醋酸乙烯聚合体系热失控风险评估及失控抑制

Risk assessment and inhibition of thermal runaway in vinyl acetate polymerization system

为实现对醋酸乙烯(VAC)聚合反应热失控行为的风险评估及紧急抑制,采用VSP2绝热量热仪对醋酸乙烯聚合反应体系在不同危险场景条件下的热失控过程和失控抑制进行试验模拟。依据苏黎世危险性分析法(ZHA)中的失控反应严重度评估判据,评估醋酸乙烯聚合反应的热失控风险程度,提出紧急情况下抑制剂的加入时间及加入量。结果表明,醋酸乙烯聚合反应失控后绝热温升(ΔT_(ad))超过100℃,最大反应速率到达时间(TMRad)约为10 min,其热失控风险程度仅次于不可接受水平。聚合体系温度不高于73℃时,通过加入不低于参与聚合反应的醋酸乙烯质量20%的常温溶剂,可有效阻止失控反应发生。

In order to evaluate the thermal runaway risk of the VAC polymerization system and to develop an emergency inhibition methodology,an experimental study was made by using an adiabatic calorimeter VSP2. The associated runaway risk was evaluated and the proper adding time and amount of the inhibitor were determined based on the ZHA hazard analysis method. The results show that the risk is second to the most dangerous,the ΔT_（ad） is over 100 ℃,and TMRad is around 10 min,and that the runaway could be effectively suppressed by the addition of solvent（ no less than 20% VAC in mass） when the system temperature is below 73 ℃.