Optical property of biodiesel and its base stock in terahertz region

Abstract

Biodiesel is the product of catalysed transesterification reaction, in which fatty acid is transformed to fatty acid methyl ester (FAME), named biodiesel. The frequency-dependent absorption and refractive characters of biodiesels and its base stocks have been researched in the spectral range of 0.2-1.5 THz by terahertz time-domain spectroscopy (THz-TDS). The biodiesels showed higher absorption value than those of its base stocks because of the concomitant, and the increasing of absorption coefficients of three biodiesels differed with the different transesterification technology. The results suggested that THz-TDS can be a promising method to the quality control and ester transfer efficiency analysis of biodiesel.

Keywords

terahertz time-domain spectroscopy (THz-TDS) / biodiesel(BD) / fatty acid methyl ester (FAME)

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Acknowledgements

This work was supported by the Program for New Century Excellent Talents in University (No. NCET-08-0841), the Research Fund for the Doctoral Program of Higher Education (No. 200804250006), and the Foresight Fund Program from China University of Petroleum.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg