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Method for rapidly starting alpha-olefins polymerization in gas phase fluidized bed reactor

A technology of fluidized bed reactor and gas phase fluidized bed, which is applied in the field of rapid start-up of α-olefin polymerization reaction, can solve the problems of unfavorable energy saving and consumption reduction, reduce the production capacity of the device, prolong the start-up period of the device, and improve the market competitiveness , Reduce product cost and shorten the start-up cycle

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method takes a long time for dehydration, prolongs the start-up period of the device, consumes a large amount of ethylene, is not conducive to energy saving and consumption reduction, reduces the production capacity of the device, increases the production cost of the product, and affects the economic benefits of the enterprise.
In the prior art, no one has proposed a technical solution to this problem

Method used

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  • Method for rapidly starting alpha-olefins polymerization in gas phase fluidized bed reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0049] In the gas phase fluidized bed reactor, the chromium-based catalyst is used to produce high-density polyethylene copolymer products under the operating conditions. The density of the product is 0.950g / cm 3, The melt flow index is 11g / 10min (21.6kg). After the reactor is pressurized and replaced, the seed bed with the same density and index as the prepared product is installed, and the operation is as follows:

[0050] 1) Replace the system with ordinary nitrogen at a certain temperature and pressure. System water content is less than 10ppm.

[0051] 2) After ethylene is replaced until the water content of the system is less than 5ppm, triethylaluminum compound is added dropwise into the fluidized bed reactor.

[0052] 3) After the titration is completed, close the loop for about 3 hours. Chromium-based catalysts were cast to establish the reaction. It took 23 hours from nitrogen replacement to catalyst injection to establish the reaction.

Embodiment 2

[0054] In the gas-phase fluidized bed reactor, the metallocene catalyst is used to produce low-density polyethylene copolymer products under the operating conditions. The density of the product is 0.918g / cm 3 , the melt index is 2.0g / 10min (2.16kg). After the reactor is pressurized and replaced, the seed bed with the same density and index as the prepared product is installed, and the operation is as follows:

[0055] 1) Replace the system with ordinary nitrogen at a certain temperature and pressure. System water content is less than 20ppm.

[0056] 2) After ethylene is replaced until the water content of the system is less than 10 ppm, triethylaluminum compound is added dropwise into the fluidized bed reactor.

[0057] 3) After the titration is completed, close the loop for about 3 hours. Chromium cast catalyst to establish the reaction. It took 21 hours from nitrogen replacement to catalyst injection to establish the reaction.

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Abstract

The invention relates to a method for rapidly starting alpha-olefins polymerization in a gas phase fluidized bed reactor, which belongs to preparation of high molecular compound by a carbon-carbon unsaturated bond reaction, and particularly relates to the preparation method of ethylene homopolymer or ethene and alpha-olefins copolymer. The invention is characterized in that trace moisture in a seed bed of the gas phase fluidized bed reactor can be removed by an organic aluminum compound, the usage amount is the mass of the fluidized bed reactor seed bed multiplies by 1ppm-800ppm. The method of the invention comprises the following steps: a) nitrogen displacement, b) ethene displacement, c) the organic aluminum compound addition, d) catalyst input, material feeding by monomer, and normal production process. The method for rapidly starting alpha-olefins polymerization in the gas phase fluidized bed reactor is capable of rapidly removing the water content in the system, shortening the start-up period of the device, minimizing the consumption of the monomer, raising the production capacity of the product and the reducing the production cost of the product.

Description

technical field [0001] The present invention is a method for quickly starting alpha-olefin polymerization reaction in a gas-phase fluidized bed reactor. It belongs to the preparation of high molecular compounds prepared only by the reaction of carbon-carbon unsaturated bonds, and particularly relates to the preparation method of ethylene homopolymer or ethylene and α-olefin copolymer. Background technique [0002] At present, most of the homopolymerization or copolymerization of α-olefins is carried out in gas phase fluidized bed reactors, such as the production of ethylene copolymers. US Pat. No. 4,302,566 discloses a typical fluidized bed reactor for the production of ethylene homopolymerization and ethylene copolymers. In the gas phase fluidized bed polymerization reaction, the olefin polymer is formed on the surface of the catalyst particles, and the solid particles including the catalyst particles and the polymer are suspended in the fluidized bed region, that is, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F2/34
Inventor 王海平卢玉坤王常宝李玉成
Owner CHINA PETROLEUM & CHEM CORP
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