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Washing process

A technology of process and washing medium, which is applied in the field of washing process, and can solve the problems of unobserved, damaged catalyst component particles, etc.

Pending Publication Date: 2021-07-23
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is expected that relatively severe separation processes such as hydrocyclone separation may somehow damage catalyst component particles (e.g. cause them to agglomerate or break up), but this has not been observed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0257] Preparation of ZN Catalysts by Emulsion Solidification

[0258] raw material

[0259] TiCl 4 (CAS 7550-45-90) was supplied by a commercial source.

[0260] 20% butyl ethyl magnesium (Mg(Bu)(Et)) in toluene supplied by Crompton

[0261] 2-Ethylhexanol supplied by Merck Chemicals

[0262] 3-Butoxy-2-propanol supplied by Sigma-Aldrich

[0263] Bis(2-ethylhexyl) citrate by Contract Chemicals

[0264] 1-254 by Evonik

[0265] Heptane, supplied by Chevron

[0266] Preparation of Mg complex

[0267] 3.4 liters of 2-ethylhexanol and 810 ml of propylene glycol butyl monoether (4 / 1 molar ratio) were added to the 20 l reactor. Then, 7.8 liters of a 20% solution of BEM (butylethylmagnesium) in toluene supplied by Crompton GmbH were slowly added to the well stirred alcohol mixture. During the addition, the temperature was kept at 10°C. After the addition, the temperature of the reaction mixture was raised to 60°C and mixing was continued at this temperature for 30 minute...

example 2

[0274] A hydrocyclone with a fractional particle size d50 of 13 μm was purchased from Krebs. Particles smaller than 13 μm enter the waste stream essentially from the top of the cyclone. Trials were carried out using a hydrocyclone connected to the catalyst preparation reactor unit 1 by connecting lines 4 and 5 . The catalyst was prepared according to the procedure described in Example 1.

[0275] The separation in the hydrocyclone is completed in less than 25 minutes.

[0276] refer to figure 1 , in hydrocyclone unit 3, the solid catalyst particles and liquid medium are separated by transferring the mixture from reactor 1 through a hydrocyclone. The bottoms stream was removed from the hydrocyclone and transferred to Reactor 2. The pressure difference between inlet and top was 0.7 bar.

[0277] When analyzed using a Malvern particle size analyzer, the sample showed a fractional particle size of about the desired 13 μm ( figure 2 ).

[0278]

[0279] Example 3 - Washi...

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Abstract

A process for washing a particulate substance comprising: (i)combining a particulate substance and a first washing medium in a first vessel to form a slurry and washing the particulate substance with said washing medium; (ii)transferring the slurry to a hydrocyclone; (iii)removing a first by-product stream depleted in particulate substance and a first product stream enriched in particulate substance from the hydrocyclone; (iv)transferring the first product stream to a second vessel and in the presence of a second washing medium forming a slurry and washing the particulate substance with said second washing medium e.g. by agitation thereof; (v)transferring the slurry to ahydrocyclone; (vi)removing a second by-product stream depleted in particulate substance and a second product stream enriched in particulate substance from the hydrocyclone.

Description

technical field [0001] The present invention relates to a novel process for washing particulate compositions, particularly particles of solid olefin polymerization catalyst components, using a hydrocyclone. In one embodiment, the present invention involves washing solid catalyst component particles in multiple washing steps using a hydrocyclone. In another embodiment, the present invention involves the use of a hydrocyclone to separate solid catalyst component particles from the medium in which they are prepared and from the washing medium in which these particles are then washed. The process of the present invention uses a "pendulum" separation procedure that uses hydrocyclones to speed up the separation process. Background technique [0002] The use of solid olefin polymerization catalysts to prepare polyolefins, such as polyethylene and polypropylene, is well known. Typically, these solid catalysts contain external supports. [0003] Supported Ziegler-Natta (ZN) cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/00B01J37/06B01D21/26B01J8/00B01J19/18
CPCC08F4/00B01D21/267B01J8/0055B01J19/1856B01J19/1862B01J2208/00787B01J2208/00867B01J2219/00051B01J2219/00189C08F4/643C08F10/00
Inventor 帕西·马蒂凯宁埃米莉亚·哈利文尤卡·佩卡·帕里亚宁
Owner BOREALIS AG
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