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Method for preparing magnetic microspheric alumina support

A technology of alumina carrier and magnetic microsphere, which is applied in the direction of catalyst carrier, chemical instrument and method, catalyst activation/preparation, etc. It can solve the problems of low magnetism of magnetic microsphere catalyst, difficulty in effective control of catalyst, and small specific saturation magnetization. , to improve the service life, avoid wear and loss, enhance the effect of adhesion

Active Publication Date: 2008-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN1690035A provides a kind of γ-Fe 2 o 3 As a magnetic core, the magnetic microspherical alumina carrier is prepared by the microemulsion dispersion molding method in oil, and the carrier is loaded with noble metal catalyst Pd, which is used in the hydrogenation method of alkyl anthraquinone in the magnetically stabilized bed, but the prepared magnetic microsphere Spherical catalysts have low magnetic properties and small specific saturation magnetization, which makes it difficult to effectively control the catalyst in a magnetically stable bed
However, in the preparation process, the spinel ferrite material must be coated, the preparation process is relatively complicated, and the production cost of the carrier is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mg(NO 3 ) 2 ·6H 2 O, FeCl 3 and FeCl 2 The mixed salt solution (according to the stoichiometric ratio of 2.1:1:1), so that the concentration of metal ions in the solution is respectively Mg 2+ 0.2M, Fe 2+ 0.2M, Fe 3+ It is 0.2M. Pour the mixed salt solution into the container, under N 2 Under the condition of protection, slowly drop into the container NaOH concentration is 1.5M, NaOH 2 CO 3 For the mixed alkali solution with a concentration of 0.5M, when the pH value in the system reaches 11.5, stop adding alkali solution dropwise. then in N 2 Under protected conditions, crystallize in a water bath at 20°C for 10 hours, then filter and wash with ice water passing through nitrogen to obtain Mg-containing 2- -Fe 2+ -Fe 3+ The filter cake (LDS, LayeredDouble Hydroxides, hydrotalcite substances). Put the filter cake in a vacuum dryer to dry at 40°C, and then bake it to 1200°C to obtain a spinel ferrite magnetic core, the chemical formula is MgFe 2 o 4 .

[...

Embodiment 2

[0035] Keep other preparation conditions in Example 1 unchanged, add MgFe by 25% of the weight of the magnetic substance in the finally obtained magnetic microspherical alumina carrier 2 o 4 in aluminum sol.

[0036] The measured specific saturation magnetization of the carrier is 6.5 emu / g, and the crystal form is γ type.

Embodiment 3

[0038] Keeping other preparation conditions in Example 1 unchanged, hexamethylenetetramine was replaced by urea when preparing the magnetic alumina carrier, and the aging temperature and aging time were changed to 120° C. and 16 hours, respectively.

[0039] The specific saturation magnetization of the carrier is 2.6emu / g, and the crystal form is γ type.

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Abstract

The invention relates to a preparation method for a magnetic microsphere type alumina carrier. The invention is characterized in that spinel ferrite magnetic core is roasted at the high temperature, ground into ferrite powder, processed with acid, then washed, dried, and dispersed into alumina sol, and then shaped into the magnetic microsphere type aluminum oxide carrier by an oil column.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier, and more particularly relates to a method for preparing a magnetic microspherical alumina carrier. Background technique [0002] In petroleum processing, gas-liquid-solid reactors are usually carried out in fixed-bed reactors or fluidized-bed reactors. After years of application, combined with the processing characteristics of different processes, people have made a lot of improvements to the traditional fixed bed and fluidized bed, so that the fixed bed and fluidized bed have been widely used, but the traditional fixed bed and fluidized bed except In addition to their respective advantages, there are some shortcomings that cannot be made up by simple improvements. For example, in a fluidized bed, due to the intense axial mixing, usually the conversion rate is not high, and the catalyst is easily taken out, and after being taken out, it needs to be separated by filtration; in a fixed ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J37/03B01J21/04B01J8/00
Inventor 董明会潘智勇宗保宁孟祥堃张晓昕慕旭宏王宣
Owner CHINA PETROLEUM & CHEM CORP
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