Polymerization reactor and method for producing polypropylene by employing the same

Abstract

The invention relates to a polymerization reactor, which is in particular used for producing polypropylene, or used for producing propylene-ethylene random copolymer, propylene-butylene random copolymer or propylene-ethylene-butylene random terpolymer. The polymerization reactor comprises a vessel type reactor (1), a connecting pipe (2), a pressure lifting facility (3), a buffering vessel (15), a carburator (14), a propylene feeding control component (21) and a hydrogen feeding control component (23), the vessel type reactor is provided with a jacket (4), an agitator (5), a cooling water inlet opening (6), a cooling water outlet opening (7), a propylene filling opening (8) and a catalyst filling opening (9), and polymer generated by polyreaction is mixed with a non-polymerized monomer together to be discharged towards downstream through a discharge opening (10). The invention has the advantages that the detention period of the catalyst can tend to be homogeneous, and the particle diameter of the produced polypropylene particles tends to be consistent, etc.

Description

technical field [0001] The present invention relates to a polymerization reactor, especially for producing polypropylene, or for producing propylene-ethylene random copolymer, propylene-butene random copolymer or propylene-ethylene-butene ternary random copolymer thing. Background technique [0002] With the improvement of the performance of polyolefin plastics, the uses are becoming wider and wider. In particular, polypropylene is rich in raw materials and has a wide range of uses, which makes the technology of polypropylene develop rapidly. There are many polypropylene technologies in the world today, mainly divided into gas phase methods There are two kinds of polymerization techniques and liquid phase method, among which gas phase method has multiple polymerization techniques, and liquid phase also has multiple polymerization techniques. Each technique has advantages and disadvantages, but they share the disadvantage of uneven residence time of the catalyst in the reacto...

AI Technical Summary

Problems solved by technology

[0002] With the improvement of the performance of polyolefin plastics, the uses are becoming wider and wider, especially the rich raw materials of polypropylene and the wide range of uses, which makes the technology of polypropylene develop rapidly. There are many polypropylene technologies in the world today, mainly divided into gas phase method There are two kinds of polymerization techniques: gas-phase method and liquid-phase method. Each technology has advantages and disadvantages, but there is the disadvantage of uneven residence time of the catalyst in the reactor.

The present invention is based on the liquid-phase propylene polymerization technology. Compared with the loop reactor of liquid-phase propylene bulk polymerization (such as Basell's Spheripol polypropylene technology), it overcomes the disadvantages of relatively high equipment and large floor space when the loop reactor has a large production capacity. The residence time of the polypropylene catalyst in the reactor is different, resulting in uneven particle size of the polypropylene polymer, and the activity of some catalysts moves backward, which affects the product quality.

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