化工学报2025，Vol.76Issue(2)：695-706,12.DOI:10.11949/0438-1157.20240859
超临界乙烯和高压聚乙烯混合物的减压分离过程建模方法
Modeling method of depressurization separation process of the mixture of high-pressure polyethylene and supercritical ethylene
摘要
Abstract
The depressurization separation process of the mixture of high-pressure polyethylene and supercritical ethylene involves complex two-phase flow and phase change mass transfer process between supercritical ethylene and polydisperse polyethylene.The existing models not only lack effective data verification,but also do not have the ability to accurately predict the molecular weight distribution of polydisperse polyethylene wax.Therefore,this paper first characterizes the molecular chain structure of high-pressure polyethylene and its polyethylene wax.Then,based on the separation mechanism,a modeling strategy for predicting the flow rate and molecular weight distribution of polyethylene wax at the gas phase outlet of the high-pressure separator is proposed.Finally,the effect of operating conditions on the yield of polyethylene wax is studied.The research methodology and results will not only provide theoretical guidance for optimizing the high-pressure polyethylene separation process and the targeted regulation of the wax content in the product,but also can be extended to the polymer separation process of other solution polymerization processes,which is of great significance.关键词
高压聚乙烯/相平衡/减压分离/选择性夹带/模型/两相流Key words
high-pressure polyethylene/phase equilibria/depressurization separation/selective entrainment/model/two-phase flow分类
化学工程引用本文复制引用
尤潇楠,范小强,杨遥,王靖岱,阳永荣..超临界乙烯和高压聚乙烯混合物的减压分离过程建模方法[J].化工学报,2025,76(2):695-706,12.基金项目
工信部2022年高质量发展专项(TC220A04W-3、188) （TC220A04W-3、188）
