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Continuous polymerization process for liquid-phase propylene bulk polymerization

A liquid-phase propylene and bulk polymerization technology, which is applied in the field of olefin polymerization, can solve the problems of non-application, energy consumption, and insufficient reactors, etc.

Active Publication Date: 2011-01-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a large amount of internally circulated propylene undoubtedly brings a lot of energy consumption, which affects the economics of the device
Furthermore, propylene polymerization in liquid phase tubular reactors has not been applied
[0005] The plug-flow reactors used for propylene polymerization in the prior art are all used in the gas-phase bulk polymerization process, and the way of removing the polymerization heat also affects the economical efficiency of the device, so this kind of reactor still has shortcomings

Method used

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  • Continuous polymerization process for liquid-phase propylene bulk polymerization
  • Continuous polymerization process for liquid-phase propylene bulk polymerization
  • Continuous polymerization process for liquid-phase propylene bulk polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The titanium-containing solid catalyst component is obtained by the method described in the patent Chinese patent CN93102795. Its Ti content: 2.4wt%, Mg content: 18.0wt%, di-n-butyl phthalate content: 13wt%, organoaluminum compound using three Ethyl aluminum, and the external electron donor is methylcyclohexyldimethoxysilane.

[0022] The polymerization reaction is carried out on a set of polypropylene pilot plant adopting the present invention, which includes a prepolymerization reactor and two tubular reactors connected in series, without a gas phase reactor, see appendix figure 1 . Titanium-containing solid catalyst components, organic aluminum compounds, and external electron donors are continuously added to the prepolymerization reactor for prepolymerization. After prepolymerization, the catalyst enters the first series tubular reactor to produce homopolymer products. Wherein, the volume of the prepolymerization reactor is 5L, the prepolymerization temperature is ...

Embodiment 2

[0026] Use the same titanium-containing solid catalyst component, organoaluminum compound and external electron donor compound as in Example 1, only use a tubular reactor, and add a small amount of ethylene monomer in the reactor simultaneously, by adjusting the addition of ethylene to Control the ethylene content in the polymer powder to be 2.5% by weight. The relevant test results are shown in Table 1.

Embodiment 3

[0028] Use the same titanium-containing solid catalyst component, organoaluminum compound and external electron donor compound as in Example 1, and use two tubular reactors and a gas-phase fluidized bed reactor simultaneously, see appendix figure 2 . The flow of triethylaluminum into the prepolymerization reactor was increased to 1.2 g / hr, and the homopolymerization was carried out in the tubular reactor, so there was no other feed in the tubular reactor except propylene and hydrogen. Control the hydrogen concentration in the first tubular reactor to 2000ppm, and control the hydrogen concentration in the second tubular reactor to 2000ppm. In the fluidized bed reactor, in addition to supplementing propylene monomer, part of ethylene monomer is also supplemented, and the ethylene content in the product is controlled to be 12% by adjusting the composition of ethylene in the gas phase in the fluidized bed reactor.

[0029]

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PUM

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Abstract

The invention relates to a method used for olefin polymerization by using a plurality of serial polymerization reactors, which is characterized by comprising the following steps of: in the presence of catalysts, adding propylene into the reactors, and discharging generated polymers from outlets of the reactors. In the method, the generated polymer particles pass through reaction regions in a flow mode of piston flow; and at the outlets of the reactors, the generated polymers are all discharged, and back mixing in any mode cannot be generated. The used reactors are vertically arranged pipe reactors, and the flow mode of the fluid in the reactors is laminar flow. In one or more serially operated polymerization reactors, the first reactor is a prepolymerization reactor, the catalysts, aluminum alkyl, external electron donors and a small amount of hydrogen are added into the first prepolymerization reactor, the obtained prepolymer is added into a second reactor, and the generated polymer slurry is discharged from the outlets of the reactors.

Description

technical field [0001] The invention belongs to the field of olefin polymerization, and relates to a continuous polymerization process of liquid phase propylene bulk polymerization using a plurality of series polymerization reactors. Background technique [0002] In olefin polymerization production, plug flow reactors usually have some unique advantages compared to fully mixed reactors. This is because in the plug flow reactor, the catalyst and the polymer have a consistent residence time, so that the polymer product produced not only has a uniform composition among particles, but also has a narrow particle size distribution, that is, the difference between particles is very small. Small, such products are more excellent in performance. In addition, the plug flow reactor has a short transition time and less transition material when switching grades. [0003] At present, the olefin polymerization process using a plug flow reactor includes the Innovene process of Ineos (form...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F2/02C08F4/645C08F4/649C08F210/06C08F2/01
Inventor 陈江波宋文波于鲁强杨芝超仝钦宇杜亚锋
Owner CHINA PETROLEUM & CHEM CORP
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