脂肪酸酯在TG-DSC下的挥发与氧化特性

doi:10.3969/j.issn.0253-2417.2014.05.022

Abstract

Abstract: 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 O₂ atmosphere. 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.

Key words: ester, volatilization, oxidation, TG-DSC

CLC Number:

TQ35

MEI De-qing, ZHANG Yong-tao, TAN Wen-bing, YUAN Yin-nan. Volatilization and Oxidation Properties of Fatty Acid Methyl Esters Based on TG-DSC[J]. Chemistry and Industry of Forest Products, 2014, 34(5): 133-138.

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

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