Catalyst component for ethylene polymerization and catalyst thereof

An ethylene polymerization and catalyst technology, applied in the field of solid catalyst components and their preparation, can solve the problems of high production cost, large amount of fine powder, complicated operation, etc., and achieve the effects of stable operation, uniform feeding and uniform feeding.

Inactive Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned published patents, in order to make the catalyst applicable to the gas-phase fluidized bed polymerization process, there are relatively strict requirements on the average particle size, surface area, and pore size of the carrier-silicon dioxide used, and the price of this carrier material More expensive, and the silica carrier needs to be strictly activated before use, all of which lead to an increase in the production cost of the catalyst
And because the active components of the catalyst are loaded on the carrier by impregnation and other methods, the catalyst efficiency is not satisfactory due to the limitation of the amount of titanium loaded.
In addition, the amount of fine powder in the polyethylene powder produced by using this catalyst is relatively large, usually the particles below 150 microns account for about 15wt% of the whole powder, which is very undesirable in industrial production
[0004] The catalyst production method mentioned in the Chinese patent CN 1085915A, although overcomes some shortcomings mentioned above, needs to use metal magnesium as a reducing agent in the production process, and still needs to use a large amount of silica carrier substances, and f

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of catalyst components

[0035] Add 4.8 grams of magnesium chloride, 93 milliliters of toluene, 4.0 milliliters of epichlorohydrin, and 12.5 milliliters of tributyl phosphate into the reaction kettle, and react for two hours at a stirring speed of 450 rpm and a temperature of 60°C, and add 1.4 grams of o-benzene Diformic anhydride, continue to react for one hour, lower the temperature to -28°C, add 56 ml of titanium tetrachloride dropwise, gradually raise the temperature to 85°C, keep the temperature for one hour, filter off the mother liquor, pass through the inert diluent toluene and organic solvent hexane several times After washing and drying, a magnesium / titanium-containing solid A is obtained.

[0036] Add 6 grams of solid A to another reaction kettle, add 120ml of hexane, add 2.5ml of AlEt dropwise under the condition of stirring at 320rpm and the temperature at 0°C 2 A mixture of Cl and 1mlTHF, where AlEt 2 The concentration of Cl was 14wt%. Und...

Embodiment 2

[0041] Catalyst preparation method is the same as embodiment 1.

[0042] Polymerization evaluation conditions: a stainless steel reaction kettle with a volume of 2 liters, fully replaced by hydrogen gas, injecting about 0.5 liters of hexane with nitrogen, injecting 2 ml of triethylaluminum-hexane solution with a concentration of 1 mmol / ml with a syringe, and stirring Then add a certain amount of catalyst component C, make up the total amount of hexane is about 1 liter.

[0043] After the feeding is completed, the temperature is raised and hydrogen and ethylene are introduced successively, 6.8×10 5 Pa Hydrogen, 3.5×10 5 Pa ethylene, the polymerization temperature is 85°C, react for two hours, lower the temperature, drain the residual pressure in the kettle, release the polymer slurry material, filter off the hexane, dry the polymer to obtain polyethylene powder, the results are shown in Table 1.

Embodiment 3

[0045] Add 6 grams of solid A to another reaction kettle, add 120ml of hexane, add 2ml of THF dropwise under the conditions of stirring at 320rpm and temperature at 0°C, and react halfway under the conditions of stirring at 320rpm and temperature at 10°C Hours, the solid was washed with 120 mL of hexane. Add 120ml of hexane, add 2ml of AlEt dropwise under the conditions of stirring at 320rpm and temperature at 0°C 2 Cl, where AlEt 2 The concentration of Cl was 14wt%. Under the condition of stirring speed of 320rpm and temperature of 10°C, the reaction was carried out for half an hour, and the solid matter was washed with 120ml of hexane. After evaporating and drying, 6.72 g of granular solid component C was obtained, which contained 1.88% (weight) of Ti and 20.3% (weight) of tetrahydrofuran.

[0046] Polymerization evaluation conditions are the same as in Example 1, and the results are shown in Table 1.

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Abstract

The invention provides a solid catalyst component for ethylene polymerization or copolymerization, which does not adopt silica gel and the like as carriers, but uses a solid containing magnesium and titanium as the carrier component and loads a certain quantity of a titanium compound, an electron donor and an activator, and the catalyst component has the advantages of relatively narrow particle size distribution, high activity of the catalyst and obtainment of a polymer with low content of fine powder, thereby being applicable to slurry polymerization or vapor phase polymerization of ethylene, in particular to the polymerization process of a vapor phase fluidized bed of the ethylene which feeds the catalyst in the slurry form.

Description

technical field [0001] The invention relates to a solid catalyst component for ethylene polymerization or copolymerization, a preparation method thereof, and a catalyst containing the solid catalyst component. technical background [0002] In the polymerization of olefins, especially the polymerization of ethylene or the copolymerization of ethylene and α-olefins, catalyst components based on magnesium, titanium, halogen and electron donors are mostly used. When this type of catalyst is used in a gas-phase fluidized bed polymerization process, in order to ensure that the shape and particle size distribution of the catalyst particles are more suitable for the operation in a fluidized state, the above-mentioned catalyst components are usually supported on a carrier such as silica gel. For example: the catalysts disclosed in US4,302,565, US4,379,759 and CN 1064870A for gas-phase fluidized bed reactions are impregnated with matrix components prepared from titanium compounds, mag...

Claims

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Application Information

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IPC IPC(8): C08F4/654C08F10/02C08F210/16C08F2/34C08F2/14
Inventor 杨岭寇鹏周俊领王洪涛马永华张玲李秉毅王丽莎王迎
Owner CHINA PETROLEUM & CHEM CORP
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