Solid MAO supported metallocene catalyst for slurry polymerization of ethylene

化学工业与工程

Chemcial Industry and Engineering

2024, Vol. 41

Issue (3) :56-67 DOI: 10.13353/j.issn.1004.9533.20220832

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Solid MAO supported metallocene catalyst for slurry polymerization of ethylene

WU Chaofan¹, ZANG Jinjin¹, WANG Lijuan², LI Jian¹

1. College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin 300457, China;
2. Daqing Chemical Research Center, Petrochemical Research Institute, China National Petroleum Corporation, Heilongjiang, Daqing 163714, China

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Abstract Methylaluminoxane (MAO) is the most commonly used activator for metallocenes in olefin polymerization reactions. In this research, an insoluble form of methylaluminoxane, also known as solid polymethylaluminoxane (sMAO), has been synthesized by the controlled hydrolysis of trimethylaluminum (TMA) with benzoic acid, followed by thermolysis. The role of preparing conditions (concentration of precursor, temperature of thermolysis, amount of hexane, et al.) on the particular morphology was systematically explored. SEM, ICP-MS and PSDA were used to characterize sMAO particles. sMAO can be utilized to support metallocene pre-catalysts in slurryphase ethylene polymerization reactions. Metallocene pre-catalyst rac-ethylenebis(1-indenyl)dichlorozirconium, rac-(EBI)ZrCl₂ were immobilized on sMAO samples, to afford solids which showed very high polymerization activities in hexane, comparable to those of the respective homogeneous catalysts formed by treatment of the pre-catalysts with MAO.

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Keywords： solid polymethylaluminoxane metallocene catalyst polyethylene slurry polymerization

Received 2022-11-08;

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WU Chaofan, ZANG Jinjin, WANG Lijuan, LI Jian.Solid MAO supported metallocene catalyst for slurry polymerization of ethylene[J] Chemcial Industry and Engineering, 2024,V41(3): 56-67

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