Ester content evaluation in biodiesel from animal fats and lauric oils 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
European Journal of Lipid Science and Technology
年/卷/期
2006 / 108 / 4
页码
309-314
ISSN号
1438-7697
作者单位
Institute of Chemistry,Karl-Franzens-University Graz,Graz,Austria;Institute of Chemistry,Karl-Franzens-University Graz,Graz,Austria;Institute of Chemistry,Karl-Franzens-University Graz,Graz,Austria;
作者
Sigurd Schober;Ingrid Seidl;Martin Mittelbach;
摘要
A modified method for the determination of ester contents of biodiesel based on EN 14103 has been developed.The method includes natural contents of heptadeca-noic acid ester,which are found in animal fats and interfere with the standard method,into the calculation of ester content values.As a result,biodiesel samples prepared from waste animal fats and oils showed an increase in ester content between 2 and 7wt-% compared to values measured according to EN 14103.Furthermore,modifications of the GC temperature program made it possible to include also short-chain fatty acid esters C_8-C_(12),which can be found in coconut and palm kernel oil,into the calculation.Measurements showed that the ester content of such biodiesel differs by more than 40 wt-% compared to EN 14103 determinations.However,also the stability of the internal standard solution methyl heptadecanoate influences the values of ester content.It can be demonstrated that after a period of 7 days,an ester content decrease of about 2 wt-% can be observed.Therefore,the use of almost freshly prepared standard solutions should be recommended.
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关键词/主题词
Biodiesel;ester content;gas chromatography;heptadecanoic acid.;
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