基于聚合物分子量分布的乙烯淤浆聚合工艺优化

doi:10.3969/j.issn.0438-1157.2013.02.032

化工学报 ›› 2013, Vol. 64 ›› Issue (2): 649-655.DOI: 10.3969/j.issn.0438-1157.2013.02.032

基于聚合物分子量分布的乙烯淤浆聚合工艺优化

顾雪萍¹, 王艳丽¹, 陈曦², 王嘉骏¹, 冯连芳¹

1. 浙江大学化学工程与生物工程学系,化学工程联合国家重点实验室,浙江杭州 310027;
2. 浙江大学控制科学与工程系,浙江杭州 310027

收稿日期:2012-07-30 修回日期:2012-09-16 出版日期:2013-02-05 发布日期:2013-02-05
通讯作者: 冯连芳
作者简介:顾雪萍(1972—),女,博士,讲师。
基金资助:
国家重点基础研究发展计划项目(2012CB720503)。

Optimization of ethylene slurry polymerization conditions based on molecular weight distribution

GU Xueping¹, WANG Yanli¹, CHEN Xi², WANG Jiajun¹, FENG Lianfang¹

1. State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
2. Department of Control Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2012-07-30 Revised:2012-09-16 Online:2013-02-05 Published:2013-02-05
Supported by:
supported by the National Basic Research Program of China(2012CB720503).

摘要/Abstract

摘要： 分子量及分布是聚合物生产过程中极其重要的质量指标,但目前的技术水平并不能实现分子量及其分布的实时测量,基于反应机理的动态建模是实现其软测量的重要方法。以乙烯淤浆聚合工艺为研究对象,基于聚合机理,分别以聚合物的平均分子量和分子量分布为目标,以循环气中氢气乙烯比为决定变量,采用稳态优化方法求取聚合物生产的工艺条件。结果表明:以平均分子量为优化目标所得的结果与分析值的偏差较大,虽然聚合物的平均分子量符合要求,但聚合物的分子量分布曲线与所需产品的分子量分布曲线之间的最大误差可达0.092;而以分子量分布曲线为目标所得的最大误差只有0.069。因此,以分子量分布曲线作为目标的优化方法明显比常规的以平均分子量为目标的优化方法优越。

关键词: 聚乙烯, 分子量分布, 优化, 聚合

Abstract: Molecular weight and its distribution are extremely important quality indices in the polymer production process,however real-time measurement of molecular weight and its distribution cannot be achieved.Dynamic modeling based on polymerization mechanism is an important method for implementing soft measurement.In this study, the polymerization conditions of the ethylene slurry polymerization plant (HDPE) were investigated based on polymerization mechanism, with polymer average molecular weight and its distribution curve as the target, the ratio of hydrogen to ethylene in recycle gas as the decision variable.The results showed large deviation between the simulation results with the average molecular weight as the optimizing target and those of plant analysis.Although the average molecular weight of the polymer could reach the desired quality, the maximum error between the molecular weight distribution curve from simulation and the desired polymer product could be up to 0.092.However, the maximum error was only 0.069 with the molecular weight distribution curve as the target.Therefore,the optimization method with the molecular weight distribution curve as the target is significantly superior to the conventional optimization method with average molecular weight as the target.

Key words: polyethylene, molecular weight distribution, optimization, polymerization

中图分类号:

TQ325

顾雪萍, 王艳丽, 陈曦, 王嘉骏, 冯连芳. 基于聚合物分子量分布的乙烯淤浆聚合工艺优化[J]. 化工学报, 2013, 64(2): 649-655.

GU Xueping, WANG Yanli, CHEN Xi, WANG Jiajun, FENG Lianfang. Optimization of ethylene slurry polymerization conditions based on molecular weight distribution[J]. CIESC Journal, 2013, 64(2): 649-655.

