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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1

[0017] Preparation of solid catalyst components

[0018] Under the protection of nitrogen, the stirring is turned on, and 40 ml of decane, 7 g of magnesium chloride and 30 ml of isooctyl alcohol are sequentially added to the reaction kettle, and then the temperature is slowly raised to 130° C., and the reaction is kept constant for 2 hours. Then add 1.7 g of phthalic anhydride, continue constant temperature reaction for 2 hours, stop stirring, and naturally lower to room temperature for later use.

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

Example Embodiment

[0024] Example 2

[0025] The catalyst component was prepared by the same method as in Example 1, but when preparing the catalyst component, silica gel was added first, followed by the homogeneous solution of magnesium chloride. The added silica gel with an average particle size of 1.5 μm was changed from 3 mg to 1 mg. Ti (wt%) is 2.55%. Using this catalyst component, polymerization was carried out in the same manner as in Example 1. The results are shown in Table 1.

Example Embodiment

[0026] Example 3

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