Research on polypropylene washing-deashing process

化学工业与工程

Chemcial Industry and Engineering

2023, Vol. 40

Issue (4) :122-128 DOI: 10.13353/j.issn.1004.9533.20210806

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Research on polypropylene washing-deashing process

YE Xinxin¹, XING Zhaoliang², JIANG Tao¹, LI Jian¹

1. College of Chemical Engineering and Materials Science, Tianjin University of Science&Technology, Tianjin 300457, China;
2. State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co., Ltd. ), Beijing 102200, China

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Abstract Removing the ash and improving the purity of polypropylene resin are important to extend its application in the fields of electronic and electrical membrane parts, medical and health products, food safety appliances. In this research, we designed a system of "n-hexane+isopropanol" to wash and remove the ash in the polypropylene powder to reduce the content of catalyst residual elements such as Ti, Mg, Al, etc., thereby obtaining high-purity polypropylene. The effect of process conditions such as detergent type, washing temperature, detergent ratio, washing time and detergent dosage on the ash removal effect was systematically studied, and the performance change of polypropylene resin after washing and deashing treatment was explored. The experimental results show that the total ash content is reduced to 30.81 μg·g^-1, the ash removal rate reaches 79.99%, and the polypropylene purity is significantly improved by using the "n-hexane+isopropanol" composite detergent to wash the polypropylene powder. At the same time, washing and deashing treatments improve the isotacticity of polypropylene.

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	YE Xinxin
	XING Zhaoliang
	JIANG Tao
	LI Jian

Keywords： polypropylene solvent washing ash

Received 2021-08-25;

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YE Xinxin, XING Zhaoliang, JIANG Tao, LI Jian.Research on polypropylene washing-deashing process[J] Chemcial Industry and Engineering, 2023,V40(4): 122-128

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