deterioração do óleo lubrificante, influenciando no desempenho do motor pela elevação da sua viscosidade e da acidez (Ferrari et al, 2005). Na hidrogenação, os catalisadores homogêneos mais utilizados são complexos dos metais de transição solúveis no óleo, enquanto na catálise heterogênea utilizam-se metais como Pd, Pt, Cu, Ag, Rh, Ir, Os e Ru suportados em sílica (Fernandez et al, 2007), alumina (Piqueras et al, 2006) e carbono (Hsu et al,.…”
Section: Introductionunclassified