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Catalyst precursor particles, their preparation and use

A catalyst and precursor technology, applied in the field of silicon oxide particles and its preparation, can solve complex smoke treatment equipment, toxic smoke, harmful and other problems, and achieve the effect of eliminating processing defects

Active Publication Date: 2010-11-24
英国埃科维斯特催化剂技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In addition, many chromium and / or aluminum compounds used in the prior art, especially organometallic compounds, generate harmful or toxic fumes during the activation or calcination of catalyst precursors to form activated catalysts
Sites where catalyst precursor activation takes place require sophisticated fume handling equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1 (comparative - organometallic from heptane - homopolymerization - 700°C)

[0076] 100 g of silica xerogel support (pure silica) was prepared by evaporative drying of the hydrosol. The surface area and pore volume of the support were determined by nitrogen porosimetry as described above using a Micromeritics ASAP 2420 analyzer and were 381 m 2 / g and 1.76cm 3 / g.

[0077] Using the Malvern Mastersizer TM The particle size distribution of the carrier particles was determined as follows: d 90 169.3 μm, d 50 is 114.6μm, and d 10 is 63.4 μm. (d 90 90% by weight of the particles have a particle size smaller than d 90 The particle size-equivalent definition applies to d 50 and d 10 ).

[0078] 100 g of silica xerogel support (previously dried at 140° C.) was added to a dry reaction flask equipped with a stirrer. will be 600cm 3 Add heptane to the flask to form a silica / heptane slurry. Add 6.78 g of chromium acetylacetonate to another clean and dry flask...

Embodiment 2

[0080] Embodiment 2 (according to the present invention-homopolymerization-700 ℃)

[0081] A methanolic solution of chromium acetate and aluminum acetate was prepared by adding 1.15 g of chromium acetate and 2.84 g of boric acid stabilized basic aluminum acetate to a beaker equipped with a magnetic stirrer.

[0082] Add about 50cm 3 methanol, and the mixture was stirred for 1 hour to completely dissolve the chromium and aluminum salts. This chrome-aluminum solution was added to 30 g of the dried silica xerogel support used in Example 1, thereby impregnating chromium and aluminum onto the support. Methanol was removed from the resulting catalyst precursor by drying in a vacuum oven at 140° C. for 3 hours. A blue / green catalyst precursor powder was obtained, and the contents of chromium and aluminum were 0.93% by weight and 1.87% by weight, respectively, based on the elements. The boron content was determined to be 1720 ppm by weight. The surface area and pore volume were de...

Embodiment 3

[0085] Example 3 (comparison-impregnating aluminum after impregnating chromium first-homopolymerization-700°C)

[0086] By using 2201cm 3 The aqueous solution of chromium acetate was prepared by diluting the chromium acetate solution containing 7.68 weight% of chromium with the water. This solution was added to 1500 g of the silica xerogel described in Example 1. After dehydration, a fluffy catalyst with a chromium content of 0.97% by weight was obtained. The surface area and pore volume are 380 m 2 / g and 1.62cm 3 / g (ASAP 2420).

[0087] 70 g of this chromium-containing silicon oxide was previously dried at 140° C. for 4 hours, and placed in a closed flask. add 250cm 3 of heptane. Under a nitrogen purge, add 43 cm 3 A 1.0 molar solution of triisobutylaluminum in heptane. After stirring for 30 minutes, the mixture was filtered and the obtained filter cake was dried in a vacuum oven at 140°C. A light blue / green catalyst precursor powder was produced, and the chromium...

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Abstract

A method for preparing a catalyst precursor for an olefin polymerization catalyst involves the use of aqueous or alcoholic solutions of a chromium salt and of boric acid and aluminium carboxylate for deposition onto an inorganic support material, such as a silica xerogel. The chromium salt, aluminium carboxylate and boric acid are sufficiently soluble for deposition from a single solution to be effective. The catalyst precursor can be activated by calcination to form a catalyst for homo- or co-polymerisation of alpha-olefins which has productivity and melt flow index for the resulting polymeror copolymer which is comparable to results obtained with catalysts prepared by prior art organometallic routes. The activation of the catalyst precursor gives reduced levels of toxic or noxious fumes during activation compared to use of organometallic sources of chromium or aluminium.

Description

technical field [0001] The present invention relates to porous inorganic particles loaded with chromium compounds and aluminum compounds, especially silicon oxide particles and its preparation method. The particles, particularly silica particles, can be activated to form catalyst particles for the polymerization of olefins (alpha-olefins). Background technique [0002] Active catalysts used in olefin polymerization often contain chromium oxide supported on porous inorganic supports. For many applications, alumina, if present, is preferred as part of the support itself (e.g., a silica-alumina co-gel support), or supported with chromia on a porous within the pore structure of the inorganic support. [0003] Incorporating a mixture of oxides within the molecular structure of the inorganic support tends to weaken the structure of the inorganic support, which makes it difficult for the inorganic support to achieve the high porosity required for inorganic porous support material...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F4/22
CPCC08F110/02C08F210/16C08F10/02C08F4/24C08F2500/12C08F210/14C08F2500/07C08F4/22C08F4/12C08F10/00
Inventor C·E·马斯登R·J·帕克
Owner 英国埃科维斯特催化剂技术有限公司
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