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Linear polyethylene catalyst, preparation method and application thereof

A linear polyethylene and catalyst technology, applied in the field of linear polyethylene catalyst and its preparation, can solve the problems of shortening the residence time and affecting the catalytic efficiency of the catalyst, and achieve the effects of improving product quality, ensuring long-term stable operation and accelerating the reaction rate

Inactive Publication Date: 2010-06-23
北京凯华创新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Due to the current popularization and application of the operation of the reactor in the condensed or super-condensed state in China, the production efficiency of the reactor has been improved, which means that the residence time of the catalyst in the reactor is shortened, which greatly affects the catalytic efficiency of the catalyst.

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  • Linear polyethylene catalyst, preparation method and application thereof

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preparation example Construction

[0025] In the following, the present invention will be further understood through the detailed description of specific embodiments of the preparation method of the linear polyethylene catalyst of the present invention.

[0026] The preparation method of linear polyethylene catalyst of the present invention comprises the following steps:

[0027] (1). Under the protection of refined nitrogen, add 1500L of dehydrated isopentane to the mother liquor tank, and add magnesium dichloride (MgCl 2 ) 30.0Kg, then add polycarbonate alcohol 250L, fully stir and mix, and set aside.

[0028] (2). Add 170Kg of silica gel to the silica gel activation furnace, feed nitrogen into the bottom to make it fluidized, heat it to 600°C, remove free water and some hydroxyl groups, keep it for 4 hours, and cool down to obtain activated silica gel.

[0029] (3). Mix the mixed solution prepared in step (1) with the activated silica gel obtained in step (2), stir thoroughly, then raise the temperature to ...

specific Embodiment approach

[0037] In a gas-phase fluidized bed with a diameter of 3m and a height of 12m, after nitrogen and ethylene are replaced by conventional methods, the pressure is 2300Kpa, the temperature is 88°C, Al / Ti is 30-50, and hydrogen is the molecular regulator. See Table 1 for other polymerization conditions. Continuously inject catalyst of the present invention, ethylene and comonomer butene-1 accordingly, catalyst injection rate is 1.0KgCAT / h, polyethylene output is 8500Kg / h, continuous operation 72h, the catalytic efficiency of reactant weighing calculation catalyst, Calculate the particle size (Wt%) distribution of the product after sieving with a standard sieve, its catalyst activity (catalytic efficiency) is 8500KgPE / KgCAT, and the bulk density of polyethylene resin is 320~350Kg / m 3 . Other characteristics of polyethylene resin: melt index (MI), density (DE), melt flow ratio (MFR), and particle size distribution are shown in Table 1.

[0038] Table 1: Catalyst prepared by the pr...

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Abstract

The present invention relates to one kind of catalyst for preparing linear polyethylene and its preparation process and application. The preparation process includes the following steps: 1. adding magnesium dichloride and alcohol into isopentane through stirring in nitrogen environment to obtain a mixture; and 2. mixing the mixture and activated silica gel and adding alkyl aluminum after the alcohol content is lowered; adding titanium tetrachloride and tetrahydrofuran; soaking the catalyst substrate; adding alkyl aluminum to activate and drying to obtain the catalyst. The catalyst is applied in polymerization or copolymerization of ethylene monomer, and has high catalytic activity, and capacity of resulting in smooth polymerization reaction and raising polymer quality.

Description

technical field [0001] The invention relates to a linear polyethylene catalyst and its preparation method and application, in particular to a linear polyethylene catalyst suitable for a gas-phase fluidized bed and its preparation method. Background technique [0002] At present, the catalysts commonly used in the domestic production of polyethylene (PE) are Ziegler-Natta's Ti series or Gr series. In the production of gas-phase fluidized bed polyethylene catalysts, in order to ensure the long-term stable operation of the reactor, the catalyst is required to have relatively High reactivity to reduce production costs and improve resin product performance, but also requires fluidized resin to have a higher bulk density. [0003] It is known that a domestic production enterprise in Jilin Province produces a linear polyethylene catalyst for a gas-phase fluidized bed, and its preparation method is as follows: [0004] (1) Silica gel activation [0005] Add 170Kg of silica gel int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F4/645C08F2/34
CPCY02P20/52
Inventor 张广斌陈文生
Owner 北京凯华创新科技有限公司