工艺毒物对邻苯二甲酸酯后负载Ziegler - Natta催化剂气相丙烯聚合性能的影响

IF 1.8 4区 工程技术 Q3 ENGINEERING, CHEMICAL
Abdulrahman Albeladi, Akhlaq Moman, Timothy F. L. McKenna
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引用次数: 0

摘要

采用两种方法考察了常见工艺毒物对第六代Ziegler-Natta催化剂在丙烯气相聚合过程中性能的影响:不经纯化或用一组或两组纯化柱引入丙烯,以及在聚合过程中引入二氧化碳(CO2)、氧气(O2)、水(H2O)、甲醇(CH3OH)、乙酸乙酯(C4H8O2)和二甲亚砜(C2H6SO)。正如预期的那样,净化柱显著提高了催化剂的活性,略微降低了催化剂的衰变。在反应过程中注入TiBA导致活性增加。两套色谱柱的加入大大提高了聚合反应的重复性。聚合反应中注入毒物的失活功率为:O2 >二氧化碳比;CH3OH祝辞C2H6SO祝辞C4H8O2祝辞H2O。加入CO2、O2和CH3OH导致分子量逐渐降低,而加入H2O几乎没有影响。然而,C4H8O2和C2H6SO导致分子量轻微增加。此外,对结晶性和立体规整性的影响相似,CO2、O2、H2O和CH3OH使结晶性和规整性逐渐降低,而C4H8O2和C2H6SO使结晶性和规整性轻微升高,说明这两种毒物对结晶性和规整性有一定的控制作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Impact of Process Poisons on the Performance of Post-Phthalate Supported Ziegler–Natta Catalysts in Gas Phase Propylene Polymerization

Impact of Process Poisons on the Performance of Post-Phthalate Supported Ziegler–Natta Catalysts in Gas Phase Propylene Polymerization

The impact of common process catalyst poisons on the performance of a 6th generation Ziegler–Natta catalysts during the gas phase polymerization of propylene are examined using two approaches: introducing propylene without purification, or with one or two sets of purification columns, and by introducing carbon dioxide (CO2), oxygen (O2), water (H2O), methanol (CH3OH), ethyl acetate (C4H8O2) and dimethyl sulfoxide (C2H6SO) during the polymerization. As expected, purification columns increases the catalyst activity significantly, slightly reduce catalyst decay. Injecting TiBA during the reaction leads to an activity increase. The addition of two full sets of columns substantially increased the repeatability of polymerization reactions. The power of deactivation of poisons injected during the polymerization reaction is: O2 > CO2 > CH3OH > C2H6SO > C4H8O2 > H2O. Adding CO2, O2, and CH3OH resulted in a progressive decrease in molecular weight while almost no effect is observed with H2O. However, C4H8O2, and C2H6SO resulted in a mild increase in molecular weight. Additionally, the effects on crystallinity and stereoregularity are similar where CO2, O2, H2O and CH3OH caused a progressive decrease while C4H8O2 and C2H6SO resulted in a mild increase, indicating some isotacticity control by these two poisons.

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来源期刊
Macromolecular Reaction Engineering
Macromolecular Reaction Engineering 工程技术-高分子科学
CiteScore
2.60
自引率
20.00%
发文量
55
审稿时长
3 months
期刊介绍: Macromolecular Reaction Engineering is the established high-quality journal dedicated exclusively to academic and industrial research in the field of polymer reaction engineering.
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