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Thermal Decomposition of Phosgene and Diphosgene
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1021/acs.jpca.7b09554
Juan-Carlos Lizardo-Huerta 1 , Baptiste Sirjean 1 , Laurent Verdier 2 , René Fournet 1 , Pierre-Alexandre Glaude 1
Affiliation  

Phosgene (COCl2) is a toxic compound used or formed in a wide range of applications. The understanding of its thermal decomposition for destruction processes or in the event of accidental fire of stored reserves is a major safety issue. In this study, a detailed chemical kinetic model for the thermal decomposition and combustion of phosgene and diphosgene is proposed for the first time. A large number of thermo-kinetic parameters were calculated using quantum chemistry and reaction rate theory. The model was validated against experimental pyrolysis data from the literature. It is predicted that the degradation of diphosgene is mainly ruled by a pericyclic reaction producing two molecules of phosgene and, to a lesser extent, by a roaming radical reaction yielding CO2 and CCl4. Phosgene is much more stable than diphosgene under high-temperature conditions, and its decomposition starts at higher temperatures. Decomposition products are CO and Cl2. An equimolar mixture of the latter molecules can be considered as a surrogate of phosgene from the kinetic point of view, but the important endothermic effect of the decomposition reaction can lead to different behaviors, for instance, in the case of autoignition under high pressure and high temperature.

中文翻译:

光气和双光气的热分解

光气(COCl 2)是一种有毒的化合物,在广泛的应用中使用或形成。一个重要的安全问题是了解其在销毁过程中的热分解或在储藏物意外着火的情况下的安全性。在这项研究中,首次提出了光气和双光气热分解和燃烧的详细化学动力学模型。使用量子化学和反应速率理论计算了大量的热动力学参数。该模型已针对来自文献的实验热解数据进行了验证。据预测,双光气的降解主要由产生两个光气分子的周环反应决定,而在较小程度上由产生CO 2和CCl的漫游自由基反应决定4。在高温条件下,光气比双光气稳定得多,并且其分解在较高温度下开始。分解产物为CO和Cl 2。从动力学的观点来看,后者分子的等摩尔混合物可以被认为是光气的替代物,但是分解反应的重要吸热作用会导致不同的行为,例如在高压和高压下自燃的情况下。温度。
更新日期:2017-12-26
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