四聚乙醛的谱学行为及燃烧特性研究

Study on Spectroscopic Behaviors and Combustion Properties of Metaldehyde

为研究四聚乙醛的燃烧特性,利用差热分析仪、红外光谱仪和光纤光谱仪测试了该物质的谱学行为。基于热谱,提出了四聚乙醛的热解反应历程及燃烧发光机理,并利用燃烧光谱予以验证。结果表明:四聚乙醛的热谱包括升华和热分解两个阶段,热解后的剩余产物为凝聚态的C。结合四聚乙醛的热解反应历程,提出了其燃烧发光机理,分析得出四聚乙醛燃烧时发出黄色火焰,这是由于凝聚态的碳燃烧产生的,燃烧火焰光谱在591.35nm处黄光区出现最大峰支持了这一结论的正确性。

In order to research the burning properties of metaldehyde, the spectroscopic be- haviors of metaldehyde were measured by differential thermal analysis method and photoe- lectric detection technology. Based on the thermography, its thermal decomposition and pos- sible combustion luminous mechanism were offered. The results show that the thermography of metaldehyde includes sublimation and thermal decomposition process. And condensed carbon can be produced when metaldehyde heats and decomposes. According to thermal de- composition process of metaldehyde, the possible combustion luminous mechanism is of- fered. It is concluded that metaldehyde burns and produces yellow flame. The above reason is that carbon bums. It has been proved that the combustion spectrum of metaldehyde has single peak at 591.35 nm in the yellow light region.