Volatility of Biodiesel Obtainted from Rapeseed Blends with Petroleum Diesel
The volatility has been studied since it influences the ignition quality of the fuels in a compression ignition engine. The chemical composition of -10# petrodiesel (-10PD) and rapeseed biodiesel (RME) was analyzed by gas chromatography-mass spectrometry (GC-MS). Volatility of -10PD and RME was studied by thermogravimetry (TG) and liquid volatile theory. Volatile index V was put forward for describing -10PD/RME volatility. A good correlation model was proposed for calculate the -10PD/RME volatility by RME blending ratio. The study showed that -10PD was mainly composed of alkanes: C8-C26. RME was mainly composed of saturated fatty acid methyl esters (SFAME): C14:0-C24:0, unsaturated fatty acid methyl esters (UFAME): C16:1-C22:1, C18:2 and C18:3. The mass fraction of SFAME and UFAME was 14.69% and 83.40%, respectively. RME is considerably more volatile in comparison to -10PD. The -10PD/RME volatility has relation to RME blending ratio. The volatility of B0-B20 is very close to -10PD. The volatility of B20-B100 is better with increasing the RME blending ratio.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
X. Chen et al., "Volatility of Biodiesel Obtainted from Rapeseed Blends with Petroleum Diesel", Advanced Materials Research, Vols. 236-238, pp. 159-163, 2011