Predictive control of molecular weight distribution in polymerization reaction based on moment of MWD

SHEN Shanhua; CAO Liulin; WANG Jing

doi:10.3969/j.issn.0438-1157.2013.12.016

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Predictive control of molecular weight distribution in polymerization reaction based on moment of MWD

更新时间：2025-12-10

- Predictive control of molecular weight distribution in polymerization reaction based on moment of MWD
- CIESC Journal Issue 12, Pages: 4379-4384(2013)
- 作者机构：
  
  北京化工大学信息科学与技术学院,北京,100029
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.12.016
  CLC： P273
- Online First：05 December 2013，
  
  Published：05 December 2013
- 稿件说明：
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SHEN Shanhua, CAO Liulin, WANG Jing. Predictive control of molecular weight distribution in polymerization reaction based on moment of MWD[J]. CIESC Journal, 2013, (12): 4379-4384.
DOI：

SHEN Shanhua, CAO Liulin, WANG Jing. Predictive control of molecular weight distribution in polymerization reaction based on moment of MWD[J]. CIESC Journal, 2013, (12): 4379-4384. DOI： 10.3969/j.issn.0438-1157.2013.12.016.

摘要

聚合物分子量分布（molecular weight distribution，MWD）是聚合产物重要的质量指标，由于无法在线测量，使得直接质量控制至今难以实现。在利用Legendre正交多项式组合神经网络建立聚合反应分子量分布灰箱模型的基础上，把MWD这个三维空间控制问题解构为以其矩向量为特征的二维时间域的控制问题，提出了通过控制分布的矩值实现分子量分布的预测控制方法。目标函数以矩值误差平方和为基础，考虑控制变量的约束条件，同时引入可测低阶矩的修正项，使得分子量分布的部分闭环反馈控制得以实现。该方法以实验室规模的苯乙烯聚合过程为对象进行了仿真建模与控制研究，获得良好的控制效果，证明了方法的有效性。

Abstract

Molecular weight distribution (MWD) of polymer is an important performance index of quality.Due to the MWD can't be measured online

direct quality control is difficult to achieve.The combined of Legendre orthogonal polynomial and neural network had been used to build the model of the MWD

then the MWD tracking control in three-dimensionals space were decomposed the tracking control of its distribution moment in two-dimensionals time domain. The mothod

which employed the moments of distribution to predict the MWD

was proposed. The optimal objective function was based on the sum of squared errors (SSE) of the moments under certain constraints

meanwhile the correction term of the lower order moments was also introduced

in which part of the closed-loop feedback control of MWD can be obtained.The proposed control method was tested on styrene polymerization reaction in CSTR

and perfect control performance shows the effectiveness of the work.

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