载入中....
设为首页 收藏本站 联系我们 网站地图
论文网
您现在的位置: 免费毕业论文网 >> 理学论文 >> 化学工程 >> 正文
搜索: 论文

新型全密度聚乙烯催化剂研究

更新时间 2009-12-16 18:19:04 点击数:

新型全密度聚乙烯催化剂研究
Study of New Full Density Polyethylene Catalyst
【摘要】 制备了聚合物负载的茂金属催化剂PS-DVB-MC ,通过常规的方法对该催化剂进行了全面的表征和分析,并采用淤浆聚合工艺在高压不锈钢反应釜中进行了乙烯均聚和乙烯/ l-己烯共聚合实验的研究。采用相转移法合成了含有烯丙基的环戊二烯基配体,并利用这种配体合成了茂金属化合物MC。在自由基引发剂偶氮二异丁氰的存在下,通过茂金属化合物MC与苯乙烯、二乙烯基苯三者共聚而制备了非均相催化剂PS-DVB-MC ,并对制备过程中的各种产物进行了详细的表征和分析。采用0.5L高压不锈钢反应釜,对催化剂PS–DVB-MC催化乙烯均聚和乙烯/ l-己烯共聚合的动力学行为进行了研究,详细考察了催化剂浓度、反应温度、压力、Al/ Zr比、1-己烯浓度等因素对乙烯聚合反应的影响,得到如下主要结论:催化剂PS-DVB-MC具有催化乙烯均聚的高活性(1.053×107g PE / mo1 zr.hr),低Al / Zr比( 350:1 );具有良好的催化乙烯与α-烯烃(如1-己烯等)共聚的能力,在1-己烯浓度为0.080 mol / L时,催化活性达到最大(1.783×107 g PE / molZr.hr);乙烯均聚产物的分子量在18万左右,分子量分布窄( 2.19 )。对乙烯淤浆聚合的工艺参数进行了优化,这为下一步的中试实验和工业开发放大研究提供了重要的基础数据。总之,聚合物负载的茂金属催化剂PS-DVB- MC是一种具有单活性中心的烯烃聚合催化剂,具有良好的工业化前景

【Abstract】 Metallocene catalyst PS-DVB-MC on polymer support was prepared , then the catalyst was thoroughly characterized and analyzed in the convelltional methods , such as MS , FT- IR , NMR , SEM , XPS and 50 forth. Ethylene homo-olymerization and ethylene / l-hexene co-polymerization in sluny phase was investigated in the stainless steel reactor at high pressure of ethylene. the allyl substituted cyclopentadienyl ligand was synthesized in the method of phase transfer , then the metallocene compound MC was accordingly synthesized on the basis of the ligand . The heterogeneous catalyst PS-DVB-MC was prepared via co-polymerization of metallocene compound MC , styrene and divinyl-benzene in the presence of azodilsobutyronitrile ( AIBN ) , which was the initiator of free radical . Moreover , all variety of semi-roducts and products in the process of preparation were characterized and analyzed in detail. The kinetic behaviors of ethylene homo- olymerization and ethylene / l-hexene co-polymerization , catalyzed by the metallocene catalyst PS-DVB-MC in an 0.5 L stainless steel reactor , were studied. The effects of polymerization conditions on ethylene polymerization , such as concentration of catalyst , temperature of polymerization , pressure of ethylene , molar ratio of AI / Z r , etc . , were also investigated . Some leading results were as follows : the activity of the catalyst PS–DVB- MC for ethylene homo-polymerization was high ( 1.053 x 107 gPE / mol Zr·h ) , but the molar ratio of AI / Zr was low ( 350:1 ) ; the catalytic ability for ethyleneα-olefin ( such as l hexene etc . ) co-olymerization was great , and the corresponding activity come up to a maximum of 1.753 x 107 gPE / mol Zr·h while concenlration of l-hexene was 0.080 mol / L ; the molecular weight of polyethylene was about 180,000 , meanwhile the molecular weight distribution was narrow ( 2.19 ) ; the bulk density of polyethylene and ethylene / l-hexene co -polymer were 0.25 and 0.34 respectively . The teclmological parameters for ethylene polymerization in sluriy phase were optimized , 50 that the significant data of basic researches were available for the subsequent pilot plant and scale-up experiments in the near future . on balance , the metallocene catalyst PS-DVB-MC on polymer support 15 a kind of single-site type catalysts for olefin polymerization , and has a great industrial potential .

【关键词】 聚合物载体; 茂金属催化剂; 聚乙烯; 共聚
  新型全密度聚乙烯催化剂研究

摘要 4-5
Abstract 5
创新点摘要 6-9
前言 9-10
第一章 文献综述 10-20
    1.1 引言 10
    1.2 茂金属催化剂的分类 10-11
        1.2.1 非桥联茂金属催化剂 10-11
        1.2.2 桥联茂金属催化剂 11
        1.2.3 桥联杂原子半夹心结构茂金属催化剂 11
    1.3 茂金属烯烃聚合催化剂的负载 11-20
        1.3.1 无机载体 12-15
        1.3.2 有机/聚合物载体 15-20
第二章 催化剂制备试验 20-30
    2.1 试验部分 20-23
        2.1.1 试验原料 20
        2.1.2 催化剂制备 20-21
        2.1.3 催化剂分析和表征 21-23
    2.2 结果与讨论 23-30
        2.2.1 烯丙基环戊二烯的合成与表征 23-25
        2.2.2 茂金属化合物的合成与表征 25-27
        2.2.3 催化剂的合成与表征 27-30
第三章 催化剂乙烯浆液聚合研究 30-46
    3.1 乙烯淤浆聚合小试工艺装置的设计与建立 30-32
        3.1.1 反应釜压力的设计 30
        3.1.2 反应釜加热方式的设计 30
        3.1.3 反应釜冷却方式的设计 30-31
        3.1.4 反应釜搅拌方式的设计 31
        3.1.5 反应釜加料方式的设计 31
        3.1.6 反应装置图 31-32
    3.2 试验部分 32-33
        3.2.1 原料及处理 32
        3.2.2 乙烯聚合反应 32
        3.2.3 聚合物分析方法 32-33
    3.3 试验结果与讨论 33-46
        3.3.1 催化剂配比的研究 33-36
        3.3.2 催化剂评价试验 36-39
        3.3.3 聚乙烯产物的表征与分析 39-46
结论 46-47
参考文献 47-50
致谢 50-51
详细摘要 51-59

返回栏目页:化学工程论文

设为主页】【收藏论文】【保存论文】【打印论文】【回到顶部】【关闭此页