Optimal flowsheet configuration of a polymerization process with embedded molecular weight distributions
Optimal flowsheet configuration of a polymerization process with embedded molecular weight distributions
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DOI：
10.1002/aic.15040
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Chen Zhang;Zhijiang Shao;X. Chen;X. Gu;Lianfang Feng;L. Biegler
中科院分区：
文献类型：
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作者：
Chen Zhang;Zhijiang Shao;X. Chen;X. Gu;Lianfang Feng;L. Biegler
本文研究了具有详细分子量分布的聚合过程的最优反应器网络综合问题。基于一个包含嵌入式MWD的工业高密度聚乙烯（HDPE）淤浆过程模型，通过引入分流器，建立了一个全连接的连续搅拌釜式反应器（CSTR）过程超结构。使用这种广义的超结构作为基础，两个非线性规划（NLP）问题的配方，同时最大限度地提高单体转化率和最小化之间的偏差计算和目标分子量分布，开发应用多目标优化（MO）方法。通过系统地操纵一组连续的决策变量来生成不同的最佳流程图配置。几个案例研究，考虑不同规格的随钻测量进行说明所提出的综合方法的有效性和效率。数值结果表明，优化的流程结构克服了传统反应器网络结构的局限性，有助于提高反应器的生产能力，在所需的产品质量。© 2015美国化学工程师学会AIChE J，62：131-145，2016
We consider the optimal reactor network synthesis of a polymerization process with detailed molecular weight distributions (MWDs). Based on an industrial high-density polyethylene (HDPE) slurry process model including an embedded MWD, a fully connected process superstructure of continuous stirred tank reactors (CSTRs) is established through the introduction of splitters. Using this generalized superstructure as a basis, two nonlinear programming (NLP) problem formulations, which simultaneously maximize the monomer conversion and minimize the deviation between the calculated and target MWDs, are developed by applying multiobjective optimization (MO) methods. Different optimal flowsheet configurations are generated by systematically manipulating a set of continuous decision variables. Several case studies that consider different specifications on MWD are conducted to illustrate the effectiveness and efficiency of the proposed synthesis approach. Numerical results show that the optimal flowsheet configurations overcome the limitations of conventional reactor network structures and help to increase reactor productivity at the desired product quality. © 2015 American Institute of Chemical Engineers AIChE J, 62: 131–145, 2016