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Method for continuously preparing copper-zinc-aluminum catalyst

A copper-zinc-aluminum catalyst, zinc-aluminum technology, applied in the field of biomedicine, can solve the problems of reducing sufficient mixing and contact between materials, easy blockage of sedimentation slurry, unfavorable grain maturation, etc., to achieve continuous large-scale production, throughput Large, the effect of catalyst activity improvement

Active Publication Date: 2020-12-29
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although these two disclosed methods have achieved continuous preparation of copper-zinc-aluminum catalysts, due to the fine channel and small flux of the microchannel reactor, the precipitated slurry formed is easy to block the channel, thereby limiting large-scale production and application. The materials in the microchannel reactor belong to plug flow, which also reduces the sufficient mixing and contact between materials, which is not conducive to the ripening of grains

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  • Method for continuously preparing copper-zinc-aluminum catalyst

Examples

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Embodiment 1

[0042] In this example, the continuous preparation of the copper-zinc-aluminum catalyst is carried out according to the steps of the above-mentioned preparation method. In the prepared zinc-aluminum solution, the concentration of zinc nitrate is 5.0 g / 100 ml as zinc oxide, and the concentration of aluminum nitrate is 5.0 g / 100 ml as aluminum oxide. Count as 3.0g / 100ml; In the prepared copper-zinc solution, the concentration of copper nitrate is 3.6g / 100ml with copper oxide; the concentration of zinc nitrate is 6.1g / 100ml with zinc oxide; Sodium oxide is calculated as 7.0g / 100ml. In step S2, the reaction temperature is controlled at 50° C., and the reaction materials stay in the reactor for 20 minutes.

[0043] The specific surface area of ​​the copper-zinc-aluminum catalyst obtained is 65.2m 2 / g, the pore volume is 0.25ml / g, and the bulk specific gravity is 1.34g / ml. The obtained copper-zinc-aluminum catalyst is tested by the method of the above-mentioned activity test. After...

Embodiment 2

[0045] In this example, the continuous preparation of the copper-zinc-aluminum catalyst is carried out according to the steps of the above-mentioned preparation method. In the prepared zinc-aluminum solution, the concentration of zinc nitrate is 6.0 g / 100 ml as zinc oxide, and the concentration of aluminum nitrate is 6.0 g / 100 ml as aluminum oxide. Count as 2.5g / 100ml; In the prepared copper-zinc solution, the concentration of copper nitrate is 3.4g / 100ml with copper oxide; the concentration of zinc nitrate is 6.3g / 100ml with zinc oxide; Sodium oxide is calculated as 6.5g / 100ml. In step S2, the reaction temperature is controlled at 75° C., and the reaction materials stay in the reactor for 17 minutes.

[0046] The specific surface area of ​​the obtained copper-zinc-aluminum catalyst is 66.3m 2 / g, the pore volume is 0.24ml / g, and the bulk specific gravity is 1.32g / ml. The obtained copper-zinc-aluminum catalyst is tested by the method of the above-mentioned activity test. After...

Embodiment 3

[0048] In this example, the continuous preparation of the copper-zinc-aluminum catalyst is carried out according to the steps of the above-mentioned preparation method. In the prepared zinc-aluminum solution, the concentration of zinc nitrate is 6.2 g / 100 ml as zinc oxide, and the concentration of aluminum nitrate is 6.2 g / 100 ml as aluminum oxide. Count as 3.5g / 100ml; In the prepared copper-zinc solution, the concentration of copper nitrate is 3.1g / 100ml with copper oxide; the concentration of zinc nitrate is 6.8g / 100ml with zinc oxide; The sodium oxide is calculated as 7.3g / 100ml. In step S2, the reaction temperature is controlled at 85° C., and the reaction materials stay in the reactor for 13 minutes.

[0049] The specific surface area of ​​the obtained copper-zinc-aluminum catalyst is 68.5m 2 / g, the pore volume is 0.25ml / g, and the bulk specific gravity is 1.33g / ml. The obtained copper-zinc-aluminum catalyst is tested by the method of the above-mentioned activity test. A...

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Abstract

The invention relates to a method for continuously preparing a copper-zinc-aluminum catalyst. The method comprises the following steps: preparing a zinc-aluminum solution and a copper-zinc solution from a zinc nitrate solution, an aluminum nitrate solution and a copper nitrate solution, injecting the zinc-aluminum solution and a sodium carbonate solution into a reaction cavity of a tubular reactorfrom one end of the tubular reactor, and reacting to obtain precursor slurry containing zinc-aluminum precipitated particles; enabling the zinc-aluminum solution and the sodium carbonate solution toadvance towards the other end of the tubular reactor while mixing and reacting, injecting the copper-zinc solution and the sodium carbonate solution into the reaction cavity from the middle part of the tubular reactor, continuously mixing and reacting with precursor slurry containing zinc-aluminum precipitation particles in the reaction cavity, and advancing to the other end of the tubular reactorto be discharged; and carrying out suction filtration, washing and drying on the discharged material, and carrying out roasting and molding treatment to obtain the copper-zinc-aluminum catalyst. According to the method, local backmixing in the preparation process is eliminated, the activity of the catalyst is improved, the adopted reactor effectively avoids blockage of a reaction channel, and continuous large-scale production is realized.

Description

technical field [0001] The invention relates to the field of biomedicine, in particular to a method for continuously preparing a copper-zinc-aluminum catalyst. Background technique [0002] Copper-zinc-aluminum catalysts have the advantages of low price, low toxicity and good catalytic activity, and are widely used in organic catalytic reactions. Copper-zinc-aluminum catalysts have very low reactivity to C-C bond hydrogenolysis, but show good reactivity to C-O bond hydrogenolysis. Copper can play a very good selective catalytic role in many reactions, including methanol synthesis catalysts, CO low temperature shift catalyst, carbonyl aldehyde hydrogenation catalyst, fatty acid ester hydrogenation catalyst, glycerin hydrogenolysis catalyst, nitrobenzene to aniline catalyst and cyclohexanol dehydrogenation to cyclohexanone catalyst, etc. [0003] Studies have shown that the synergistic effect between copper, zinc and aluminum and the specific surface area of ​​Cu play an impo...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J35/10C07C29/17C07C31/125
CPCB01J23/002B01J23/80C07C29/175B01J2523/00B01J35/613B01J35/633B01J2523/17B01J2523/27B01J2523/31C07C31/125Y02P20/52
Inventor 张志华刘涵澎李磊王煦蒋达洪崔宝臣孙婧
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH