乙烯气相聚合过程中氢气振荡操作制备双峰聚乙烯  

Bimodal polyethylene produced by oscillating operation of hydrogen in single gas-phase polymerization reactor

作　　者：历伟[1] 黄杏冰[1,2] 王靖岱[1] 阳永荣[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,化学工程联合国家重点实验室浙江大学聚合反应工程实验室,浙江杭州310027 [2]公安部上海消防研究所,上海200032

出　　处：《化工学报》2009年第2期365-371,共7页CIESC Journal

基　　金：国家自然科学基金项目(20676114,20490205);国家高技术研究发展计划项目(2007AA030208)~~

摘　　要：在单一气相反应器中,采用国产APE-1G（Cp＊2ZrCl2·2LiCl·THF）型茂金属催化剂,通过强制振荡反应器内的氢气浓度制备双峰聚乙烯。实验考察了氢气浓度、振荡时间分配和振荡周期对聚乙烯分子量分布的影响。实验结果表明,氢气的加入使得催化剂活性降低,产物分子量也减小。通过强制振荡氢气的浓度可以得到双峰分布的聚乙烯,Mw/Mn达到11.2-34.2。研究表明,通过调节氢气振荡操作的实验条件,尤其是调节振荡时间分配,可以很好地控制双峰聚乙烯的分子量分布。A novel technology was presented to produce bimodal polyethylene with home-made metallocene catalyst APE-1G（Cp; ZrC12 · 2LiCl· THF） in single gas phase reactor through oscillating operation of hydrogen periodically. The effects of hydrogen concentration, oscillating time distribution and oscillating operation period on molecular weight distributions were studied. The results showed that catalyst activity and molecular weight of the obtained polymers decreased due to the addition of hydrogen. Bimodal polyethylene obtained through oscillating hydrogen concentration periodically had a polydispersity index （PDI） range from 11.2 to 34.2. It was viable to control molecular weight distributions of bimodal polyethylene through hydrogen oscillating operation, especially through changing the oscillating operation period.

关 键 词：双峰聚乙烯 氢气 茂金属催化剂 振荡操作 气相聚合 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] U469.72[机械工程—车辆工程]