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Composite catalyst for acraldehyde synthesis as well as preparation method and application thereof

A technology of composite catalyst and acrolein, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds, etc. It can solve the problems of poor heat dissipation, exacerbated risk of overheating, and large heat release.

Active Publication Date: 2021-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the selective oxidation of propylene to acrolein is often accompanied by side reactions of partial deep oxidation, by-products such as acetaldehyde, acetic acid, carbon monoxide, and carbon dioxide will be generated. Seriously reduce product yield
[0003] On the other hand, the methods for preparing the molybdenum-bismuth (Mo-Bi) metal composite oxide catalysts in the prior art mostly use the metal compound to make a solution, then add insoluble oxides for heating, evaporation, and then calcining, crushing and molding Most of the obtained catalysts have an integrated structure, which has poor heat dissipation ability during the reaction and is prone to accumulation of reactants, which may further aggravate the risk of overheating during use.

Method used

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  • Composite catalyst for acraldehyde synthesis as well as preparation method and application thereof
  • Composite catalyst for acraldehyde synthesis as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 200 grams of ammonium heptamolybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 (2), 91.6 gram of bismuth nitrate, 57.8 gram of iron nitrate, 49.5 gram of cobalt nitrate, 69.3 gram of nickel nitrate, be dissolved in 500ml deionized water, obtain active component compound aqueous dispersion, dry under the condition of 80-180 degree, will The resulting block was pulverized to a mesh size of 100 or less to obtain active ingredient powder.

[0048]Using silica sol (ammonia type, 40wt%) as a binding agent, the active component powder is granulated in a rolling ball machine to obtain particles with an average diameter of 3.5mm, and then use graphite and γ-Al 2 o 3 The mixture (mass ratio 30:70) was coated on the surface of the active component particles, and the ball was rolled to obtain a spherical catalyst with an average diameter of 5.0mm. Finally, it was calcined and activated at 550°C for 6 hours to obtain the final catalyst product.

[0049] The comparison catalysts were evaluated...

Embodiment 2

[0051] 200 grams of ammonium heptamolybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 (2), 91.6 gram of bismuth nitrate, 57.8 gram of iron nitrate, 49.5 gram of cobalt nitrate, 69.3 gram of nickel nitrate, be dissolved in 500ml deionized water, obtain active component compound aqueous dispersion, dry under the condition of 80-180 degree, will The resulting block was pulverized to a mesh size of 100 or less to obtain active ingredient powder.

[0052] Using silica sol (ammonia type, 40wt%) as a binding agent, the active component powder is granulated in a rolling ball machine to obtain particles with an average diameter of 3.5mm, and then use graphite and γ-Al 2 o 3 The mixture (mass ratio 40:60) was coated on the surface of the active component particles, and the ball was rolled to obtain a spherical catalyst with an average diameter of 5.0mm. Finally, it was activated by calcination at 550°C for 6 hours to obtain the final catalyst product.

[0053] The comparison catalysts were evalua...

Embodiment 3

[0055] 200 grams of ammonium heptamolybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 (2), 91.6 gram of bismuth nitrate, 57.8 gram of iron nitrate, 49.5 gram of cobalt nitrate, 69.3 gram of nickel nitrate, be dissolved in 500ml deionized water, obtain active component compound aqueous dispersion, dry under the condition of 80-180 degree, will The resulting block was pulverized to a mesh size of 100 or less to obtain active ingredient powder.

[0056] Using silica sol (ammonia type, 40wt%) as a binding agent, the active component powder is granulated in a rolling ball machine to obtain particles with an average diameter of 3.5mm, and then use graphite and γ-Al 2 o 3 The mixture (mass ratio 50:50) was coated on the surface of the active component particles, and the ball was rolled to obtain a spherical catalyst with an average diameter of 5.0mm. Finally, it was calcined and activated at 550°C for 6 hours to obtain the final catalyst product.

[0057] The comparison catalysts were evaluate...

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Abstract

The invention discloses a composite catalyst for acraldehyde synthesis as well as a preparation method and application of the composite catalyst. The composite catalyst comprises an inner core composed of active components and a shell which covers the surface of the inner core and is made of an inert porous material. When the catalyst is applied to the process of synthesizing acraldehyde through propylene oxidation, the temperature runaway phenomenon can be effectively inhibited, side reactions are reduced, and the product yield is increased.

Description

technical field [0001] The invention belongs to the technical field of acrolein synthesis method, and in particular relates to a composite catalyst for acrolein synthesis, a preparation method and application thereof. Background technique [0002] Acrolein is an important chemical intermediate, mainly used in the synthesis of chemical products such as acrylic acid, methionine, pyridine, and glutaraldehyde. At present, the selective oxidation of propylene is often used in the industrial production of acrolein, which oxidizes propylene to acrolein by using a catalyst such as molybdenum-bismuth (Mo-Bi) composite oxide. Since the selective oxidation of propylene to acrolein is often accompanied by side reactions of partial deep oxidation, by-products such as acetaldehyde, acetic acid, carbon monoxide, and carbon dioxide will be generated. Seriously reduce the product yield. [0003] On the other hand, the methods for preparing the molybdenum-bismuth (Mo-Bi) metal composite oxi...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J35/02B01J35/08C07C45/35C07C47/22
CPCB01J23/8876B01J23/002C07C45/35B01J2523/00B01J35/398B01J35/50B01J35/51B01J2523/31B01J2523/41B01J2523/54B01J2523/68B01J2523/842B01J2523/845B01J2523/847C07C47/22
Inventor 徐文杰杨斌宋卫林王伟华奚美珍李盛林
Owner CHINA PETROLEUM & CHEM CORP
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