脂肪酸酯在TG-DSC下的挥发与氧化特性  

Volatilization and Oxidation Properties of Fatty Acid Methyl Esters Based on TG-DSC

作　　者：梅德清[1] 张永涛[1] 谭文兵[1] 袁银男[2] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]南通大学机械工程学院,江苏南通226019

出　　处：《林产化学与工业》2014年第5期133-138,共6页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(51076069);江苏高校优势学科建设工程资助项目(苏政办发〔2011〕6号)

摘　　要：在N2和O2氛围下,分别对饱和脂肪酸甲酯(C16∶0和C18∶0)和不饱和脂肪酸甲酯(C18∶1)3种纯酯以及来源于生物油脂的混合酯样品进行热重-差示扫描量热法(TG-DSC)研究。研究发现:在N2氛围下,C16∶0的起始失重温度为157.3℃,要比C18∶0低;而C18∶1比C18∶0更容易挥发,对应的起始失重温度分别为175.9℃和193.7℃;由3种纯酯在N2和O2氛围下各自起始失重的温度间隔可判断出碳链较长的C18∶0着火性能最佳,C16∶0与之接近,C18∶1的着火性能最差;3种纯酯样品的TG-DSC曲线在N2氛围下因挥发和热解均呈现出吸热峰,而在O2氛围下在剧烈燃烧时呈现放热峰形。混合酯在不同氛围下都呈现了与纯酯相类似的热重特性和热流峰形,其中所占比例较大的组分对混合酯燃料特性起着关键性的作用。Based on the analysis of thermogravimetry-differential scanning calorimeter（ TG-DSC）,three pure fatty acid esters such as saturated methyl palmitate（ C16∶ 0）,methyl stearate（ C18∶ 0） and unsaturated methyl oleate（ C18∶ 1） and their mixture from bio-fuel were chosen to investigate their volatilization and oxidation characteristics under N2 and O2atmosphere. Under N2 atmosphere,it was found that the volatilization start temperature of C16∶ 0 is 157. 3 ℃,which is lower than that of C18∶ 0.However,C18∶ 1 is much easier to volatile than C18∶ 0,and the volatilization start temperature of C18∶ 0 and C18∶ 1 are 193. 7 ℃and 175. 9 ℃,respectively. Based on the thermal properties of three pure esters under N2 atmosphere and O2 atmosphere,it could be concluded that the C18∶ 0 performed the best ignitability,and the ignition performance of C16∶ 0 is close to that of C18∶ 0,while the ignition performance of C18∶ 1 is the weakest. All the TG-DSC curves of three pure esters present the endothermic peaks under N2 atmosphere because of volatilization and pyrolysis,while the exothermic peaks could be found under O2 atmosphere due to intense oxidation. The esters mixture has exhibited the similar thermo gravimetric characteristics and heat flow shapes with the pure esters under different atmospheres. The most abundant cardinal component in the esters mixture plays a dominant part on the fuel properties of the mixture esters.

关 键 词：酯 挥发 氧化 TG-DSC 

分 类 号：TQ35[化学工程]