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Production and reactor for polypropylene

A technology of preparation process and reaction device, which is applied in the field of polypropylene preparation process and its reaction device, can solve the problems of low grade and poor quality of products, achieve quick results, improve low-temperature brittleness, and improve quality

Active Publication Date: 2006-08-16
南京金陵塑胶化工有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a polypropylene preparation process and its reaction device to solve the low-grade and poor-quality products that exist in the preparation of polypropylene by the existing intermittent liquid-phase bulk polymerization process due to high low-temperature brittleness. It is only suitable for the manufacture of general plastic products. The low-temperature brittleness of polypropylene produced by the new process has been greatly improved, and the notched or unnotched impact strength has been greatly improved. Due to the improved performance, it is beneficial to increase product varieties.

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Embodiment Construction

[0011] The present invention is further described in conjunction with the accompanying drawings and examples. The preparation process of the present invention includes homopolymerization, copolymerization and flashing treatment in sequence. The homopolymerization uses propylene as the main ingredient, with a trace amount of hydrogen, triethylaluminum activator, Auxiliary catalyst DDS, CS-I, CS-II catalysts are used as auxiliary materials. The auxiliary materials are carried out in the polymerization kettle 1 with propylene in a certain order. The materials used are based on one ton of polypropylene products. Base aluminum activator 0.55-0.65kg, CS-I, CS-II catalyst 0.04-0.05kg, auxiliary catalyst DDS 0.05-0.06kg, the reaction temperature is controlled at 70-80°C, the reaction pressure is controlled at 3.55-3.65Mpa, in When the homopolymerization reaction takes 70-80 minutes, open the circulating fan in the external circulation system of the polymerization kettle to feed ethylen...

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Abstract

Production of polypropylene and its reactor are disclosed. The process is carried out by propylene homopolymerization reacting for some time in polymerizer, and inducing ethane gas from external-circulation system into polymerizer to have copolymerization reaction. The external-circulation system consists of steam heat exchanger, circulation fan and related pipeling sluice valve. It costs low, has better impact strength and quality, more variety and can improve low-temperature brittleness. It can be used for small and moderate intermittent polypropylene producer.

Description

Technical field: [0001] The invention relates to a polypropylene preparation process and a reaction device thereof, belonging to the technical field of polypropylene preparation in petrochemical industry Background technique: [0002] Polypropylene is a widely used industrial raw material for plastic products. The quality of polypropylene directly affects the quality and application range of plastic products. [0003] At present, the current situation of my country's polypropylene industry is: there are many small-scale production devices of various types, but few devices with large production capacity; there are many devices for producing general materials, and few devices for producing special materials. Among them, the large-scale polypropylene production equipment is mainly based on imported technology, and the medium-sized and small-scale polypropylene production equipment is mainly based on self-developed technology. [0004] From the perspective of my country's polyp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/52
Inventor 孙诚王继锋陈杰辛宝山马志国王金霞吴义卢建飞张建英蒋山尊房翠成国栋
Owner 南京金陵塑胶化工有限公司
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