SMAO supported metallocene catalyst for slurry polymerization of ethylene

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Abstract In the field of olefin catalytic polymerization, metallocene catalysts show higher activity than traditional Ziegler-Natta catalysts. In this study, benzoic acid catalyzed the controlled hydrolysis of trimethylaluminum (TMA) to methylaluminoxane (MAO). The synthesized insoluble form of solid polymethylaluminoxane (sMAO) was used as a carrier to support the metallocene catalyst. The catalyst was employed for ethylene slurry polymerization and the role of reaction conditions on the catalytic behavior was systematically explored. The basic physical properties such as particle size, bulk density, molecular weight and distribution, melt flow rate of polyethylene were analyzed and characterized. The experimental results show that the prepared catalyst particles have good particle morphology and uniform particle distribution. The ethylene/1-hexene copolymerization activity may reach up to 15 302.6 g·g^-1 and a uniform medium- and high polyethylene density could be obtained when the slurry reaction is performed in a 5-litre reactor.

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	ZHANG Qian
	GE Tengjie
	JIANG Tao
	LI Jian

Keywords： solid polymethylaluminoxane metallocene catalyst ethylene slurry polymerization

Received 2021-08-13;

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ZHANG Qian, GE Tengjie, JIANG Tao, LI Jian.SMAO supported metallocene catalyst for slurry polymerization of ethylene[J] Chemcial Industry and Engineering, 2022,V39(6): 29-35

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