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Two-stage decomposition of 2-hydroxyethylhydrazinium nitrate (HEHN)

机译：硝酸2-羟乙基肼硫酸二级分解（Hehn）

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The hydrazine-derived ionic liquid 2-hydroxyethylhydrazinium nitrate (HEHN) is a promising fuel component of green monopropellants. For successful implementation of these propellants, it is necessary to understand the kinetics and mechanism of HEHN decomposition, but the available data are scarce. The objective of the present work was to investigate the kinetics of HEHN thermal decomposition using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) as well as to identify the evolved gas products with mass spectrometry (MS) and Fourier-transform infrared (FTIR) spectroscopy. Both TGA and DSC have revealed that the decomposition of high-purity HEHN has two distinct stages. The effective kinetic parameters of both stages were determined using the Ozawa-Wall-Flynn, Kissinger, and model based methods. The model-based analysis has shown autocatalytic behaviour of the involved reactions and produced apparent activation energies of 113.7 +/- 1.7 kJ/mol at the first stage and 123.6 +/- 2.5 kJ/mol at the second stage, close to the literature data (124.8 kJ/mol) on the autocatalytic reaction between HEHN and HNO3. The evolved gas analysis has shown that the first stage generates H2O, N-2 , NH3, NO, N2O, and NO2, while the second stage also generates HNO3 and CO2. The observed existence of two stages in the thermal decomposition of HEHN could be explained by the formation of a condensed by product, which, in turn, decomposes via a highly activated reaction during the second (high-temperature) stage. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：肼衍生的离子液体2-羟乙酸硝酸羟乙基肼（Hehn）是绿色单普林的有希望的燃料分量。为了成功实施这些推进剂，有必要了解Hehn分解的动力学和机制，但可用的数据是稀缺的。本工作的目的是使用热重分析（TGA）和差示扫描量热法（DSC）来研究Hehn热分解的动力学以及用质谱（MS）和傅立叶变换红外线（FTIR）识别进化的气体产品（FTIR ）光谱学。 TGA和DSC都透露，高纯度Hehn的分解有两个不同的阶段。使用ozawa-wall-flynn，kissinger和基于模型的方法测定两个阶段的有效动力学参数。基于模型的分析表明，在第一阶段和第二阶段的第一阶段和123.6 +/- 2.5 kJ / mol的表观激活能量的自催化能量显示出明显的活化能量。 （124.8 kJ / mol）赫恩和HNO3之间的自催化反应。进化的气体分析表明，第一阶段产生H 2 O，N-2，NH 3，NO，N2O和NO2，而第二阶段也产生HNO3和CO2。观察到Hehn热分解中的两个阶段的存在可以通过形成由产物的浓缩来解释，其又通过在第二（高温）阶段的高度活化反应中分解。 （c）2020燃烧研究所。由elsevier Inc.出版的所有权利保留。

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