The thermal stability and composition of the gas phase of the most common technical mixtures of polychlorinated biphenyls of the Sovol and Trikhlorbifenil brands have been studied by simultaneous thermal analysis and mass spectrometry in comparison with their derivatives synthesized by the reaction of these mixtures with sodium methoxide in a medium of dimethyl sulfoxide and methanol. It has been determined for the first time that derivatives of polychlorinated biphenyls are less thermally stable compounds in comparison with the initial substances and, in pyrolysis, undergo not only evaporation but also decomposition to the simplest volatile species. The thermal destruction of the derivatives requires lower energy consumption and is characterized by lower emissions of hazardous chemicals.

中文翻译：

---

多氯联苯工业混合物衍生物的热解

Sovol 和 Trikhlorbifenil 品牌的最常见的多氯联苯技术混合物的热稳定性和气相组成已通过同步热分析和质谱进行了研究，并与这些混合物与甲醇钠反应合成的衍生物进行了比较。二甲亚砜和甲醇的介质。首次确定，与初始物质相比，多氯联苯衍生物的热稳定性较差，并且在热解中不仅会蒸发，还会分解成最简单的挥发性物质。衍生物的热破坏需要较低的能源消耗，其特点是危险化学品的排放量较低。