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Polymerization catalyst system, methods of making and uses therefor

A catalyst and system technology, applied in the field of polymerization catalyst system and its preparation and use, can solve the problems of rough catalyst system particles, catalyst system surface area reduction, alumina cracking, etc.

Inactive Publication Date: 2007-07-18
CHEVRON PHILLIPS CHEMICAL CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the catalyst system uses a silica-based inorganic oxide support, heating may cause the silica to melt or sinter, thereby reducing the surface area of ​​the resulting catalyst system
If alumina is chosen as the support material, heating the alumina can lead to cracking of the alumina, resulting in inhomogeneous and coarse particles of the catalyst system, which can result in difficult-to-handle polymer products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Test 101: 10-15 g of 964 Magnapore was prepared by firing at a rate of about 6°C / min to a holding temperature of 593°C and holding at this temperature for about 3 hours.  , Lot 2633 (purchased from W.R. Grace of Balumore, Md) activation. Air flow is 1.2-1.6 SCFH at ambient temperature. After cooling, the system was flushed with nitrogen to remove all traces of air. The catalyst was stored under nitrogen until use. This catalyst was used as a control, called 964 Magnapore  .

[0060] Experiment 102: Make 1025g (4.0mol) Mg(NO 3 ) 2 ·6H 2 O and 13.3gCr(NO 3 ) 3 9H 2 O was dissolved in 400ml deionized water. Spray this warm slurry on 800g 964 Magnapore  (Lot 2633), then spray 670ml concentrated NH 4 Oh. Divide the mixture into 2 equal portions, each containing 135ml concentrated NH 4 OH in 2.6 liters of deionized water for 1 hour at about 50-60°C. The solids were filtered off and then slurried in 2.6 liters of water at about 50-60°C for 30 minutes. Repeat...

Embodiment 2

[0066] This example illustrates other examples of surface area enhancement using the AESOP method described in Example 1. Name 952, HA30W, HPVSiO 2 and XPO-7003 are different silicas produced by Davison Catalyst Division of W.R. Grace Co. of Baltimore, Md.

[0067] Table 2

[0068] test

Embodiment 3

[0070] This example demonstrates the improvement in catalyst system support and catalyst system surface area resulting from the cogelation of silica and magnesium compounds to form the support for the catalyst system.

[0071] Test 301: Make 64g Mg(NO 3 ) 2 ·6H 2 O was dissolved in 150 ml of deionized water, to which 2 ml of concentrated HNO was added 3 . With continuous stirring, 149 ml of tetraethoxysilane (Strem, 98%, density = 0.9356 g / cc) was added over a period of 45 minutes. To this mixture was added dropwise a solution containing 100ml of water and 10ml of concentrated NH 4 OH solution. Some white precipitates formed during the addition of alkali. Add 37ml dilute NH 4 After OH, the mixture gelled. Make the gel in 2 liters containing 25ml concentrated NH 4 Aging in OH water at 80°C for about 1 hour, then filtering, washing twice at 80°C for about 30 minutes, each time using 2 liters containing 5ml concentrated NH 4 OH water. The gel was then washed twice with...

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PUM

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Abstract

A novel magnesium treated silica-containing compound that is useful as a support for chromium based olefin polymerization catalyst systems is provided which produces ethylene polymers having with MWD's that promote good properties particularly in HMW film applications.

Description

technical field [0001] The present invention relates to a polymerization catalyst system and a polymerization method. Background technique [0002] The preparation of olefin polymers by the hydrocarbon solution or slurry process using supported chromia catalyst systems has long yielded products of excellent properties in many respects. As supports for chromia catalyst systems, a wide variety of supports have been disclosed in the art, including silica, alumina, boria, zirconia, silica-alumina, and other refractory metals. To obtain polymer products with easy processability, the catalyst system preferably has low pore volume and high surface area. Catalyst systems with low pore volume and high surface area are generally believed to result in higher melt indices, resulting in more processable olefin polymers. However, it has also been found that reducing the pore volume of the catalyst system generally corresponds to reducing the surface area of ​​the catalyst system. These...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J31/38B01J31/18B01J31/32B01J31/14B01J31/34C08F4/616C08F4/22B01J21/08B01J21/10C08F4/02C08F4/50C08F4/58C08F4/654C08F4/658C08F10/00C08F110/02C08F210/16
CPCC08F10/00B01J21/10B01J21/08C08F210/16Y02P20/52C08F4/025C08F4/69C08F4/24C08F210/14C08F2500/12C08F2500/04C08F2500/26B01J21/14
Inventor J·史威玛M·P·麦克丹尼尔S·J·马丁K·S·克林斯E·A·本哈姆A·P·伊顿A·M·苏克哈迪亚
Owner CHEVRON PHILLIPS CHEMICAL CO LP