摘要
合成了邻苯基水杨醛亚胺钛配合物及其负载SiO2、MgCl2催化剂。红外光谱表征结果表明,该配合物是邻苯基水杨醛亚胺Schiff碱配体和钛的加合物。乙烯聚合结果表明,配体结构、配合物浓度、Al与Ti摩尔比对邻苯基水杨醛亚胺钛配合物的乙烯聚合活性和聚合物相对分子质量有较大影响,当配合物浓度为14.1μmol/L、Al与Ti摩尔比为1500时,配合物乙烯聚合活性和聚合物粘均相对分子质量分别达到7.2×105g/(mol.h)和5.27×105。以烷基铝氧烷作为助催化剂时,配合物的乙烯聚合性能优于普通烷基铝;以甲苯为反应介质时配合物具有较高的乙烯聚合活性。配合物负载SiO2、MgCl2后,催化活性、聚合物相对分子质量得到提高,聚合物熔点和形态得到明显改善。
An o-benzene salicylaldiminato titanium complex was synthesized, and the complex was supported on SiO2 or MgC12 to prepare catalyst for polyethylene（PE）production. FT-IR spectra results indicated that the obtained complex was a complex of o-benzene salicylaldiminato Schiff base ligand and titanium. The PE test results indicated that the structure of ligand, the concentration of complex and A1/Ti mole ratio had significant influence on catalyst activity and the PE molecule weight. Under the optimum conditions of a complex concentration of 14.1 μmol/L and an A1/Ti mole ratio of 1 500,the catalyst activity was 7. 2 × 10^5 g/（mol · h）with a PE molecule weight of 5. 27 × 10^5. The catalytic performance of ethylene polymerization over complex having methylaluminoxane as co-catalyst was better than that of having alkylaluminum as co-catalyst. The complex exhibited higher catalytic activity when using toluene as reaction media. The catalyst activity, PE molecule weight, PE melting point and morphology could be further improved by using immobilized catalyst, complex supported on SiO2 or MgCl2.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2007年第9期47-51,共5页
Petroleum Processing and Petrochemicals
基金
辽宁省教育厅高等学校科学研究计划项目(20012066
2004D073)
辽宁省科技攻关计划重大项目(200223001)
关键词
水杨醛亚胺
钛
催化剂
乙烯
聚合过程
催化活性
salicylaldiminato
titanium
catalyst
ethylene
polymerization process
catalyst activity
