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Preparation process of catalyst for propylene polymerization

A technology of propylene polymerization and catalyst, which is applied in the field of preparation of Ziegler-Natta catalysts for propylene polymerization, which can solve the problems of fragility, poor particle size distribution and strength of catalyst particles, etc., and achieve the effect that is beneficial to industrial production

Inactive Publication Date: 2006-11-15
北京燕化高新催化剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the shortcomings of the catalyst particle size distribution in the prior art, which is relatively wide, poor in strength, and easily broken, resulting in too much fine powder content when used for propylene polymerization, which affects the operation of the device; it can also simplify the catalyst preparation process and reduce the The type of raw materials is required and the cost is reduced. The present invention provides a method for preparing a Ziegler-Natta catalyst that has a simple preparation process, requires few types of raw materials, and can achieve the purpose of controlling the morphology and particle size distribution of propylene polymers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of solid catalyst components

[0018] Under the protection of nitrogen, the stirring was started, and 40ml of decane, 7g of magnesium chloride and 30ml of isooctyl alcohol were successively added into the reactor, and then the temperature was slowly raised to 130°C, and the reaction was carried out at constant temperature for 2 hours. Then add 1.7 g of phthalic anhydride, continue the constant temperature reaction for 2 hours, stop stirring, and let it cool down to room temperature naturally for later use.

[0019] Add 200ml of titanium tetrachloride into the catalyst synthesis kettle fully replaced with nitrogen, lower the temperature to -22°C, drop the prepared magnesium chloride homogeneous solution at room temperature into it within 1 hour, and keep The temperature in the kettle is -22±1°C. After the dropwise addition is completed, add 3mg of silica gel with an average particle size of 1.5μm, keep the temperature for 1 hour, and slowly raise the temperat...

Embodiment 2

[0025] Catalyst components were prepared in the same manner as in Example 1, but when preparing the catalyst components, silica gel was added first, followed by magnesium chloride homogeneous solution, and the average particle diameter added was 1.5 μm of silica gel changed from 3 mg to 1 mg. Ti (weight %) is 2.55%. Polymerization was carried out in the same manner as in Example 1 using this catalyst component. The results are listed in Table 1.

Embodiment 3

[0027] Prepare the catalyst component with the same method as in Example 1, but when preparing the catalyst component, the silica gel with an average particle diameter of 1.5 μm added is changed from 3 mg to 4 mg, and polycarboxylate diisobutyl phthalate is changed to Di-n-butyl phthalate. Ti (weight %) is 2.86%. Polymerization was carried out in the same manner as in Example 1 using this catalyst component. The results are listed in Table 1.

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Abstract

A process for preparing a Ziegler-Natta catalyst used for the sludge, bulk and gas-phase polymerization of propene features that in its preparing procedure, the small solid particles as special treater are added for controlling the growth of catalyst particles, so controlling the form and size of propene polymer.

Description

technical field [0001] The invention relates to a preparation method of a catalyst that can be used in propylene slurry, bulk and gas phase polymerization processes, in particular to a preparation method of a Ziegler-Natta catalyst for propylene polymerization. Background technique [0002] The preparation of Ziegler-Natta high-efficiency supported catalysts generally uses magnesium chloride as a carrier to support transition metal compounds. The most critical is the carrier preparation process, because the carrier not only plays the role of loading and dispersing the active center, but also acts as a special component with the active center, so that the catalyst has high activity. Moreover, through the reproducibility of the carrier-catalyst-polymer, the carrier also controls many important indicators such as the particle shape, particle size distribution and apparent density of the polymer. In the early days, the magnesium chloride carrier was prepared by grinding method,...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/646
Inventor 石勤智张新军张文平赵青郑建坡胡建东陈东黄庆军朱亚卿
Owner 北京燕化高新催化剂有限公司
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