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Composite oxide and preparation method and application thereof

A composite oxide and catalytic reaction technology, applied in the field of catalysis, can solve the problems of difficult regeneration, low isophorone selectivity, and high cost, and achieve the effects of easy industrial scale-up production, inhibition of further condensation, and reduction of side reactions

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the technical problems of complex catalyst preparation process, high cost, short life, difficult regeneration and low isophorone selectivity in the prior art, and to provide composite oxides and their preparation methods and applications

Method used

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  • Composite oxide and preparation method and application thereof

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Embodiment approach

[0044] According to a preferred embodiment of the present invention, the preparation method of the composite oxide is:

[0045] Formulate the Group IIA metal precursor and the lanthanum precursor into a solution C; then prepare a precipitant solution A so that the weight concentration of the precipitant in the precipitant solution is 3-25% by weight; reprepare the aluminum precursor suspension B, and The pH of solution B is 11-12, and the mass ratio of the aluminum precursor to the solvent used to prepare suspension B is 0.1-0.5:1; then solution A and solution C are added to suspension B in parallel to form Mixed system; during the process of preparing the mixed system, keep the temperature of the mixed system at 38-60°C, and based on 1g of aluminum precursor, the addition rate of the lanthanum precursor is 0.2-1g / min, preferably 0.5-0.8g / min; then aging, the aging temperature is preferably 60-100 ° C, the time is preferably 3-15 hours; cooling at a temperature of 25-40 ° C fo...

Embodiment 1

[0055] Get 87.3g magnesium nitrate, 16.1g calcium nitrate and 17.7g lanthanum nitrate and dissolve in 1140g deionized water, be mixed with nitrate solution A, take ammoniacal liquor (weight concentration 25%) subsequently and dilute to weight concentration with deionized water and be 8% by weight , prepared into alkaline solution B, and then mixed 23.3g of pseudo-boehmite with 100g of deionized water and stirred evenly, then dripped ammonia water to adjust the pH to 11 to prepare suspension C. Keep the C suspension at 40 °C and add solutions A and B co-flow to C with stirring while stabilizing the pH at 10. Based on 1 g of pseudo-boehmite, the addition rate of the nitrate solution A was 0.5 g / min; after the addition, the mixed solution was heated to 80° C. and aged for 4 hours. After standing and cooling at 25° C. for 24 hours, solid-liquid separation was carried out, and then the filter cake was washed with deionized water until the pH value of the filtrate was 8. Finally, d...

Embodiment 2

[0057] Get 179.9g magnesium nitrate and 1.5g lanthanum nitrate and dissolve in 2000g deionized water, be mixed with nitrate solution A, then take ammoniacal liquor (weight concentration 25%) and dilute to weight concentration with deionized water to be 15% by weight, be mixed with alkaline solution B, take 20g of pseudo-boehmite and mix with 150g of deionized water and stir evenly, then add ammonia water to adjust the pH to 11 to prepare suspension C. Keep solution C at 60 °C, and add solutions A and B co-flow to C with stirring while stabilizing the pH at 10. Based on 1 g of pseudo-boehmite, the addition rate of the nitrate solution A was 0.8 g / min; after the addition, the mixed solution was heated to 90° C. and aged for 6 hours. After standing and cooling at 30° C. for 12 hours, solid-liquid separation was carried out, and then the filter cake was washed with deionized water until the pH value of the filtrate was 9. Finally, it was dried in an oven at 120° C. for 5 hours, a...

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Abstract

The invention relates to the field of catalysis, and discloses a composite oxide and a preparation method and application thereof. The composite oxide comprises M, Al and La, M is Ca and / or Mg, and the molar ratio of M to Al to La is (0.3-4.5): 1: (0-0.2). The composite oxide is low in cost and easy to regenerate, has relatively good pore volume, pore diameter and specific surface area, has a proper amount of acidic centers and alkaline centers, and can be used for preparing a porous material through the synergistic effect of the acidic centers and the alkaline centers. The method can promote the selective reaction for preparing isophorone through acetone condensation at low temperature, inhibits further condensation of acetone, reduces side reactions, and is easy for industrial application.

Description

technical field [0001] The invention relates to the field of catalysis, in particular to a composite oxide and its preparation method and application. Background technique [0002] Isophorone is one of the downstream value-added products of acetone. 30% of the global isophorone production is used in the production of isophorone diamine and isophorone diisocyanate, and the remaining 70% is used in the production of pharmaceuticals , disinfectants, pesticides and solvents. Isophorone has a high boiling point, low hygroscopicity, good dissolving ability, dispersibility and leveling property, and is a good solvent for polymer materials. It can dissolve nitrocellulose, acrylate, alkyd resin, polyester and cyclic Oxygen resin etc. In terms of medicine, 3,3,5-trimethylcyclohexanol produced by catalytic hydrogenation of isophorone is a widely used product, and the medicine cyclomandelate prepared from it is a vasodilator, suitable for Cerebral arteriosclerosis, sequelae of trauma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J37/03B01J35/10C01F17/229C01F17/10C01F11/02C01F5/02C01F7/44C07C45/74C07C49/603
CPCB01J23/10B01J23/002B01J37/031C01F17/229C01F17/10C01F11/02C01F5/02C01F7/44C07C45/74C01P2006/12C01P2006/14C01P2006/16C01P2004/82B01J2523/00B01J35/40B01J35/615B01J35/635B01J35/633B01J35/638B01J35/647B01J2523/22B01J2523/23B01J2523/31B01J2523/3706C07C49/603
Inventor 宋超田保亮唐国旗向良玉
Owner CHINA PETROLEUM & CHEM CORP
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