生物柴油在低温下析出晶体的热力学规律研究  

CRYSTAL PRECIPITATION LAW OF BIODIESEL AT LOW TEMPERATURES

作　　者：陈五花[1] 陈建[2] 蒋金兴 陈本军 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2] 中国石化青岛炼油化工有限责任公司

出　　处：《石油炼制与化工》2014年第3期14-17,共4页Petroleum Processing and Petrochemicals

基　　金：国家自然科学基金资助项目(No.51206188);山东省优秀中青年科学家科研奖励基金项目(No.BS2013SW032)

摘　　要：以大豆油、地沟油、花生油生物柴油为研究对象,利用黏温曲线法得到了生物柴油的浊点,利用高速离心分离法结合气相色谱法得到生物柴油在不同温度下的结晶量及析出晶体的组成,研究生物柴油在低温下析出晶体的热力学规律。试验结果表明:生物柴油在低温下析出的晶体主要由饱和脂肪酸甲酯组成,且析出的晶体中高碳数脂肪酸甲酯的质量分数大于低碳数脂肪酸甲酯;生物柴油中饱和脂肪酸甲酯的含量越高,浊点越高,低温下的结晶量越多,黏度越大,低温流动性能越差。Based on the viscosity-temperature curves of soybean oil,waste oil and peanut oil biodie-sel ,the cloud points of biodiesels were obtained. The amount and composition of precipitated crystals of biodiesels at different temperatures were measured by high speed centrifugation and gas chromatography （GC）. It is found that the solid filtrated from the biodiesel is not a pure crystal,but a mixed one mainly composed of saturated fatty acid methyl esters （FAMEs ）. The amount of FAMEs with high carbon number is more than that with low carbon number. The higher content of saturated fatty acid methyl es-ter,the higher cloud point and viscosity and the more crystal precipitation as well. The diesel will ex-hibit worse cold flow properties.

关 键 词：生物柴油 脂肪酸甲酯 浊点 结晶量 晶体组成 

分 类 号：TE667[石油与天然气工程—油气加工工程]