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Method for avoiding agglomeration of continuous gas phase polymerization

A technology of polymerization reaction and gas phase polymerization, applied in the field of olefin polymerization, can solve the problems of polymer agglomeration, reduction of comonomer content, and unsatisfactory effect.

Inactive Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When this type of reactor produces random copolymers of propylene / ethylene, propylene / butene-1 or propylene / ethylene / butene-1, because the catalyst is concentrated in the early stage of the reaction, the heat release of the polymerization reaction is relatively large, and it is easy to form Agglomeration of polymers due to polymerization
The aggregates formed by these polymerizations will continue to grow in the subsequent process, and eventually form large pieces or form filaments and ribbons under the action of stirring, which will affect the stable operation of the device and the quality of the product.
Although some measures have been taken in the industrial process, such as increasing the pre-polymerization link, reducing the concentration of the catalyst, reducing the comonomer content, etc., the results are not satisfactory.
Especially when producing random copolymers with high comonomer content, the phenomenon of polymer agglomeration has not been solved

Method used

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  • Method for avoiding agglomeration of continuous gas phase polymerization
  • Method for avoiding agglomeration of continuous gas phase polymerization
  • Method for avoiding agglomeration of continuous gas phase polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Carry out the random copolymerization of propylene / ethylene / butene-1 in the device shown in accompanying drawing, catalyst active component is prepared by the embodiment 1 that CN98111780.5 describes, cocatalyst is triethylaluminum, and external electron donor is Diisobutyldimethoxysilane. The pressure of the polymerization reactor was controlled at 2.3MPa, and the temperature was controlled at 66°C. Nitrogen containing 4.5% oxygen was added to the gas phase feed in the area where the catalyst feed position of the reactor was located, and the concentration of oxygen in the gas phase feed was controlled to be 5 ppmV. Adjust the feed amount of propylene and butene-1 according to the composition set by the process target to achieve the structure of the target polymer. The data of the particle size distribution of the obtained polymer powder is shown in Table 1, and other analytical data are shown in Table 2.

Embodiment 2

[0023] Same as Example 1, but no oxygen is added to the gas phase feed of the reactor, and the oxygen content measured by the online water oxygen analyzer is less than 0.5ppm. Hexane containing 2 wt% water was added to the liquid-phase sprayed propylene feed in the catalyst feed zone of the reactor, and the water content measured by the online water analyzer was 6 ppm.

[0024] The data such as size distribution and composition, melting point of the obtained polymer of analysis test are listed in Table 1 and Table 2 respectively.

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Abstract

The invention provides a method for avoiding the agglomeration of a continuous gas phase polymerization. In the method, an activity inhibitor is added in an initial stage of the continuous gas phase polymerization so as to avoid local agglomeration caused by the relative concentration of a catalyst in the initial stage of the reaction and the relatively high thermal discharge of the polymerization reaction. The method is particularly suitable for producing random copolymers of propylene / ethane, propylene / butylene or propylene / ethane / butylenes in a horizontal gas-phase reactor.

Description

technical field [0001] The present invention relates to a method for avoiding agglomeration in gas phase polymerization. Gas phase polymerization refers to the gas phase polymerization of propylene or ethylene, especially the random copolymerization of propylene / ethylene, propylene / butene-1 or propylene / ethylene / butene-1, which belongs to the field of olefin polymerization. technical background [0002] Olefin gas phase polymerization does not involve the recovery of monomers or solvents, the process is simple, the economic indicators of investment and operation are low, and it is suitable for the production of copolymers soluble in liquid phase monomers or solvents, so it is used in polyethylene, polypropylene Wide range of industry applications. Especially the horizontal gas phase polymerization reactor is well applied in the polypropylene industry. It is characterized in that the reactor is placed horizontally, and there is an agitator that runs through the head and tai...

Claims

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Application Information

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IPC IPC(8): C08F2/34
Inventor 宋文波杨芝超刘旸陈江波仝钦宇杜亚锋
Owner CHINA PETROLEUM & CHEM CORP
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