Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor

Zhenchao Tang; Yuliang Wang; Zhengliang Huang; Yao Yang; Xiaoqiang Fan; Binbo Jiang; Jingdai Wang; Yongrong Yang

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Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor

Updated：2026-01-06

- Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor
- Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor
- 中国化学工程学报（英文版） 2025年82卷第6期页码：67-82
- Affiliations：
  
  1. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University,Hangzhou,China,310027
  2. Ningbo Innovation Center, Zhejiang University,Ningbo,China,315100
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2025
- Accepted：
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Zhenchao Tang, Yuliang Wang, Zhengliang Huang, 等. Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor[J]. 中国化学工程学报（英文版）, 2025,82(6):67-82.

Zhenchao Tang, Yuliang Wang, Zhengliang Huang, Yao Yang, Xiaoqiang Fan, Binbo Jiang, Jingdai Wang, Yongrong Yang. Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor[J]. Chinese Journal of Chemical Engineering, 2025, 82(6): 67-82.
Zhenchao Tang, Yuliang Wang, Zhengliang Huang, 等. Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor[J]. 中国化学工程学报（英文版）, 2025,82(6):67-82. DOI：

Zhenchao Tang, Yuliang Wang, Zhengliang Huang, Yao Yang, Xiaoqiang Fan, Binbo Jiang, Jingdai Wang, Yongrong Yang. Experimental research on the macro- and micro-mixing in the low-density polyethylene autoclave reactor[J]. Chinese Journal of Chemical Engineering, 2025, 82(6): 67-82. DOI：

摘要

Abstract

It has been widely recognized that the mixing process has significant impacts on the performance of low-density polyethylene (LDPE) reactors due to the rapid radical polymerization occurred in the reactors

but how the macro- and micro-mixing affect the reactor performance was still controversial in publications. In this work

a cold-flow LDPE autoclave with multi-feedings was scaled down (1/2) from an industrial reactor and built to systematically investigate the macro- and micro-mixing characteristics of fluid by experiments. Furthermore

the effects of macro- and micro-mixing on the polymerization were comprehensively analyzed. The results showed that according to the delay time

and macro-mixing times

calculated from residence time distribution (RTD) curves

the macro-mixing states are significantly different at various axial positions (

)

especially at lower agitation Reynolds number

. But with the increase of

since the circulation flow in the reactor is strengthened

the

for each feed gradually decreases to 0

and the

at different axial positions tend to be identical. For micro-mixing

the qualities of micro-mixing at different axial positions are similar

and the average micro-mixing time

in the reactor decreases exponentially with the increase of

. Moreover

a fitting model was established. Through the comparison of the chara

cteristic times of macro-mixing (

)

micro-mixing (

) and elementary reactions within the industrial range of

it can be concluded that the properties of LDPE products are dominated by the macro-mixing behavior

and the consumption of initiators is affected by both the macro- and micro-mixing behaviors. This conclusion is of great significance for the design

optimization and operation of LDPE reactors.

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