PVA平均聚合度的优化控制方法及其生产应用

Optimal Control Measures for Average Polymerization Degree of PVA and Its Production Applications

关键词:  聚乙烯醇  平均聚合度  聚合率  优化控制

Key words:  polyvinyl alcohol(PVA)  average polymerization degree  conversion of polymerization  optimal control

摘要:

深入分析了影响PVA平均聚合度的因素,提出了控制PVA平均聚合度的工艺优化措施。根据自由基聚合反应的特点,结合大量生产数据,推导出了平均聚合度与甲醇配比、聚合率的量化关系式。在甲醇配比引入上述关系式的基础上,进一步建立了聚合率、甲醇配比、引发剂添加率、反应时间四者的量化关系式,使之适用范围更宽。通过将优化控制方法应用于多品种的开发和生产中,发现对PVA产品平均聚合度的稳定控制起到了良好效果。

Abstract:

In this paper,the optimal control measures for average polymerization degrees of polyvinyl alcohol(PVA) were proposed by thoroughly analyzing the main influence factors.Based on the reaction mechanism of free radical polymerization and the large amount of production data,the quantification relationship of average polymerization degree of PVA with methanol ratio and conversion of polymerization was derived.With introduction of methanol ratio into the above equation,the quantification relationship among the polymerization exponent,methanol ratio,concentration of initiator and reaction time was further determined for a wider application scope.The optimal control was proved to have favorable effects on the polymerization average degree of PVA by practical production and development of multiple products.