Micro-interface enhanced reaction system and method for preparing polypropylene

Abstract

The invention provides a micro-interface enhanced reaction system for preparing polypropylene. The system is characterized by comprising a prepolymerization reactor and a polymerization reactor whichare connected in sequence, the prepolymerization reactor is provided with a prepolymerization micro-interface generator used for dispersing crushed materials into micro-bubbles, and the polymerizationreactor is provided with a micro-interface generator set used for dispersing the crushed materials into micro-bubbles; a polymerization reaction product outlet is formed in the bottom of the polymerization reactor and is connected with a flash tank for decomposing a catalyst in a polymer; a product outlet for discharging a polypropylene product is formed in the bottom of the flash tank. The micro-interface generator is arranged on the prepolymerization reactor, and meanwhile, the micro-interface generator unit is arranged on the polymerization reactor, so that the mass transfer area between agas-phase material and a liquid-phase material is increased, the reaction efficiency is improved, and the energy consumption is reduced; and moreover, the temperature and the pressure in the polymerization reactor are reduced, and the safety and the stability of the whole system are improved.

Description

technical field [0001] The invention relates to the technical field of preparing polypropylene, in particular to a micro-interface strengthening reaction system and method for preparing polypropylene. Background technique [0002] Polypropylene is a thermoplastic synthetic resin with excellent performance, which is a colorless and translucent thermoplastic lightweight general-purpose plastic. With chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high wear-resistant processing properties, etc., polypropylene has been rapidly used in machinery, automobiles, electronic appliances, construction, textiles, and packaging since its inception. It has been widely developed and applied in many fields such as agriculture, forestry, fishery and food industry. In recent years, with the rapid development of my country's packaging, electronics, automobile and other industries, it has greatly promoted the development of my country's ...

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Problems solved by technology

[0004] The slurry method usually uses a stirred bed reactor, tank reactor, tubular reactor, tower reactor, etc. as the polymerization reactor, but the phase boundary area and mass transfer coefficient provided by it are limited, and the gas utilization rate is low so that the reaction efficiency The reaction performance is relatively low, so it is difficult to obtain a breakthrough improvement in reaction performance, which in turn affects the overall efficiency of the reaction; in addition, there is a reaction peak in the early stage of propylene polymerization, with large heat release and severe heat release, and the internal temperature and pressure of the reactor are too high. It leads to high energy consumption and low reaction efficiency in the reaction process, and at the same time reduces the safety and stability of the entire system

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