Gas phase polyethylene catalyst and preparation method thereof

A catalyst and polyethylene technology, applied in the application field of the catalyst in ethylene polymerization or copolymerization, can solve the problems of uneven shape of catalyst particles, harm to production personnel, increase energy consumption and material consumption, etc., to ensure long-term stable operation, The effect of reducing fine powder content and dosage

Active Publication Date: 2018-03-06
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent adopts one-step method to prepare LLDPE catalyst, although this catalyst system has high activity, hydrogen adjustment sensitivity, and the polyethylene product shape that makes is better, bulk density is higher; But the shortcoming of this catalyst is: (1) preparation The catalyst process needs to load titanium at a low temperature of <-5°C; (2) a large amount of titanium tetrachloride is required in the titanium loading process; (3) the shape of the catalyst particles is not uniform and the regularity is poor; (4) the catalyst preparation process A large amount of toluene is required for washing, etc.
This not only increases the energy and material consumption of the catalyst production process, but also pollutes the environment and brings harm to production personnel

Method used

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  • Gas phase polyethylene catalyst and preparation method thereof
  • Gas phase polyethylene catalyst and preparation method thereof
  • Gas phase polyethylene catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Catalyst preparation:

[0054] (1) Under the protection of high-purity nitrogen, 180 mL of n-heptane, 3.0 g of anhydrous magnesium chloride and 11.5 mL of n-butanol were sequentially added to a 1L reactor with a mechanical stirrer, and the temperature was raised to 85°C for 3 hours to obtain a Homogeneous solution A,

[0055] (2) Add 0.2 mol of orthosilicate electron donor to reactant A at 85°C, and react at this temperature for 1.0 hour to obtain reactant B;

[0056] (3) Lower the temperature of the above-mentioned reactant B solution to 60°C, and add 36 g of heat-activated SiO 955 to the reactant B. 2 , reacted for 5 hours to obtain reactant C;

[0057] (4) At 60°C, wash reactant C with n-hexane for 5 times to obtain reactant D, and finally dry it with high-purity nitrogen at 80°C to obtain white solid powder MgCl 2 / SiO 2 Composite carrier;

[0058] (5) Add the above reactant D into 100mL of n-heptane, then slowly add 8mL of titanium tetrachloride solution dropw...

Embodiment 2

[0064] Catalyst preparation:

[0065] (1) Under the protection of high-purity nitrogen, 120 mL of n-heptane, 3.0 g of anhydrous magnesium chloride and 15.0 mL of n-butanol were sequentially added to a 1L reactor with a mechanical stirrer, and the temperature was raised to 60°C for 5 hours to obtain a Homogeneous solution A,

[0066] (2) Add 0.01 moL of γ-isocyanatopropyltriethoxysilane electron donor to reactant A at 60°C, and react at this temperature for 2.0 hours to obtain reactant B;

[0067] (3) Lower the temperature of the above-mentioned reactant B solution to 70°C, add 15 g of heat-activated SiO 955 to the reactant B 2 , reacted for 4 hours to obtain reactant C;

[0068] (4) At 50°C, wash reactant C with n-hexane for 5 times to obtain reactant D, and finally dry it with high-purity nitrogen at 90°C to obtain white solid powder MgCl 2 / SiO 2 Composite carrier;

[0069] (5) Add the above reactant D into 100mL of n-heptane, then slowly add 10mL of titanium tetrachlor...

Embodiment 3

[0074] Catalyst preparation:

[0075] (1) Under the protection of high-purity nitrogen, 240 mL of n-heptane, 3.0 g of anhydrous magnesium chloride and 15.0 mL of n-butanol were sequentially added to a 1L reactor with a mechanical stirrer, and the temperature was raised to 70°C for 4 hours to obtain a Homogeneous solution A,

[0076] (2) At 70°C, add 0.2 mol of dipyrrolyldimethoxysilane and 0.3 mol of bisperhydroisoquinoline dimethoxysilane to reactant A, and react at this temperature for 1.5 hours to obtain the reactant B;

[0077] (3) Lower the temperature of the reactant B solution to 30°C, and add 30 g of heat-activated SiO 955 to the reactant B. 2 , reacted for 5 hours to obtain reactant C;

[0078] (4) Wash reactant C 5 times with n-hexane at 80°C to obtain reactant D, and finally dry it with high-purity nitrogen at 80°C to obtain white solid powder MgCl 2 / SiO 2 Composite carrier;

[0079] (5) Add the above reactant D into 150mL of n-heptane, then slowly add 10mL o...

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Abstract

The invention relates to a gas phase polyethylene catalyst and a preparation method thereof. In the catalyst, anhydrous magnesium chloride and porous silica gel serve as a composite carrier, titanium-containing transition metal loaded on the composite carrier serves as an active component, an electron donor compound is added in the preparation process to serve as a modifier, and the electron donoris a silane compound with asymmetry. The problems that the common catalyst has low cavity, poor copolymerization ability and high product fine component content are solved, different silane electrondonor compounds are added in the preparation of the catalyst, polyethylene resin with different melt indexes is produced, in particular the gas phase polyethylene catalyst can be used for producing anethylene/1-hexene copolymerization new product with high additional value, so that the performance of the product is improved, the processibility of the resin is improved, and the application field of the product is widened.

Description

technical field [0001] The invention relates to a method for preparing a catalyst suitable for gas-phase polyethylene, and the application of the catalyst in ethylene polymerization or copolymerization. Background technique [0002] The gas phase polyethylene process is one of the most widely used polyethylene production processes at present. It has the characteristics of short process flow, simple operation, no need for solvent recovery, low investment and wide product range. The progress of the gas phase polyethylene process has put forward higher requirements for the catalyst technology, not only requires the catalyst to have higher activity, but also to make the polyethylene have good particle shape, fluidity, and high bulk density, so that the gas phase can be fluidized The bed has a high density to increase the amount of single discharge, reduce the number of discharges, ensure the long-term stability of the operation of the device and reduce energy consumption. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/646C08F4/02C08F210/16
CPCC08F10/02C08F210/16C08F4/6465C08F4/02Y02P20/52
Inventor 任合刚王斯晗高宇新宋磊邹恩广姜进宪付义杨国兴王登飞韦德帅赵增辉何书艳张瑀健国海峰郭峰单大睿王立明孙全民
Owner PETROCHINA CO LTD
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