Gas phase fluidized bed process LLDPE catalyst, preparation and application thereof

A gas-phase fluidized bed and catalyst technology, which is applied in the field of gas-phase fluidized bed method LLDPE catalyst and its preparation and application, can solve the problems of unfavorable production equipment running smoothly, poor copolymerization ability, easy to generate static electricity, etc.

Active Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned dry powder catalyst method, all have to undergo alkylaluminum reduction treatment, and when using this type of catalyst to produce linear low density polyethylene with a high melt index, there is a high content of fine powder, and the polymer is prone to static electricity in the reactor, forming Sheeti...

Method used

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  • Gas phase fluidized bed process LLDPE catalyst, preparation and application thereof
  • Gas phase fluidized bed process LLDPE catalyst, preparation and application thereof
  • Gas phase fluidized bed process LLDPE catalyst, preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Catalyst preparation:

[0028] (1) Under the protection of high-purity nitrogen, 1.6 L of n-decane, 80.0 g of anhydrous magnesium chloride and 331 mL of isooctyl alcohol were sequentially added to a 5 L reactor with a mechanical stirrer, and the temperature was raised to 130 ° C for 3 h to obtain a Homogeneous solution A.

[0029] (2) Cool the above-mentioned reactant A solution to 90°C, add 89ml (0.25moL) tetrabutoxysilane, and react for 1 hour to obtain reactant B,

[0030] (3) At 90°C, add 400 g of heat-activated SiO 955 to reactant B 2 , reacted for 5h to obtain reactant C,

[0031] (4) Cool the reactant C obtained above to -7°C, and add 500 mL of TiCl dropwise within 2 hours 4into reactant C, and kept at this temperature for 0.5 hours, then slowly raised the temperature to 110°C for 2 hours, and removed the upper liquid by suction filtration to obtain reactant D,

[0032] (5) At 100°C, wash the reactant D2 times with toluene, then wash the reactant D7 times wit...

Embodiment 15

[0053] The preparation method of the catalyst is the same as that in Example 2. In the gas-phase polymerization evaluation method of ethylene, except that the molar ratio of hydrogen to ethylene is changed, the others are the same as in Example 1. The molar ratio of hydrogen to ethylene here is 0.28, and the gas-phase polymerization of ethylene results in See Table 3.

Embodiment 16

[0055] The preparation method of the catalyst is the same as that in Example 2. In the gas-phase polymerization evaluation method of ethylene, except that the molar ratio of hydrogen to ethylene is changed, the others are the same as in Example 1. The molar ratio of hydrogen to ethylene here is 0.38, and the gas-phase polymerization of ethylene results in See Table 3.

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Abstract

The invention relates to a catalyst for preparation of LLDPE by a gas phase fluidized bed process, preparation and application thereof. The catalyst takes porous silica gel and anhydrous magnesium chloride as the carrier, adopts a titanium-containing transition metal loaded on the porous silica gel-magnesium chloride composite carrier as active components, and employs an electron donor compound as a modifier. In terms of the total mass of the catalyst, the load components include: 1.00-5.00% of Ti, 15.20-32.35% of Cl, 1.35-6.52% of Mg, 0.10-5.78% of the electron donor, and the balance silica gel. The catalyst is used for a gas phase polyethylene process, solves the problems of low activity, poor copolymerization ability and high product ash content in general catalysts, and can be used for production of polyethylene resin with different melt indexes, especially for production of ethylene/1-hexene copolymerization new products with high added value, thereby enhancing the product performance, improving the processability of resin, and broadening the application fields of the products.

Description

technical field [0001] The present invention relates to a catalyst for preparing LLDPE by gas-phase fluidized bed method and its preparation method, and the application of the catalyst in ethylene gas-phase polymerization or copolymerization, especially in ethylene gas-phase fluidized-bed polymerization condensed state or super-condensed state polymerization application. Background technique [0002] The gas-phase polyethylene process is an advanced polyethylene production process. There are many sets of equipment in the world that use the gas-phase process to produce polyethylene. At present, the titanium-based Ziegler-Natta catalyst is the main catalyst for the production of polyethylene, and the linear low-density polyethylene produced by the catalyst has good processability and mechanical properties. The catalyst suitable for the gas phase fluidized bed polyethylene process should have good fluidity and certain mechanical strength, and its shape should be spherical or q...

Claims

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Application Information

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IPC IPC(8): C08F4/646C08F2/34C08F4/649C08F210/02
Inventor 任合刚王斯晗邹恩广张瑞任鹤赵成才高宇新付义王登飞张大伟王立娟赵增辉何书艳张瑀健马丽刘洋杨国兴赵兴龙郭峰李瑞国海峰王世华
Owner PETROCHINA CO LTD
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