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Catalyst components for olefin polymerization and their preparation and use

A technology of olefin polymerization and catalyst, which is applied in the field of preparation of catalyst components, can solve the problems of unsuitable materials, narrow molecular weight distribution of polyolefins, etc., and achieve the effect of good shape, wide molecular weight distribution and good orientation ability

Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The first object of the present invention is to overcome the existing method for preparing catalyst components for olefin polymerization. When the obtained catalyst components are used for polymerization in the catalyst system, the molecular weight distribution of the prepared polyolefins is narrow, so that it is not suitable for Due to the shortcomings of being used as tube materials, a new preparation method for catalyst components for olefin polymerization is provided

Method used

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  • Catalyst components for olefin polymerization and their preparation and use
  • Catalyst components for olefin polymerization and their preparation and use
  • Catalyst components for olefin polymerization and their preparation and use

Examples

Experimental program
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Effect test

preparation example 1

[0121] Preparation of diethyl 2-cyano-2,3-diisopropylsuccinate: In a 1000 mL round bottom flask, add 48.1 g of sodium tert-butoxide and 300 mL of DMF. Heat to reflux. While stirring, 81.5 g of ethyl cyanoisovalerate were added dropwise. Heat up to 80°C and reflux for 2 hours. A mixed solution of 99.6 g of ethyl bromoisovalerate and 100 mL of DMF was added dropwise. Continue to heat up to 100°C for 20 hours. Stop the reaction, cool and filter. Filter cake washing. The filtrate was rotovapped to remove solvent. Add saturated ammonium chloride solution for washing and separate the layers. The organic phase was dried, filtered and spin-dried of solvent. Get crude products. Vacuum distillation yielded 94.2 g of the product (8 mbar, 123-127° C.). 1 H-NMR (CDCl 3 / TMS,300MHz)(δppm):0.99-1.04(m,8H), 1.08-1.38(m,10H), 2.12-2.16(m,1H), 2.28-2.37(m,1H), 2.97-3.02(m ,1H), 4.14-4.30(m,4H).

preparation example 2

[0123] Preparation of 2-cyano-2-n-pentyl-3-isopropyl diethyl succinate: using the method of Preparation Example 1, replacing ethyl cyanoisovalerate with ethyl cyano-n-heptanoate to obtain 2 -Diethyl cyano-2-n-pentyl-3-isopropylsuccinate was rectified under reduced pressure to obtain 53.7g of the product (8mbar, 145-148°C). 1 H NMR (CDCl 3 / TMS,300MHz)δ(ppm):0.85-0.91(t,3H),0.97-1.10(m,6H),1.21-1.37(t,6H,m,4H),1.56-1.64(m,2H), 1.73-1.82 (t, 2H), 2.15-2.22 (m, 1H), 2.81-2.83 (d, 1H), 4.14-4.30 (m, 4H).

Embodiment 1

[0126] (1) Preparation of Catalyst Component A1

[0127] (1) In the reactor that has been repeatedly replaced with high-purity nitrogen, add 3.150mol (300.0g) of anhydrous magnesium chloride, 19.68mol (2.1L) of toluene, and 8.4mol (1.1L) of 2-ethylhexanol in sequence , under the conditions of a stirring speed of 450rpm and a temperature of 110°C, the reaction was carried out for 3.0 hours to obtain a stable and uniform alcoholate solution;

[0128] (2) Add 3,5-heptanediol dibenzoate 48mmol (24ml), diisobutyl phthalate 336mmol (90ml) and tetrabutyl titanate 132mmol (45ml) to the above alcoholate solution , stirred for 60 minutes, cooled to room temperature to obtain a homogeneous solution; the above homogeneous solution was added to fully replaced by nitrogen, and equipped with 60mol (6.6L) of titanium tetrachloride and 11.4mol (1.2L) of toluene at -20°C In the reactor, they were fully contacted at -20°C by stirring. After 5 hours, the temperature was raised to 100°C. During t...

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Abstract

The invention relates to a preparation method of a catalyst component for olefin polymerization, the catalyst component obtained by the preparation method, and a catalyst system for olefin polymerization. In addition, the invention also relates to a polymerization method of polyolefin for pipes. The invention realizes the total quantity control and good distribution of titanium active ingredient in the catalyst component, also improves the use efficiency of cyano succinate compounds, so that the catalyst system prepared from the catalyst component can have high catalyst yield, and shows high polymerization activity and excellent dynamics performance in olefin polymerization during pipe material preparation. The prepared polymer has wide molecular weight distribution, and is suitable for production of an olefin polymer used as a pipe material.

Description

technical field [0001] The invention relates to a method for preparing a catalyst component for olefin polymerization, the catalyst component for olefin polymerization prepared by the method and its application. Background technique [0002] Currently, catalyst components based on magnesium, titanium and an electron donor, known in the art as Ziegler-Natta (Z-N) catalysts, are available for CH 2 =CHR Polymerization of olefins, especially in the polymerization of α-olefins with 3 carbon atoms or more, can give polymers with higher yield and higher stereoregularity. One of its preparation methods is to firstly prepare magnesium chloride into a uniform solution, and then crystallize and load active components containing titanium. In the dissolution and elution system, only with the presence of a precipitation aid can it be possible to obtain solids with uniform particle size. The precipitation aid generally uses organic acid anhydrides, organic acids, ketones, ethers, esters a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/654C08F4/651C08F4/649C08F4/645C08F10/06
Inventor 谭忠周奇龙徐秀东张锐宋维玮李凤奎于金华尹珊珊严立安
Owner CHINA PETROLEUM & CHEM CORP
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