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Catalyst prepared by using M/Mn/Al hydrotalcite as precursor for producing benzyl formaldehyde by gaseous phase hydrogenation of benzoic acid or methoylbenzoatc

A technology of methyl benzoate and benzoic acid, which is applied in the field of high specific surface catalyst and high dispersion, and can solve the problems of high catalyst preparation cost and complicated method

Inactive Publication Date: 2004-02-11
FUDAN UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The preparation cost of the catalyst in the prior art is high, the method is complicated, and needs to be further improved

Method used

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Experimental program
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Embodiment

[0018] 1. Add 1.5ml Mn 3 The Al-a catalyst is loaded into a stainless steel reactor with a diameter of 5mm. Before the reaction, the catalyst is reduced by pure hydrogen. The temperature was raised to 360°C and kept for 200 minutes, and finally the temperature was programmed to rise to 420°C and kept for 150 minutes. The methyl benzoate solution is injected into the vaporizer with a metering pump, the raw material is heated to above the boiling point to completely vaporize, and then mixed with the heated hydrogen to form a raw material gas that enters the catalytic bed for reaction. The product of the reaction is condensed and received after being cooled by a cooler. The reaction is carried out at 430°C, the pressure is 1Mpa, the molar ratio of hydrogen to methyl benzoate is controlled at 20:1, and the gas hourly space velocity of hydrogen in the reaction is 700h -1 . The conversion rate of methyl benzoate is 94.5%, and the selectivity of benzaldehyde is 70.2%.

[0019] 2....

example 9

[0028] Example 9 1 94.6 83.6

example 10

[0029] Example 10 3 89.0 88.0

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PUM

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Abstract

The present invention relates to the method of applying catalyst prepared with M / Mn / Al hydrotalcite as precursor in gaseous phase hydrogenation of benzoic acid or methyl benzoate to produce benzyl formaldehyde. The M / Mn / Al hydrotalcite precursor prepared through co-precipitation process is roasted in air or nitrogen atmosphere to obtain catalyst with high dispersivity and high specific surface area. Under the catalysis of the catalyst containing Mn, Al, M (M is Mg, Zn, Pb, Ni or Cr) and K elements, the temperature of 350-500 deg.c and pressure 0.1-1.0 MPa, proper reactant ratio and materialfeeding rate, benzoic acid or methyl benzoate is gaseous phase hydrogenated to produce benzyl formaldehyde at conversion rate and selectivity over 90 %.

Description

technical field [0001] The invention relates to a method for preparing a highly dispersed and high specific surface catalyst by using the hydrotalcite structure M / Mn / Al as a precursor. Background technique [0002] Benzaldehyde is an important fine chemical product and reaction intermediate, which is widely used in the fields of medicine, pesticide, fragrance, resin additive and dyestuff. One-step hydrogenation by gas phase method can directly obtain benzaldehyde. This method is simple to operate and the product is easy to purify. In recent years, it has attracted widespread attention and a series of hydrogenation catalysts have been developed successively. In 1982, US Patent No. 4,328,373 reported that α-Al 2 o 3 Load Y 2 o 3 , ZrO 2 , CeO 2 Catalysts such as carboxylic acid (ester) for one-step hydrogenation of the corresponding aldehyde. US Patent No. 4,613,700 and Japanese Patent JK 60-152,434 respectively reported the ZrO 2 A series of catalysts are used to cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34C07C45/41
Inventor 陈爱民徐华龙乐英红华伟明沈伟高滋
Owner FUDAN UNIV
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