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有机化合物在光窗上的结焦严重地影响激光引发化学反应及光学原位实时探测。本文报道在1,2-二氯丙烷反应系统中,光窗结焦现象同时存在于激光引发反应及热反应过程中。对光窗在300℃条件下的结焦机理研究表明,少量氧气在光窗结焦过程中起关键作用。结焦前驱体的红外光谱研究表明,前驱体的可能结构为1-丙炔-1,3二醇的缩聚体。该化合物极易通过缩聚反应形成更大的分子,最终导致光窗结焦。对系统及反应物进行彻底除氧,光窗结焦现象大为改善。
Coking of organic compounds on the light window severely affects the laser induced chemical reaction and optical in situ real-time detection. This paper reports that in the 1,2-dichloropropane reaction system, the cohesion of light window coexists in both the laser induced reaction and the thermal reaction. The study on the coking mechanism of the window at 300 ℃ shows that a small amount of oxygen plays a key role in the coking of the window. Infrared spectroscopic studies of coked precursors showed that the possible structure of the precursors is a polycondensate of 1-propyne-1,3-diol. The compound easily forms larger molecules by polycondensation reactions, eventually leading to coking of the light window. The system and reactants to complete oxygen, window coke phenomenon greatly improved.