参考文献 16

[1]	Liu Yanchang(刘彦昌).Influence of molecular weight distribution performance of PE product and the control measures[J].China Synthetic Resin and Plastics(合成树脂及塑料),1999,16(6):31-33
[2]	Ning Yingnan(宁英男), Fan Juanjuan(范娟娟), Mao Guoliang(毛国梁), Niu Lei(牛磊), Yin Xifeng(殷喜丰), Jiang Tao(姜涛). Progress in technology and catalysts for kettle-type slurry HDPE process[J].Chemical Industry and Engineering Progress(化工进展), 2010, 29(2):250
[3]	Cao Jingliang(曹景良), Zou Hairong(邹海荣). Reasons and counter measures form other liquor holding tank wall thinning down of high density polyethylene device[J].Chemical Engineer(化学工程师), 2007, 136(1):39
[4]	Yin Dabin(殷大斌), Bao Zonghong(包宗宏). Analysis on improvement of slurry outside circulation of slurry process for HDPE[J].China Plastics Industry(塑料工业), 2006, 34(5):1
[5]	Ben Daoxiang(贲道祥). Increase in capacity of polymerization reactor for HDPE[J].China Synthetic Resin and Plastics(合成树脂及塑料), 2010, 27(4):41
[6]	Gross J, Sadowski G. Perturbed-chain SAFT:an equation of state based on a perturbation theory for chain molecules[J].Industrial and Engineering Chemistry Research, 2001, 40:1244-1260
[7]	Gross J, Sadowski G. Modeling polymer systems using the perturbed-chain statistical associating fluid theory equation of state[J].Industrial and Engineering Chemistry Research, 2002, 41:1084-1093
[8]	Shen Hang(沈航). Modeling of slurry polyethylene processes using aspen plus. Hangzhou:Zhejiang University, 2006
[9]	Gu Xueping(顾雪萍), Wang Jiajun(王嘉骏), Shen Hang(沈航),Feng Lianfang(冯连芳). Physical properties computation of pure components for ethylene slurry polymerization process[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报), 2007, 21(5):729-733
[10]	Floyd S, Hutchinson R A, Ray W H. Polymerization of olefins through heterogeneous catalysis(Ⅴ):Gas-liquid mass transfer limitations in liquid slurry reactors[J].Journal of Applied Polymer Science, 1986, 32(6):5451-5479
[11]	Gu Xueping(顾雪萍), Feng Lianfang(冯连芳), Wang Jiajun(王嘉骏), Tang Zhiwu(汤志武), Liu Bo(刘波).Simulation for grade transition of ethylene slurry polymerization process[J].Sciencepaper Online(中国科技论文在线), 2008, 3(12):915-918
[12]	Takamatsu T, Shioya S, Okada Y. Molecular weight distribution control in a batch polymerization reactor[J].Industrial and Engineering Chemistry Research, 1988, 27:93-99
[13]	Chang J S, Lai J L. Computation of optimal temperature policy for molecular weight control in a batch polymerization reactor[J].Industrial and Engineering Chemistry Research, 1992, 31(3):861-868
[14]	Crowley T J, Choi K Y. Calculation of molecular weight distribution from molecular weight moments in free radical polymerization[J].Industrial and Engineering Chemistry Research, 1997,36(5):1419-1423
[15]	Crowley T J, Choi K Y. Discrete optimal control of molecular weight distribution in a batch free radical polymerization process[J].Industrial and Engineering Chemistry Research, 1997, 36(9):3676-3684
[16]	Vicente M, Sayer C, Leiza J R, Arzamendi G, Lima E L, Pinto J C, Asua J M. Dynamic optimization of non-linear emulsion copolymerisation systems open-loop control of composition and molecular weight distribution[J].Chemical Engineering Journal, 2002, 85(2/3):339-349

基于聚合物分子量分布的乙烯淤浆聚合工艺优化

Optimization of ethylene slurry polymerization conditions based on molecular weight distribution

PDF (PC)

可视化

被引次数

摘要/Abstract

引用本文

使用本文

参考文献 16

相关文章 15

编辑推荐

Metrics

本文评价

[1]	杨欣, 王文, 徐凯, 马凡华. 高压氢气加注过程中温度特征仿真分析[J]. 化工学报, 2023, 74(S1): 280-286.
[2]	何松, 刘乔迈, 谢广烁, 王斯民, 肖娟. 高浓度水煤浆管道气膜减阻两相流模拟及代理辅助优化[J]. 化工学报, 2023, 74(9): 3766-3774.
[3]	陈哲文, 魏俊杰, 张玉明. 超临界水煤气化耦合SOFC发电系统集成及其能量转化机制[J]. 化工学报, 2023, 74(9): 3888-3902.
[4]	齐聪, 丁子, 余杰, 汤茂清, 梁林. 基于选择吸收纳米薄膜的太阳能温差发电特性研究[J]. 化工学报, 2023, 74(9): 3921-3930.
[5]	陈国泽, 卫东, 郭倩, 向志平. 负载跟踪状态下的铝空气电池堆最优功率点优化方法[J]. 化工学报, 2023, 74(8): 3533-3542.
[6]	刘文竹, 云和明, 王宝雪, 胡明哲, 仲崇龙. 基于场协同和耗散的微通道拓扑优化研究[J]. 化工学报, 2023, 74(8): 3329-3341.
[7]	邢雷, 苗春雨, 蒋明虎, 赵立新, 李新亚. 井下微型气液旋流分离器优化设计与性能分析[J]. 化工学报, 2023, 74(8): 3394-3406.
[8]	孟令玎, 崇汝青, 孙菲雪, 孟子晖, 刘文芳. 改性聚乙烯膜和氧化硅固定化碳酸酐酶[J]. 化工学报, 2023, 74(8): 3472-3484.
[9]	张曼铮, 肖猛, 闫沛伟, 苗政, 徐进良, 纪献兵. 危废焚烧处理耦合有机朗肯循环系统工质筛选与热力学优化[J]. 化工学报, 2023, 74(8): 3502-3512.
[10]	诸程瑛, 王振雷. 基于改进深度强化学习的乙烯裂解炉操作优化[J]. 化工学报, 2023, 74(8): 3429-3437.
[11]	吴文涛, 褚良永, 张玲洁, 谭伟民, 沈丽明, 暴宁钟. 腰果酚生物基自愈合微胶囊的高效制备工艺研究[J]. 化工学报, 2023, 74(7): 3103-3115.
[12]	汤晓玲, 王嘉瑞, 朱玄烨, 郑仁朝. 基于Pickering乳液的卤醇脱卤酶催化合成手性环氧氯丙烷[J]. 化工学报, 2023, 74(7): 2926-2934.
[13]	文兆伦, 李沛睿, 张忠林, 杜晓, 侯起旺, 刘叶刚, 郝晓刚, 官国清. 基于自热再生的隔壁塔深冷空分工艺设计及优化[J]. 化工学报, 2023, 74(7): 2988-2998.
[14]	张澳, 罗英武. 低模量、高弹性、高剥离强度丙烯酸酯压敏胶[J]. 化工学报, 2023, 74(7): 3079-3092.
[15]	王杰, 丘晓琳, 赵烨, 刘鑫洋, 韩忠强, 许雍, 蒋文瀚. 聚电解质静电沉积改性PHBV抗氧化膜的制备与性能研究[J]. 化工学报, 2023, 74(7): 3068-3078.