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Reaction system for preparing stress whitening resistant polypropylene and method for preparing polypropylene in system

A reaction system and polypropylene technology, applied in the field of polymer chemical industry, can solve the problems of product rigidity reduction, achieve the effect of increasing polymerization time, high catalytic activity, and reducing the occurrence of stress lines

Inactive Publication Date: 2017-05-17
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In actual production, many downstream application companies improve the stress whitening resistance of PP by mixing 5-15% PE, but this will lead to a significant decrease in product rigidity

Method used

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  • Reaction system for preparing stress whitening resistant polypropylene and method for preparing polypropylene in system
  • Reaction system for preparing stress whitening resistant polypropylene and method for preparing polypropylene in system
  • Reaction system for preparing stress whitening resistant polypropylene and method for preparing polypropylene in system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Liquid phase stirred reactor + gas phase fluidized bed flash reactor + gas phase fluidized bed reactor + gas phase fluidized bed reactor, connected in series, the volumes are 0.175 cubic meters, 1 cubic meter, 1.1 cubic meters, 1.1 cubic meters, The reaction temperatures are 70°C, 80°C, 70°C, 70°C respectively, the average residence time is about 0.6 hour, 0.8 hour, 1.0 hour, 1.0 hour respectively, the total polymerization amount is 25-30kg / h, continuous polymerization. Among them, the first two reactors are for homopolymerization of propylene, the third reactor is for ethylene propylene copolymerization, the fourth reactor is for ethylene self-polymerization, and a gas-solid separation facility is added between the third and fourth reactors to ensure The powder particles that enter the fourth reactor do not carry propylene monomer as much as possible to ensure that what is carried out in the fourth reactor is ethylene self-polymerization, the third reactor ethylene / (eth...

Embodiment 2

[0044] Repeat Example 1, but the third reactor ethylene / (ethylene+propylene)=32% mol, hydrogen / ethylene=0.05% mol, the fourth reactor ethylene / (ethylene+propylene)≥94% mol (considering particle interior part of propylene that is difficult to replace), hydrogen / ethylene = 0.1% mol.

Embodiment 3

[0046] Repeat Example 1, but the third reactor ethylene / (ethylene+propylene)=45% mol, hydrogen / ethylene=0.05% mol, the fourth reactor ethylene / (ethylene+propylene)≥94% mol (considering particle interior part of propylene that is difficult to replace), hydrogen / ethylene = 0.1% mol.

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Abstract

The invention discloses a reaction system for preparing stress whitening resistant polypropylene and a method for preparing polypropylene by employing the system. A liquid-phase stirring reactor is sequentially connected with a gas-phase fluidized bed flashing reactor and at least two gas-phase fluidized bed reactors which are connected in series. According to the method, polypropylene granules are sequentially subjected to propylene liquid-phase homopolymerization, propylene gas-phase homopolymerization, propylene ethylene gas-phase copolymerization and ethylene gas-phase spontaneous polymerization through the reaction system and a Ziegler-Natta catalytic system, and pass a gas-solid drying and separating system and are discharged, so that the stress whitening resistant polypropylene is obtained. The system has the advantages that a copolymerization reactor is additionally arranged at the stage of gas-phase polymerization, a flow of propylene liquid-phase homopolymerization, propylene gas-phase homopolymerization, propylene ethylene gas-phase copolymerization and ethylene gas-phase spontaneous polymerization is formed, a notable characteristic is reflected in the stage of gas-phase polymerization, polymer granules are subjected to three polymerization stages including propylene homopolymerization, propylene ethylene copolymerization and ethylene spontaneous polymerization, and the interface integration of different structural molecules is properly improved, so that the stress whitening resistant polypropylene has relatively good mechanical property and processing property, and the reaction system further has outstanding characteristics that the occurrence probability of stress cracking is reduced, and the stress whitening phenomenon of products is obviously improved.

Description

technical field [0001] The invention belongs to the field of polymer chemical industry, and in particular relates to a reaction system for preparing stress-whitening-resistant polypropylene and a method for preparing polypropylene by using the system. Background technique [0002] After more than 30 years of rapid development, the production process of polypropylene has been quite mature and reliable. At present, the widely used PP production process in the world mainly includes Lyondellbasell's Spheripol ring pipe process, BASF's Novelen process, Ineos process, and Mitsui's Hypol process. kind. Among them, Spheripol and Ineos processes have accelerated technological innovation in recent years and account for a relatively high proportion. The former has accounted for about 40% of the world's total PP. Many other production processes are based on the changes or extensions of the above several processes. [0003] In terms of product and process adaptability, the Spheripol lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F2/01
Inventor 徐宏彬笪文忠刘克福杨柳梅利杭卫军刘克柴子斌
Owner SINOPEC YANGZI PETROCHEM
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