Catalyst for ethylene polymerization or copolymerization and its preparing method

A technology for ethylene polymerization and copolymerization, which is applied in the field of catalysts for ethylene polymerization or copolymerization and its preparation. It can solve the problems of unsatisfactory particle shape of the catalyst and achieve good particle shape, narrow particle distribution, and high catalytic activity. Effect

Inactive Publication Date: 2004-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of catalysis used during chemical reactions called polyethers (PE) allows for better control over molecular structure and properties such as crystal growth rates and sizes. By adding certain elements like aluminum oxynitride powder into this reaction system, it becomes more effective at controllably producing special types of plastic materials that have improved physical characteristics compared to existing products made by other methods. Additionally, due to their low costs, they make them easier to dispose after use without causing environmental concerns. Overall these technical benefits improve efficiency and reduce production costs while maintaining desired quality product qualities.

Problems solved by technology

The technical problem addressed in this patents relates to finding a more stable and easier way to make catalyst materials while maintaining their excellent performance at commercial scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Synthesis of catalyst

[0038] In the reactor fully replaced by high-purity nitrogen, 2.4g of magnesium dichloride was added in turn, 40ml of toluene, 3.9ml of epichlorohydrin and 4.1ml of tributyl phosphate treated with molecular sieves were added, and the temperature was raised to 80°C under stirring. After 2 hours, the solids were completely dissolved to form a homogeneous solution. 0.56 ml of ethanol was added, and the reaction was carried out at 80°C for 1 hour. Add 30 ml of dehydrated hexane, 2.3 g of silica gel (activated at 600 ° C, and then activated by 0.7 mmol of triethylaluminum), cool the system to -25 ° C, slowly add 8 ml of titanium tetrachloride dropwise, and then slowly The temperature was raised to 80°C, and the reaction was carried out for 2 hours. Stop stirring and let stand, the suspension is quickly stratified, the supernatant is removed, washed with hexane four times, and dried with high-purity nitrogen to obtain a solid catalyst with good f...

Embodiment 2

[0042] (1) The synthesis of the catalyst is the same as that in Example 1.

[0043] (2) Ethylene polymerization

[0044] A stainless steel reaction kettle with a volume of 2 L was fully replaced by high-purity nitrogen, 1 L of hexane and 1.0 ml of triethyl aluminum with a concentration of 1 M were added, and 15 mg of the catalyst prepared above was accurately weighed with a syringe, and the temperature was raised to 75 ° C. Hydrogen was used to make the pressure in the kettle reach 0.48Mpa, then ethylene was introduced to make the total pressure in the kettle reach 1.03Mpa (gauge pressure), and the polymerization was carried out at 85°C for 2 hours.

Embodiment 3

[0046] (1) The synthesis of the catalyst is the same as that in Example 1.

[0047] (2) Ethylene polymerization

[0048] A stainless steel reaction kettle with a volume of 2 L was fully replaced by high-purity nitrogen, 1 L of hexane and 1.0 ml of triethyl aluminum with a concentration of 1 M were added, and 15 mg of the catalyst prepared above was accurately weighed with a syringe, and the temperature was raised to 75 ° C. Hydrogen was used to make the pressure in the kettle reach 0.68Mpa, then ethylene was introduced to make the total pressure in the kettle reach 1.03Mpa (gauge pressure), and the polymerization was carried out at 85°C for 2 hours.

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Abstract

The present invention provides a kind of composite carrier catalyst for the polymerization and copolymerization of ethylene and its preparation process. The catalyst is prepared through dissolving magnesium halide in organic epoxy compound, organic phosphoric compound and inert diluent; treating the magnesium halide solution with alcohol compound; and separation via adding great specific surface area inert carrier in the presence of alkane liberation assistant and adding the halide of transition metal titanium for co-separation. The catalyst is used in the polymerization and copolymerization of ethylene and exhibits high catalytic activity, good hydrogen regulating sensitivity, excellent granular shape and less polymer produced.

Description

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Claims

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Application Information

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Owner CHINA PETROLEUM & CHEM CORP
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