文献类型：期刊文献

中文题名：铬/钒双金属催化剂催化乙烯气相聚合

英文题名：Ethylene polymerization by gas phase process with Cr/V bimetallic catalyst

作者：范大鹏[1,2];谢侃[2];李留忠[2];刘柏平[3];严婕[2]

机构：[1]中国石油化工股份有限公司北京化工研究院,北京市100013;[2]中国石油化工股份有限公司齐鲁分公司研究院,山东省淄博市255400;[3]华东理工大学化工学院,上海市200237

年份：2014

卷号：31

期号：5

起止页码：1

中文期刊名：合成树脂及塑料

外文期刊名：China Synthetic Resin and Plastics

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；

语种：中文

中文关键词：乙烯;双金属催化剂;气相聚合;聚合温度;聚合压力;聚合动力学

外文关键词：ethylene;bimetallic catalyst;gas phase polymerization;polymerization temperature;polymerization pressure;polymerization kinetics

摘要：在实验室小试气相聚合釜中对铬/钒双金属催化剂进行乙烯聚合评价,考察了不同聚合温度和压力时催化剂的性能,研究了不同条件下催化剂的动力学行为,并将其聚合动力学曲线与用工业铬系催化剂的进行了比较。结果表明:随着聚合温度升高,用铬/钒双金属催化剂制备的聚乙烯的相对分子质量减小,熔体流动速率增大,在所研究聚合温度范围内铬/钒双金属催化剂对温度更敏感;随着聚合压力增大,催化剂活性显著提高,聚乙烯相对分子质量增加;聚合动力学曲线与铬系催化剂不同,聚合反应速率先增大再降低最后逐渐达到平稳。
Ethylene polymerization with Cr/V bimetallic catalyst was evaluated in a bench gas phase polymerization reactor in the laboratory. The effects of different polymerization temperatures and pressures on performance of the catalyst were investigated. The polymerization kinetic behavior with Cr/V bimetallic catalyst under different polymerization conditions was studied, and was compared to those with commercial chromium-based catalysts. The results indicate that the relative molecular mass of polyethylene produced decreases while the melt flow rate of the polymer increases in the presence of Cr/V bimetallic catalyst with the rise in the polymerization temperature, and Cr/V bimetallic catalyst is more sensitive to the temperature in the range of polymerization temperatures researched. The catalytic activity increases dramatically and the relative molecular mass of polyethylene rises with the enhancement of the reaction pressure. The polymerization kinetic curve of Cr/V bimetallic catalyst is different from that of chromium-based catalysts, and the polymerization rate with Cr/V bimetallic catalyst increases first, then decreases and reaches a stable state gradually finally.