Brazilian Journal of Chemical Engineering COMPARISON OF TECHNIQUES FOR THE DETERMINATION OF CONVERSION DURING SUSPENSION POLYMERIZATION REACTIONS
Brazilian Journal of Chemical Engineering COMPARISON OF TECHNIQUES FOR THE DETERMINATION OF CONVERSION DURING SUSPENSION POLYMERIZATION REACTIONS
复制标题
巴西化学工程杂志悬浮聚合反应期间转化率测定技术的比较
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
P. H. H. Araújo
中科院分区：
文献类型：
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作者：
J. C. Santos;C. N. Lopes;M. M. Reis;R. Giudici;C. Sayer;R. A. F. Machado;P. H. H. Araújo
由于反应介质的非均质性以及停止搅拌时颗粒快速聚集的趋势，确定悬浮聚合反应期间的转化率并不是一件容易的事。通常，采用安瓿中的本体聚合来研究悬浮聚合反应的动力学。在这项工作中，对悬浮聚合反应期间测定转化率的不同技术进行了比较。结果表明，苯乙烯悬浮聚合期间通过重量分析获得的转化率与使用基于光纤的拉曼光谱的在线转化率监测数据之间具有良好的一致性。然而，由于反应温度稍高，在安瓿中进行的苯乙烯本体聚合的聚合速率高于苯乙烯悬浮聚合的实际反应速率。在数学模型中使用实验温度数据进行的模拟结果证实了这些结果。
The determination of conversion during suspension polymerization reactions is not an easy task due to the heterogeneity of the reaction medium and the tendency of particles to agglomerate rapidly when stirring is stopped. Usually, bulk polymerization in ampoules is employed to study the kinetics of suspension polymerization reactions. In this work, a comparison of different techniques for the determination of conversion during suspension polymerization reactions is presented. Results showed a good agreement between the conversion obtained by gravimetry during styrene suspension polymerization and on-line conversion monitoring data using fiber-optic based Raman Spectroscopy. Nevertheless, the polymerization rate of styrene bulk polymerization carried out in ampoules was higher than the real reaction rate of styrene suspension polymerization due to slightly higher reaction temperatures. Simulation results using the experimental temperature data in a mathematical model confirmed these results.