CAJ | 학술논문

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。
재 N2화 O2분위하,분별대포화지방산갑지( C16∶0화 C18∶0)화불포화지방산갑지(C18∶1)3충순지이급래원우생물유지적혼합지양품진행열중-차시소묘량열법(TG-DSC)연구。연구발현：재N2분위하,C16∶0적기시실중온도위157.3℃,요비C18∶0저；이C18∶1비C18∶0경용역휘발,대응적기시실중온도분별위175.9℃화193.7℃；유3충순지재N2화O2분위하각자기시실중적온도간격가판단출탄련교장적C18∶0착화성능최가,C16∶0여지접근,C18∶1적착화성능최차；3충순지양품적TG-DSC곡선재N2분위하인휘발화열해균정현출흡열봉,이재O2분위하재극렬연소시정현방열봉형。혼합지재불동분위하도정현료여순지상유사적열중특성화열류봉형,기중소점비례교대적조분대혼합지연료특성기착관건성적작용。
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.