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Preparation and Application of a Supported Metal Oxide Double Active Site Ethylene Polymerization Catalyst

A catalyst, supported technology, used in the production of bulk chemicals, etc.

Active Publication Date: 2017-12-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no report on the use of supported vanadium oxide as the active center of olefin polymerization, and there is also no report on the introduction of supported vanadium oxide as an active component into Phillips chromium-based catalysts.

Method used

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  • Preparation and Application of a Supported Metal Oxide Double Active Site Ethylene Polymerization Catalyst
  • Preparation and Application of a Supported Metal Oxide Double Active Site Ethylene Polymerization Catalyst
  • Preparation and Application of a Supported Metal Oxide Double Active Site Ethylene Polymerization Catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] 10g silica gel (pore volume is 1.5-1.7cm 3 / g, the surface area is 250-300m 2 / g) impregnated in an aqueous solution of vanadyl oxalate (V load is 0.48wt%), continuously stirred and impregnated in an oil bath at 40°C for 5h, then heated to 120°C for 5h, and then transferred to 120°C for oven drying for 6h; the impregnated The silica gel carrier of vanadyl oxalate is placed in a quartz fluidized bed for roasting and activation. The high-purity air is kept at 450°C for 4 hours, and the silica gel is finally cooled and transferred under nitrogen. The above roasting process is as follows: figure 1 shown. The obtained sample was impregnated with basic chromium acetate aqueous solution (0.5wt% Cr loading) again, after impregnating with continuous stirring at room temperature for 4 hours, dried at 120°C for 4 hours, and then transferred to a 120°C oven for 6 hours; the dried sample was placed in a quartz Carry out roasting activation in the fluidized bed, roast at 600°C in t...

Embodiment 2

[0079] 10g silica gel (pore volume is 1.5-1.7cm 3 / g, the surface area is 250-300m 2 / g) immersed in an aqueous solution of basic chromium acetate and ammonium metavanadate (Cr load is 0.5wt%, V load is 0.48wt%), stirred and impregnated in an oil bath at 60°C for 4h, dried at 120°C for 4h, Then transferred to 120°C oven for drying for 6 hours; the dried sample was placed in a quartz fluidized bed for calcination and activation, kept in air at 500°C for 5 hours, and then cooled and transferred naturally under the protection of nitrogen to obtain the catalyst for storage until use.

Embodiment 3

[0081] 10g silica gel (pore volume is 1.5-1.7cm 3 / g, the surface area is 250-300m 2 / g) impregnated in an aqueous solution of vanadyl sulfate (V load 0.16wt%), continuously stirred and impregnated at room temperature for 4h, dried at 120°C for 4h, and then transferred to a 120°C oven for 6h; the dried catalyst was placed in a quartz fluidized bed Roasting and activation were carried out in the oven, kept at 500°C for 4 hours in the air, and cooled naturally under the protection of nitrogen. The obtained sample was impregnated with basic chromium acetate solution (Cr load 0.5wt%) again, stirred and impregnated at room temperature for 4h, dried at 120°C for 4h, and then transferred to an oven for 6h; the dried sample was placed in a quartz fluidized bed for Roasting activation, in the air at 600°C, keep warm for 4h, and cool naturally under the protection of nitrogen, the roasting procedure is as follows figure 2 , the catalyst is obtained and stored for later use.

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Abstract

Preparation and application of a supported chromium vanadium metal oxide double active center ethylene polymerization catalyst. It is characterized in that: the loaded vanadium active component is introduced on the Phillips chromium series catalyst. The catalyst composition includes an inorganic carrier and supported two active components, and the two active components include chromium oxide and vanadium oxide. The preparation method of the catalyst is as follows: the chromium salt and the vanadium salt are impregnated on the inorganic support according to a certain ratio through the step-by-step or co-impregnation method, and the catalyst is obtained by roasting at high temperature after drying. The supported chromium-vanadium double-active center catalyst described in the invention is a catalyst for efficiently preparing polyethylene, and can be used for preparing ethylene homopolymers or copolymers of ethylene and α-olefins. The catalyst has high polymerization activity, wide molecular weight distribution of polyethylene products (some products show bimodal distribution), hydrogen adjustment sensitivity and good copolymerization performance, and it is not necessary to modify the existing equipment for preparing polyethylene using Phillips catalyst, so it can be easily popularized and applied .

Description

technical field [0001] The invention relates to the preparation and application of a supported chromium vanadium metal oxide double active center ethylene polymerization catalyst, which is characterized in that: a loaded vanadium active component is introduced into a traditional supported Phillips chromium catalyst, and the catalyst consists of It includes an inorganic carrier and supported two active components, and the two active components include chromium oxide and vanadium oxide. The invention relates to a preparation method of a novel supported chromium-vanadium double-active center catalyst and its application in the production of ethylene homopolymer and ethylene-α-olefin copolymer. The supported chromium-vanadium double-active center catalyst has the characteristics of high activity, wide molecular weight distribution (some products show bimodal distribution), hydrogen tuning response and excellent copolymerization performance. Background technique [0002] As a ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F210/16C08F210/02C08F4/69C08F4/68C08F4/02
CPCY02P20/52
Inventor 程瑞华薛新董璇何芸何雪莲刘振刘柏平
Owner EAST CHINA UNIV OF SCI & TECH
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