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Process for producing high performance polypropylene

A production method and technology of polypropylene, which is applied in the field of production of high-performance polypropylene, can solve the problems of few types of products, poor performance parameters of melted products, and narrow molecular weight distribution.

Active Publication Date: 2016-10-26
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the molecular weight distribution of polypropylene products in the prior art is relatively narrow, the product types are few and the performance parameters of melted products are poor, and a new method for producing high-performance polypropylene is provided.

Method used

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  • Process for producing high performance polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention is carried out on a set of continuously operating two parallel tank type liquid phase reactors and two gas phase fluidized bed reactors connected in series, and the product performance testing method is the same as that of the prior art.

[0025] The main catalyst in Catalyst Ⅰ is the NG polypropylene high-efficiency main catalyst jointly developed by Sinopec Beijing Research Institute of Chemical Industry and Sinopec Catalyst Branch. The X-ray spectrum has a diffraction peak when 2θ is 15°, and there is no diffraction when 2θ is 35°. peak, which is replaced by a "halo" of maximum intensity from 28° to 36°. The main catalyst in Catalyst II is HDC polypropylene high-efficiency main catalyst jointly developed by Sinopec Beijing Research Institute of Chemical Industry and Sinopec Catalyst Branch. The X-ray spectrum has no diffraction peaks when 2θ is 14.95° and 35°, while 2θ ranges from 30 to A "halo" of maximum intensity occurs between 36°.

[0026] The fee...

Embodiment 2

[0032] Same as implementation example 1, product performance testing method is the same as implementation example 1. The difference is that the production capacity of the device has been expanded by 100%.

[0033] Performance parameters of the final product:

[0034] Test items

Embodiment 3

[0036] According to the method and steps of Example 1, the polymerization temperature of the first tank-type liquid phase reactor was 190° C., the reaction pressure was 9.0 MPaG, and the amount of the active component of the main catalyst was 0.122 kg / h. The polymerization temperature of the second tank-type liquid phase reactor was 180° C., the reaction pressure was 8.5 MPaG, and the amount of the active component of the main catalyst was 0.101 kg / h.

[0037] The first gas-phase fluidized bed reactor has a polymerization temperature of 180°C and a reaction pressure of 8.0MPaG. In the second gas-phase fluidized bed reactor, the polymerization temperature is 190° C., and the reaction pressure is 9.0 MPaG.

[0038] Performance parameters of the final product:

[0039] Test items

[0040] Charpy impact strength (-20°C)

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Abstract

The present invention relates to a method for producing high performance polypropylene. A purpose of the present invention is to mainly solve problems of narrow molecular weight distribution, less product type and poor melting product performance parameter index of the polypropylene product in the prior art. The technical scheme of the method comprises that: (1) propylene and hydrogen are divided into at least four parts, and the first part of the propylene and the hydrogen enters a first liquid phase reactor and contacts a catalyst I to produce a stream I; (2) the second part of the propylene and the hydrogen enters a second liquid phase reactor and contacts a catalyst II to produce a stream II; (3) the stream I and the stream II are mixed to obtain a mixture, the mixture and the third part of the propylene and the hydrogen enter a first gas phase polymerization reactor, and the reaction product of the first gas phase polymerization reactor and the fourth part of the propylene and the hydrogen enter a second gas phase polymerization reactor to carry out a reaction so as to obtain the polypropylene product. With the technical scheme, the problems in the prior art are well solved. The method can be used for production of polypropylene.

Description

technical field [0001] The present invention relates to a method for producing high performance polypropylene. Background technique [0002] The high molecular weight part of the polymer with a wide molecular weight distribution makes the polymer product have higher mechanical properties, and the low molecular weight part makes the polymer product have better processing performance. Polypropylene with a wide molecular weight distribution has been widely used at present, mainly including Lyondellbasell in the Netherlands, INEOS in Luxembourg, JPP in Japan, and Dow Chemical in the United States have developed and researched. [0003] At present, the preparation of polypropylene with wide molecular weight distribution mainly adopts the method of staged polymerization, which integrates the advantages of bulk propylene polymerization process and gas phase polymerization process. Firstly, high molecular weight polypropylene is prepared, and then low molecular weight polypropylene ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F2/00C08F4/649C08F4/646C08F4/643C08F4/44
Inventor 陈永强徐怡何琨
Owner SINOPEC SHANGHAI ENG