Understanding vinyl acetate polymerization accidents

Chemical Health and Safety Pub Date : 2005-11-01 DOI:10.1016/j.chs.2005.07.013

Jean-Louis Gustin

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引用次数: 18

Abstract

Vinyl acetate is processed to produce polymers and copolymers used in water based paints, adhesives, paper coatings or non-woven binders and various applications at moderate temperatures. The polymerization processes used include solution, suspension and emulsion processes. Many incidents involving the runaway polymerization of vinyl acetate monomers (VAM) are known.

In processes where the polymerization initiator was dissolved in the monomer, the initiator premix polymerized violently in the premix vessel.

In polymerization processes where vinyl acetate monomer conversion ratio was not 100%, storages of recycled monomers containing no polymerization inhibitor and possibly some traces of polymerization initiator exploded due to VAM violent bulk polymerization.

Incidents happened either in batch or semi-batch polymerization processes in connection with wrong initiator introduction.

In this paper, a review of polymerization incidents is given. Radical chain polymerization kinetics are used to explain some accident features such as polymerization isothermal induction periods. Experimental results on bulk VAM polymerization are given.

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了解醋酸乙烯聚合事故

醋酸乙烯被加工成聚合物和共聚物，用于水性涂料、粘合剂、纸张涂料或无纺布粘合剂和各种中等温度下的应用。聚合工艺包括溶液法、悬浮法和乳液法。许多事件涉及失控聚合醋酸乙烯单体(VAM)是已知的。在聚合引发剂溶解于单体的过程中，引发剂预混料在预混料容器中发生剧烈聚合。在醋酸乙烯单体转化率不达到100%的聚合过程中，由于VAM剧烈本体聚合，储存的不含聚合抑制剂和可能含有少量聚合引发剂的回收单体发生爆炸。在间歇或半间歇聚合过程中，由于引入了错误的引发剂而发生了事故。本文对聚合事件进行了综述。自由基链聚合动力学用于解释聚合等温诱导期等意外现象。给出了本体VAM聚合的实验结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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