摘要
Abstract
The solution polymerization mechanism of vinyl acetate is complex,with intense reactions and significant heat release,posing high risks of safety incidents.A thermal runaway model of the vinyl acetate solu-tion polymerization reactor was constructed to explore the evolution characteristics of temperature,pressure and concentration during the thermal runaway process,and to analyze the effects of polymerization inhibitors,sol-vents and initiators on the consequences of thermal runaway and the structure of the resulting polymer.The re-sults showed that due to the high chain transfer constant under thermal runaway,the quality of product indica-tors such as molecular weight and molecular weight distribution decreased significantly.Polymerization inhibitors can significantly delay the thermal runaway of polymerization without changing the final state result of the runa-way.Methanol,as a solvent,can slow down the out-of-control process and reduce the out-of-control tempera-ture,but it could intensify the consumption of vinyl acetate and there was uncertainty in the suppression of pres-sure.Increasing the amount of initiator would aggravate the thermal runaway of the reaction,and this was par-ticularly significant in the low concentration range.The thermal runaway caused by highly active initiators was more severe,and the thermal runaway caused by some low-activity but highly activation energy initiators may be more serious.The relevant research provided a theoretical basis for the safety control and product quality optimi-zation of the polymerization process of vinyl acetate solution.关键词
醋酸乙烯/自由基聚合/热失控/过程安全/过程模拟Key words
vinyl acetate/radical polymerization/thermal runaway/process safety/process simulation分类
安全科学
