Ethene homopolymerization and copolymerization catalyst and preparation method thereof

A technology for ethylene polymerization and copolymerization, applied in the field of solid titanium catalysts, can solve the problems of low catalyst active components, poor catalyst activity, and difficulty in regulating particle size.

Inactive Publication Date: 2008-09-10
科莱恩催化剂(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned published patents, due to the low catalyst active components, after the catalyst is loaded on the carrier by impregnation and other methods, the catalyst activity is poor, which cannot meet the condensed state and super-condensed state operation of the existing polyethylene gas phase process.
In patent US 4376062 and patent CN 1493599A, on the basis of the above catalyst active components, fume-like silica is used as a filler, mixed with a matrix prepared from titanium compounds, magnesium compounds and electron donor compounds, and spray-dried The catalyst is obtained, and the loading capacity of the active components of the catalyst has been improved. The catalyst can be applied to the gas-phase fluidized bed condensed state and super-condensed state polymerization process of ethylene, but it is not suitable for combined processes that require high-activity catalysts. At the same time Its particle size is not easy to control
In addition, the catalyst preparation method has expensive equipment and low production efficiency.

Method used

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  • Ethene homopolymerization and copolymerization catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014]Example 1 4.76 grams (50 mmol) of anhydrous magnesium chloride, 90 milliliters of decane and 16.3 grams (125 mmol) of isooctyl alcohol were heated to 130° C. and allowed to react for 3 hours to obtain a homogeneous solution. To this solution was added 15 mmol of triethyl borate and stirred at 50° C. for 1 hour to dissolve triethyl borate in the solution. Add 10 grams of XPO2485 silica gel to the above solution, stir at 50°C for 1 hour, then cool the suspension obtained above to -10°C, then add 100 mL of titanium tetrachloride dropwise to the above solution within 1 hour while stirring in suspension. After completion of the dropwise addition, the temperature of the mixture was maintained at -10°C for 1 hour, then raised to 120°C over 3 hours with stirring, and maintained at this temperature for 2 hours. After 2 hours of reaction, the resulting solid was separated by hot filtration. The solid catalyst is fully washed with hexane and decane respectively until no precipita...

Embodiment 2

[0017] Example 2 4.76 grams (50 mmol) of anhydrous magnesium chloride, 90 milliliters of decane and 16.3 grams (125 mmol) of isooctyl alcohol were heated to 130° C. and allowed to react for 3 hours to obtain a homogeneous solution. Add 12 grams of XPO2485 silica gel to the above solution, stir at 50°C for 1 hour, then cool the suspension obtained above to -10°C, and then add 100 mL of titanium tetrachloride dropwise to the above solution within 1 hour while stirring. in suspension. After the dropwise completion, the temperature of the mixture was maintained at -10°C for 1 hour. Then 15 mmol of triethyl borate was added to the above mixture and stirred at -10°C for 1 hour to fully react the system. The temperature was then raised to 120°C over 3 hours with stirring and maintained at this temperature for 2 hours. After 2 hours of reaction, the resulting solid was separated by hot filtration. The solid catalyst is fully washed with hexane and decane respectively until no preci...

Embodiment 3

[0019] Example 3 4.76 grams (50 mmol) of anhydrous magnesium chloride, 90 milliliters of decane and 16.3 grams (125 mmol) of isooctyl alcohol were heated to 130° C. and allowed to react for 3 hours to obtain a homogeneous solution. To this solution, 7.5 mmol of triethyl borate was added and stirred at 50° C. for 1 hour to dissolve triethyl borate in the solution. Add 12 grams of XPO2485 silica gel to the above solution, stir at 50°C for 1 hour, then cool the suspension obtained above to -10°C, and then add 100 mL of titanium tetrachloride dropwise to the above solution within 1 hour while stirring. in suspension. After the dropwise completion, the temperature of the mixture was maintained at -10°C for 1 hour. Then 7.5 mmol of triethyl borate was added to the above mixture and stirred at -10°C for 1 hour to fully react the system. The temperature was then raised to 120°C over 3 hours with stirring and maintained at this temperature for 2 hours. After 2 hours of reaction, the...

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Abstract

The invention relates to a solid spherical titanium complex catalyst used in ethylene polymerization or copolymerization. The catalyst is prepared through the following steps: (1) the preparation of homogeneous magnesium solution is completed through dissolving magnesium halide in alcoholic compound; (2) at least one sort of inactive hydrogenous organic boron compound and an inorganic carrier are added in the homogeneous magnesium solution; and (3) the magnesium compound suspension reacts with titanium compound to generate the solid spherical catalyst through recrystallization. The catalyst, which has the advantages of higher catalytic activity, better hydrogen sensitivity, excellent catalyst particle morphology and narrow polymer particle diameter distribution, etc., is particularly suitable to be used in the multistrand polymerization process of ethylene requiring for catalyst with high-activity and excellent particle morphology as well as the gas-phase fluidized bed process.

Description

technical field [0001] The present invention relates to a solid titanium catalyst for ethylene polymerization and copolymerization. The solid titanium catalyst exhibits high catalytic activity when used in ethylene polymerization and copolymerization, and can produce polymers with high bulk density, narrow particle size distribution and less fine powder content. The catalyst of the present invention is very suitable for the combined polymerization process of ethylene requiring a catalyst with high activity and good particle shape, and the catalyst is also suitable for the gas phase fluidized bed process. technical background [0002] The gas-phase polymerization process of ethylene is the most typical Unipol gas-phase fluidized bed process, and the catalyst used is usually prepared by loading titanium and magnesium as active components on large-particle silica gel. The shape of the catalyst is completely determined by the shape of the silica gel carrier particles used, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/645C08F10/02
Inventor 郭琦姜勇
Owner 科莱恩催化剂(上海)有限公司
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