Department of Environmental and Natural Resources Management, University of Western Greece (formerly of University of Ioannina), Seferi 2, Agrinio GR30100, Greece.
Department of Environmental and Natural Resources Management, University of Western Greece (formerly of University of Ioannina), Seferi 2, Agrinio GR30100, Greece.
J Hazard Mater. 2013 Jun 15;254-255:382-389. doi: 10.1016/j.jhazmat.2013.03.031. Epub 2013 Mar 22.
Thermal decomposition of hydroxylamine, NH2OH, was responsible for two serious accidents. However, its reactive behavior and the synergy of factors affecting its decomposition are not being understood. In this work, the global enthalpy of hydroxylamine decomposition has been measured in the temperature range of 130-150 °C employing isoperibolic calorimetry. Measurements were performed in a metal reactor, employing 30-80 ml solutions containing 1.4-20 g of pure hydroxylamine (2.8-40 g of the supplied reagent). The measurements showed that increased concentration or temperature, results in higher global enthalpies of reaction per unit mass of reactant. At 150 °C, specific enthalpies as high as 8 kJ per gram of hydroxylamine were measured, although in general they were in the range of 3-5 kJ g(-1). The accurate measurement of the generated heat was proven to be a cumbersome task as (a) it is difficult to identify the end of decomposition, which after a fast initial stage, proceeds very slowly, especially at lower temperatures and (b) the environment of gases affects the reaction rate.
羟胺（NH2OH）的热分解导致了两起严重事故。然而，人们对其反应行为以及影响其分解的因素协同作用并不了解。在这项工作中，我们采用等压量热法在 130-150°C 的温度范围内测量了羟胺分解的总焓。测量在金属反应器中进行，使用 30-80ml 溶液，其中含有 1.4-20g 纯羟胺（2.8-40g 供应试剂）。测量结果表明，反应物浓度或温度的增加会导致单位质量反应物的总反应焓更高。在 150°C 时，测量到的特定焓高达 8kJ/g 羟胺，尽管通常在 3-5kJ/g 范围内。证明准确测量生成的热量是一项繁琐的任务，原因是 (a) 难以确定分解的终点，因为在快速初始阶段之后，特别是在较低温度下，分解进行得非常缓慢，以及 (b) 气体环境会影响反应速率。
