Composite reduced chromium vanadium catalyst and preparation method thereof

A chromium-vanadium catalyst and catalyst technology, applied in the production of bulk chemicals, etc., can solve the problems of low active center activity, complex process, and unsatisfactory effects, and achieve high ethylene homopolymerization and copolymerization reactivity effects

Active Publication Date: 2021-12-21
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Over the years, there have been many studies on multi-active center polyethylene catalysts, but the effect is not ideal. Either the process is complicated, or the activity of multiple active centers is low due to the interaction of multiple active centers. At present, the industrialization of wide bimodal polyethylene is mostly produced by mixed processing methods. , resulting in uneven performance of the resin

Method used

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  • Composite reduced chromium vanadium catalyst and preparation method thereof
  • Composite reduced chromium vanadium catalyst and preparation method thereof
  • Composite reduced chromium vanadium catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Select commercially available Davison 955 silica gel as the inorganic carrier; weigh 1.043g of chromium acetate, 0.2790g of ammonium metavanadate (the loading of chromium is 0.30wt%) (the loading of vanadium is 0.30wt%) and add them to 200ml of distilled water at 60°C , using continuous stirring, the stirring speed is 240 rpm to dissolve, and the dissolution time is 30min; then 40g of silica gel is soaked in the solution, and soaked at 60°C for 3h to make the active components evenly adsorbed in the micropores of silica gel; the above-mentioned whole process belongs to physical adsorption process. After drying at 120°C for 20 hours, transfer it to a fluidized bed for roasting, raise it to 200°C in a high-purity nitrogen atmosphere and keep it for 1 hour to remove physical water, then pass through dry air at 600°C for 4 hours, and then cool down naturally under nitrogen for later use .

[0060] Mix diethylaluminum ethoxide and triethylaluminum in a n-hexane solution at ...

Embodiment 2

[0064] Select commercially available Davison 955 silica gel as the inorganic carrier; weigh 1.043g chromium acetate (the chromium loading is 0.30wt%), weigh 0.1836g ammonium metavanadate (the vanadium loading is 0.20wt%) and dissolve in 200ml, 60°C Dissolve in distilled water with continuous stirring at a stirring speed of 240 rpm for 30 minutes; then soak 40 g of silica gel in the solution for 3 hours at 60 ° C to make the active components evenly adsorbed in the micropores of the silica gel; the above-mentioned whole The process belongs to the physical adsorption process. After drying at 120°C for 20 hours, transfer it to a fluidized bed for roasting, raise it to 200°C in a high-purity nitrogen atmosphere and keep it for 1 hour to remove physical water, then pass through dry air at 600°C for 4 hours, and then cool down naturally under nitrogen for later use .

[0065] Mix diethylaluminum ethoxy and triethylaluminum in a n-hexane solution at a molar ratio of 3:2 to prepare a...

Embodiment 3

[0069] Select commercially available Davison 955 silica gel as the inorganic carrier; weigh 1.043g chromium acetate, 0.3060g ammonium metavanadate (0.30wt% chromium loading, 0.50wt% vanadium loading), weigh and dissolve in 200ml, 60°C Dissolve in distilled water with continuous stirring at a stirring speed of 240 rpm for 30 minutes; then soak 40 g of silica gel in the solution for 3 hours at 60°C so that the active components are evenly adsorbed in the micropores of the silica gel; the above-mentioned whole The process belongs to the physical adsorption process. After drying at 120°C for 20 hours, transfer it to a fluidized bed for roasting, raise it to 200°C in a high-purity nitrogen atmosphere and keep it for 1 hour to remove physical water, then pass through dry air at 600°C for 4 hours, and then cool down naturally under nitrogen for later use .

[0070] Mix diethylaluminum ethoxy and triethylaluminum in a n-hexane solution at a molar ratio of 3:5 to prepare a mixed reduc...

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Abstract

The invention relates to a composite reduced chromium vanadium catalyst and a preparation method thereof, comprising an active component and an inorganic carrier, the active component being a mixture of vanadium metal compound and chromium metal compound, the inorganic carrier being an inorganic oxide, and the reducing agent being an organic Mixture of metal compounds. The preparation method of the composite reduced chromium vanadium composite polyethylene catalyst of the present invention, the chromium vanadium catalyst has the characteristics of high activity, wide molecular weight distribution or bimodal bimodal distribution of the polyethylene product obtained by polymerization, good catalytic activity of the inventive catalyst, and simple preparation process.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a composite reduced chromium vanadium catalyst and a preparation method thereof. Background technique [0002] Polyethylene (PE) resin is a kind of thermoplastic polymerized by ethylene monomer. It is one of the general-purpose plastic products with the largest output and consumption in the world today. It mainly includes low-density polyethylene (LDPE), linear low-density polyethylene Ethylene (LLDPE), high-density polyethylene (HDPE) and some polyethylenes with special properties. Polyethylene has excellent mechanical properties, electrical insulation, chemical corrosion resistance, low temperature resistance and excellent processability. Polyethylene products are widely used in various fields such as industry, agriculture, automobile, communication and daily life. Currently known polyethylene catalysts mainly include Ziegler-Natta catalysts, chromium-based catalysts, metallocene catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F210/16C08F210/08C08F4/69C08F2/34
CPCC08F2/34C08F4/69C08F110/02C08F210/16C08F2500/04C08F2500/05C08F2500/12C08F210/08Y02P20/52
Inventor 范大鹏严婕李留忠徐晓齐立芳
Owner CHINA PETROLEUM & CHEM CORP
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