A kind of catalyst component and catalyst for propylene polymerization

A technology of propylene polymerization and catalyst, which is applied in the field of olefin polymerization catalysts, can solve the problems that other properties have not been studied in depth, and the molecular weight distribution of catalysts is not very satisfactory, etc., and achieve the effects of facilitating processing and application, easy control, and less fine powder content

Active Publication Date: 2011-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation method of the titanium-containing catalyst component disclosed in CN1931885A, a solid catalyst can be obtained without adding a precipitation aid. The patent only lists the activity of the catalyst for propylene polymerization in one example, and other properties have not been studied in depth
[0005] Chinese patent CN1718594A discloses a catalyst system for olefin polymerization or copolymerization, by further loading at least one surface modifier on the titanium / magnesium solid, thereby obtaining a titanium-containing solid catalyst component, this The particle shape, stereospecificity and impurity resistance of the catalyst are good, but the molecular weight distribution of the catalyst is not very satisfactory

Method used

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  • A kind of catalyst component and catalyst for propylene polymerization
  • A kind of catalyst component and catalyst for propylene polymerization
  • A kind of catalyst component and catalyst for propylene polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 (2, the preparation of 4-pentanediol dibenzoate)

[0031] 1. Preparation of 2,4-pentanediol

[0032] A mixture of 10g of 2,4-pentanedione and 30ml of methanol was added dropwise to a mixed solution of 2.5g of sodium borohydride, 0.1g of sodium hydroxide and 25ml of water at 0-10°C. After the addition, the solvent was removed under reduced pressure and extracted continuously with 40ml of ethyl acetate for 15h. The solvent was removed and column chromatography was used to obtain 2,4-pentanediol as a colorless liquid with a yield of 90%.

[0033] 2.2, Preparation of 4-pentanediol dibenzoate

[0034] Add 30ml tetrahydrofuran and 0.09mol pyridine to 0.03mol 2,4-pentanediol, add 0.075mol benzoyl chloride under stirring, and heat to reflux for 4h. After cooling, add 20ml of saturated brine, extract with ethyl acetate, anhydrous Na 2 SO 4 Dry and remove solvent. The colorless liquid 2,4-pentanediol dibenzoate was obtained by column chromatography or vacuum di...

Embodiment 2

[0036] Embodiment 2 (4-ethyl-3, the preparation of 5-heptanediol dibenzoate)

[0037] 1. Preparation of 4-ethyl-3,5-heptanedione

[0038] A mixture of 10.2 g of 3,5-heptanedione, ethyl iodide and 80 ml of THF was added in batches to 4.8 g of 50% sodium hydride oil under stirring. After the addition, the reaction was heated to reflux under stirring for 8h. Removal of the solvent yielded 4-ethyl-3,5-heptanedione.

[0039] 2. Preparation of 4-ethyl-3,5-heptanediol

[0040] A mixture of 14.6g of 3,5-heptanedione and 30ml of methanol was added dropwise to a mixed solution of 3.1g of sodium borohydride, 0.06g of sodium hydroxide and 25ml of water at 0-10°C. After the addition, the solvent was removed under reduced pressure and extracted continuously with 40ml of ethyl acetate for 15h. The solvent was removed to obtain the product with a yield of 90%. IR spectrum at 3400cm -1 There is a strong absorption peak at 1700cm -1 There are no absorption peaks on the left and right, wh...

Embodiment 3

[0045] 1. Preparation of Mg / Ti Solids

[0046] Add 6.5kg of magnesium chloride, 132.7L of toluene, 5.4L of epichlorohydrin, and 16.9L of tributyl phosphate into the reactor, and react for 2.5 hours at a stirring speed of 130rpm and a temperature of 60°C, and add 4.5mol 2, 4-Pentanediol dibenzoate, continue to react for 1.0h, cool down to -28°C, add 56L of titanium tetrachloride dropwise, gradually raise the temperature to 85°C, keep the temperature for 1.0h after reaching the temperature, filter off the mother liquor, and inertly dilute The solids containing magnesium / titanium were obtained after being washed several times with toluene and hexane and then dried.

[0047] 2. Preparation of solid titanium catalyst components

[0048] Add 1.4L ethanol and 96L toluene to the solid prepared above at -10°C, keep the temperature for 0.5h, slowly add 64L titanium tetrachloride, gradually raise the temperature to 110°C, add 2.0mol 2,4-pentanediol diol at 80°C Benzoic acid ester, 110°...

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PUM

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Abstract

The invention provides a catalyst for olefin polymerization, especially propylene polymerization. The titanium-containing catalyst component A selects a polyol ester compound with a special structure as a precipitation aid, and simultaneously uses a polyol ester compound or a binary The aromatic carboxylic acid ester compound is used as an electron donor, which saves the use of the traditional elution aid compound phthalic anhydride, eliminates the reaction step of dissolving the aid elution agent, reduces the complexity of catalyst component synthesis, and makes the catalyst preparation process more efficient. It is easy to control, and the obtained catalyst shows exciting polymerization activity and stereospecificity when used in propylene polymerization, and the polymer has less fine powder content and wider molecular weight distribution.

Description

technical field [0001] The invention relates to a catalyst for olefin polymerization, in particular to a catalyst for propylene polymerization and a method for preparing the solid component of the titanium-containing catalyst. Background technique [0002] As we all know, the granular catalyst with magnesium, titanium, halogen and electron donor as the basic components is firstly prepared into a uniform solution of magnesium chloride, and then precipitated by crystallization and loaded with titanium-containing active components. In the dissolution and elution system, only the presence of a precipitation aid can obtain solids with uniform particle size. The precipitation aid generally uses compounds such as organic acid anhydrides, organic acids, ketones, ethers, etc., as disclosed in patents such as CN85100997A and CN 1453298A The precipitation aid is an organic acid anhydride. Wherein the titanium-containing catalyst component is a homogeneous solution formed by dissolving...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/654C08F10/06
Inventor 谭忠郭正阳徐秀东严立安高明智刘海涛周凌李凤奎尹珊珊于金华王宇任春红王迎张玲马永华寇鹏杨岭刘萃莲宋维玮
Owner CHINA PETROLEUM & CHEM CORP
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