Study on cold flow properties for biodiesel
The chemical composition of biodiesel was analyzed by gas chromatography-mass spectrometry. The cold filter plugging point of biodiesel was measured according to GB/T 20828-2007. The cold flow properties of biodiesel were investigated on the basis of the crystallization theory, including chemical composition and molecular structure. Biodiesel might be considered a pseudobinary mixture, namely, high-melting-point saturated fatty acid methyl esters and low-melting-point unsaturated ones. Bilayer crystal structure of biodiesel was founded. Bilayer structure with headgroups aligned next to each other inside the crystal and away from nonpolar bulk liquid was large platelet lamellae. The results showed that biodiesei was mainly composed of saturated fatty acid methyl esters (C140 ～C240) and unsaturated ones(C161～C221, C182 and C183). The cold flow properties for biodiesel were determined mainly by the amount and molecular structure of saturated fatty acid methyl esters. The long-straight-chain saturated fatty acid methyl esters tend to have relatively poor cold flow properties. The cold flow properties worsen with increasing the amount and carbon chain length of straight-chain saturated fatty acid methyl esters. The ways of adjusting biodiesel composition and treating with depression of cold filter plugging point were given; they could improve cold flow properties.
Biodiesel Cold flow properties Crystallization GC-MS
Xiu CHEN Yin-nan YUAN Yong-bin LAI Li-ping WANG
Jiangsu University,Zhenjiang 212013,Jiangsu,China Jiangnan niversity,Wuxi 214122 Jiangsu,China
国际会议
广州
英文
509-514
2008-12-03（万方平台首次上网日期，不代表论文的发表时间）