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Catalyst for ethylene slurry polymerization and application thereof

A slurry polymerization and catalyst technology, applied in the field of ethylene slurry polymerization catalysts, can solve the problem of insufficient hydrogen sensitivity

Active Publication Date: 2018-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the catalyst is simple, and it shows high activity when used in ethylene polymerization. At the same time, the particle shape of the obtained polymer is good, and the apparent density is high, but the sensitivity of the catalyst to hydrogen is not good enough.

Method used

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  • Catalyst for ethylene slurry polymerization and application thereof
  • Catalyst for ethylene slurry polymerization and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of catalyst component (A): after high-purity N 2 In the fully replaced reactor, add 4.0g of anhydrous MgCl successively 2 , 50mL toluene, 2.0mL epichlorohydrin, 3.0mL tributyl phosphate, heat up to 50°C with stirring, and maintain it for 15 minutes, add 6.0mL ethanol, continue the reaction for 15 minutes, and cool the solution to -5~0°C , then drop 30mL titanium tetrachloride into the above magnesium chloride homogeneous solution, then add 5ml tetraethoxy silicon, raise the temperature of the solution to 80°C, and remove the mother liquor. Washed 4 times with hexane and dried in vacuum to obtain solid catalyst component A.

[0037] Ethylene polymerization 1: After the stainless steel tank with a volume of 2 liters was fully replaced by H2, 1000 mL of hexane was added therein, and the solid catalyst component A prepared above contained 0.5 mmol Ti and 1.0 mmol of triethylaluminum were measured. Add 1,2-dichloroethane to make the molar ratio of catalyst ...

Embodiment 2

[0040] Catalyst component (A) is the same as in Example 1, except that 1,2-dichloroethane is added in polymerization 1 and 2 and the molar ratio of Ti in the catalyst is changed to 1.0.

Embodiment 3

[0042] Catalyst component (A) is the same as in Example 1, except that 1,2-dichloroethane is added in polymerization 1 and 2 and the molar ratio of Ti in the catalyst is changed to 2.0.

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Abstract

The invention relates to a carrier catalyst used for ethylene slurry polymerization, catalyst composition and a preparation method thereof. The catalyst is composed of a component A, a component B and a component C. The component A is characterized in that magnesium halide is dissolved in an organic epoxy compound, an organic phosphorous compound and an electron donor compound to form an uniform solution, TiCl4 is slowly reacted with the magnesium halide uniform solution under low temperature, catalyst crystal is precipitated, a heating reaction is strictly controlled to obtain the catalyst component A; the component B is an organic aluminum compound, the component C is a halogenated hydrocarbon compound, the component C provides two usage modes, 1) the component C and the component B are mixed, then a mixture is added in an ethylene polymerization system, and 2) the component A, the component B and the component C are respectively added while polymerization is carried out. The catalyst has good mechanical property for ethylene slurry polymerization to obtain polyethylene, and the polymerization activity of the catalyst can be increased.

Description

technical field [0001] The invention relates to a catalyst for olefin polymerization, especially ethylene slurry polymerization, as well as a preparation method and application of the catalyst. Background technique [0002] The traditional Z-N catalyst starts from the classic titanium-aluminum catalyst, and has been developed to the stage of activation by compounds such as magnesium chloride and modification of various other organic compounds; and from simply improving the catalytic activity of the catalyst to improving the polymer by adjusting the catalyst Product performance. [0003] Since the 1970s, companies such as Mitsui Petrochemical Industry Co., Ltd. of Japan have successfully developed a variety of Ti-Mg high-efficiency carrier catalysts with magnesium chloride as the carrier, which has enabled the rapid development of the world's slurry production of polyolefin industry. [0004] In the method of ethylene polymerization and copolymerization disclosed in Japanese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F4/646C08F4/654C08F4/656
Inventor 孙怡菁马冬周俊领郭子芳黄廷杰王丽莎
Owner CHINA PETROLEUM & CHEM CORP