摘要
[目的]通过差示扫描量热-热重(DSC-TG)分析和反应量热(RC1),开展烯草酮合成工艺的热危险性和反应动力学研究。[结果]中间体O-3-氯-2-丙烯基羟胺分解温度为106.9℃,5-(2-乙硫基丙基)-2-丙酰基-3-羟基-2-环己烯-1-酮的吸热分解温度为273.3℃,烯草酮表现为吸热和放热2段分解过程,放热和吸热分解温度分别为120、268.2℃。烯草酮合成反应摩尔放热量为-49.03 kJ/mol,绝热温升为21.27 K,反应存在大量热累积。热失控条件下,反应体系最高温度(MTSR)为54.27℃,小于中间体、产品的分解温度和体系沸点,合成工艺的热危险性较小。烯草酮合成反应对O-3-氯-2-丙烯基羟胺的反应级数为1.21。
[Aims] The thermal hazards and kinetics of synthesis reaction were tested by using Differential Scanning Calorimetry-Thermogravimetric analyzer （DSC-TG） and Reaction Calorimeter （RC1）. [Results] The results indicated that the endothermic decomposition temperature of O-（3-chloro-2-propenyl）hydroxylamine is 106.9 ℃, and 5-（2-（ethylthio）propy）-2-propionyl-3-hydroxy-2-cyclohexen-l-one is 273.3 ℃, the exothermic and endothermic decomposition temperature of ctethodim is 120 and 268.2 ℃ respectively. The exothermic energy of the synthesis reaction is -49.03 kJ/mol, the adiabatic temperature rise is 21.27 K, and the reaction has a lot of thermal accumulation. Under the thermal runaway condition, the maximum temperature of the synthesis reaction （MTSR） is 54.27 ℃, which is below the thermal decomposition temperature of intermediate, product and the boiling point of the reaction system. This process has lower thermal hazard. The synthesis reaction order is 1.21 for O-（3-chloro-2-propenyl）hydroxylamine.
出处
《农药》
CAS
CSCD
北大核心
2014年第2期99-101,125,共4页
Agrochemicals
关键词
烯草酮
绝热温升
分解温度
热危险性
动力学
clethodim
adiabatic temperature rise
decomposition temperature
thermal hazards
kinetic
