Preparation of propylene/1-butene polymer alloys by monomer composition switching polymerization: kinetic and reactor models

HUANG Kai; ZHENG Zheng; HU Jijiang; FENG Lianfang; LI Bogeng

doi:10.11949/j.issn.0438-1157.20180984

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Preparation of propylene/1-butene polymer alloys by monomer composition switching polymerization: kinetic and reactor models

更新时间：2025-12-10

- Preparation of propylene/1-butene polymer alloys by monomer composition switching polymerization: kinetic and reactor models
- CIESC Journal Issue 11, Pages: 4693-4701(2018)
- 作者机构：
  
  化学工程联合国家重点实验室, 浙江大学化学工程与生物工程学院,浙江,杭州,310027
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180984
  CLC： Q325.1
- Online First：05 November 2018，
  
  Published：05 November 2018
- 稿件说明：
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HUANG Kai, ZHENG Zheng, HU Jijiang, et al. Preparation of propylene/1-butene polymer alloys by monomer composition switching polymerization: kinetic and reactor models[J]. CIESC Journal, 2018, (11): 4693-4701.
DOI：

HUANG Kai, ZHENG Zheng, HU Jijiang, et al. Preparation of propylene/1-butene polymer alloys by monomer composition switching polymerization: kinetic and reactor models[J]. CIESC Journal, 2018, (11): 4693-4701. DOI： 10.11949/j.issn.0438-1157.20180984.

摘要

采用球形负载型Ziegler-Natta催化剂和单体组成周期性切换的丙丁淤浆共聚合技术，原位制备了聚丙烯/丙丁共聚物合金。将共聚动力学的矩模型与物料衡算相结合，首次建立了单体组成切换的共聚反应器模型。依据实验所得的丙烯实时消耗速率拟合得到模型参数，并模拟计算了不同单体组成切换频率下的聚合反应活性和聚合产物的组成。结果表明，模型能很好地描述各切换频率下丙烯的聚合速率曲线、催化聚合活性，以及合金中1-丁烯的总含量、丙丁无规共聚物的含量和“嵌段”共聚物的含量等。结果还显示，共聚过程中丙烯的脉冲进料有利于提高单体向活性中心的扩散，进而提高聚合速率和聚合活性。

Abstract

Propylene/1-butene polymer alloys were prepared by in-situ slurry polymerization with spherical supported Ziegler-Natta catalyst and the technology of monomer composition switching method. Combining the kinetic model of propylene/1-butene copolymerization and the material balance

a reactor model with the monomer composition switching was developed by the moment method. The model parameters were fitted according to the real-time consumption rate of propylene obtained from experiments. The polymerization reactivity

the product's composition and their changes with switching frequency of monomer composition were simulated. The results show that the model can well describe the polymerization rate at different stages

the catalyst activity

the total content of 1-butene in the alloy

and the contents of random copolymer and “block” copolymer at various switching frequencies. It has been revealed also that the pulse feed of propylene in the copolymerization process is conducive to increasing the monomer diffusion to the active center

thereby increasing the polymerization rate and polymerization activity.

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