化工学报 ›› 2025, Vol. 76 ›› Issue (2): 695-706.DOI: 10.11949/0438-1157.20240859
• 分离工程 • 上一篇
尤潇楠1(), 范小强1,2(
), 杨遥1,3, 王靖岱1,3, 阳永荣1,3
收稿日期:
2024-07-29
修回日期:
2024-09-19
出版日期:
2025-03-25
发布日期:
2025-03-10
通讯作者:
范小强
作者简介:
尤潇楠(1998—),男,硕士,youxiaonan@zju.edu.cn
基金资助:
Xiaonan YOU1(), Xiaoqiang FAN1,2(
), Yao YANG1,3, Jingdai WANG1,3, Yongrong YANG1,3
Received:
2024-07-29
Revised:
2024-09-19
Online:
2025-03-25
Published:
2025-03-10
Contact:
Xiaoqiang FAN
摘要:
超临界乙烯和高压聚乙烯混合物的减压分离过程涉及超临界乙烯与多分散性聚乙烯的复杂两相流动和相变传质过程,现有模型不仅缺少有效的数据验证,而且并不具备准确预测多分散性聚乙烯蜡分子量分布的能力。因此,首先对高压聚乙烯及其聚乙烯蜡的分子链结构进行表征分析,然后根据分离机理提出了一种预测高压分离器气相出口聚乙烯蜡流量及其分子量分布的建模策略,最后研究了操作条件对聚乙烯蜡产量的影响。研究方法和结果不仅可为高压聚乙烯分离过程的操作优化和产品含蜡量的定向调控提供理论指导,而且可以拓展到其他溶液法工艺的聚合物分离过程,具有重要的意义。
中图分类号:
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.
Xiaonan YOU, Xiaoqiang FAN, Yao YANG, Jingdai WANG, Yongrong YANG. Modeling method of depressurization separation process of the mixture of high-pressure polyethylene and supercritical ethylene[J]. CIESC Journal, 2025, 76(2): 695-706.
参数 | C2H4 | LDPE |
---|---|---|
kij | -0.0568708 | |
m | 1.522416 | 0.04131746M |
σ | 3.4882223 | 3.4750711 |
ε/kB | 181.331214 | 267.179575 |
表1 PC-SAFT状态方程中的纯组分参数[19]
Table 1 Pure component parameters in the PC-SAFT equation of state[19]
参数 | C2H4 | LDPE |
---|---|---|
kij | -0.0568708 | |
m | 1.522416 | 0.04131746M |
σ | 3.4882223 | 3.4750711 |
ε/kB | 181.331214 | 267.179575 |
图4 超临界乙烯-聚乙烯分离机理示意图(黑色代表聚乙烯相,白色代表乙烯相,灰色代表均一相)
Fig.4 Schematic diagram of the supercritical ethylene-polyethylene separation mechanism (black represents the polyethylene phase, white represents the ethylene phase, gray represents the homogeneous phase)
数据 | Mn | Mw | PDI |
---|---|---|---|
原始数据(PE-B) | 15390 | 106031 | 6.9 |
46个伪组分 | 17419 | 121314 | 7.0 |
91个伪组分 | 16351 | 112950 | 6.9 |
226个伪组分 | 15746 | 108571 | 6.9 |
表2 聚乙烯产品(PE-B)分子量分布数据处理前后对比
Table 2 Comparison of molecular weight distribution data for polyethylene product (PE-B) before and after data processing
数据 | Mn | Mw | PDI |
---|---|---|---|
原始数据(PE-B) | 15390 | 106031 | 6.9 |
46个伪组分 | 17419 | 121314 | 7.0 |
91个伪组分 | 16351 | 112950 | 6.9 |
226个伪组分 | 15746 | 108571 | 6.9 |
相关参数 | Model A[ | Model B[ | Model C(this study Ⅰ) |
---|---|---|---|
形成机理 | 相平衡 | 夹带、传质 | 相平衡、气相剪切、减压溶解 |
流量信息 | √ | √ | √ |
分子量分布 | √ | × | √ |
表3 数学模型预测能力对比
Table 3 Comparison of predictive capabilities of mathematical models
相关参数 | Model A[ | Model B[ | Model C(this study Ⅰ) |
---|---|---|---|
形成机理 | 相平衡 | 夹带、传质 | 相平衡、气相剪切、减压溶解 |
流量信息 | √ | √ | √ |
分子量分布 | √ | × | √ |
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