Author : Suriya Phankosol, Kaokanya Sudaprasert, Supathra Lilitchan, Kornkanok Aryusuk and Kanit Krisnangkura
Journal : Journal of the American Oil Chemists’ Society, 2015, Volume 92, Issue 7, pp 1051–1061.
More Information : https://doi.org/10.1007/s11746-015-2667-7
Abstract
Kinematic viscosity (µ) is an important physical property of fatty acid methyl esters (FAME) and biodiesel. In this work, the Martin’s rule of free energy additivity is extended to cover the kinematic viscosity of saturated and unsaturated FAME commonly found in nature. The proposed model can also be extended to estimate kinematic viscosity of biodiesel. The kinematic viscosity of a FAME or a biodiesel can be easily estimated from its carbon number (z), number of double bonds (nd) at different temperatures (T) without a prior knowledge of the viscosity of individual FAME. Both zave and nd(ave) can be derived from its fatty acid composition. Thus, kinematic viscosity of biodiesel at temperatures between 20 and 100 °C and at atmospheric pressure can be estimated. The average absolute deviation (AAD) estimated at 20–100 °C for saturated, unsaturated FAME, biodiesels and biodiesel blends are 4.15, 3.25, 6.95 and 2.79 %, respectively. The biodiesels collected in this study (191 data points) have the z ave and nd(ave) between 14.10 and 17.96 and 0.21–1.54, respectively. The standard deviation was 0.249. The proposed model would be good for estimation of viscosity of biodiesel containing normal fatty acids, generally found in biodiesel feed stocks.
Keywords
Biodiesel, Fatty acid composition, Fatty acid methyl esters, Viscosity