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A kind of method for preparing benzaldehyde by selective catalytic oxidation of benzyl alcohol in low temperature gas phase

A technology for catalytic oxidation and benzyl alcohol, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds. It can solve problems such as narrow temperature tolerance range, poor catalyst activity, and high reaction temperature, and reduce energy consumption. , good catalytic performance, low reaction temperature effect

Active Publication Date: 2015-11-11
中德晨晰环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The present invention aims to solve the problems of high reaction temperature, poor catalyst activity, low selectivity and too narrow temperature tolerance range in the existing gas-phase oxidation reaction of benzyl alcohol to generate benzaldehyde, and provides a low-temperature gas-phase selective catalytic The method that oxidizes benzyl alcohol to prepare benzaldehyde

Method used

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specific Embodiment approach 1

[0024] Specific embodiment one: a kind of low-temperature vapor-phase selective catalytic oxidation of benzyl alcohol of present embodiment prepares the method for benzaldehyde, carries out according to the following steps:

[0025] Put the solid catalyst Ag / SBA-15 into the normal-pressure fixed-bed reactor, and inject the liquid benzyl alcohol into the preheating furnace at 206 ° C ~ 300 ° C by using the feeding pump to completely vaporize the liquid benzyl alcohol to obtain vaporized benzyl alcohol , and then take the gas flow of vaporized benzyl alcohol as X, the gas flow of oxygen in the oxygen source as Y and the gas flow of N 2 The gas flow rate of Z will be the vaporized benzyl alcohol, oxygen source and N 2 At the same time, it is passed into a fixed-bed reactor at normal pressure, and the continuous reaction is carried out at a temperature of 210°C to 400°C to obtain benzaldehyde; the gas flow rate X of the vaporized benzyl alcohol and the gas of oxygen in the oxygen ...

specific Embodiment approach 2

[0033] Specific embodiment two: the difference between this embodiment and specific embodiment one is that: the solid catalyst Ag / SBA-15 is prepared by impregnation method, and the mass percentage of Ag in the solid catalyst Ag / SBA-15 is 0.01% to 50%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the preparation method of the solid catalyst Ag / SBA-15 is carried out according to the following steps: the SBA-15 carrier is impregnated in a concentration of 0.001mol / L-5mol / L water-soluble Ag salt solution, then magnetically stirred for 2h-24h at a temperature of 20°C-100°C and a speed of 60rpm-1000rpm, and filtered to obtain a solid catalyst. Wash the obtained solid catalyst with deionized water for 1 to 5 times, then place it in an oven at a temperature of 50°C to 200°C for 1h to 48h, and then place it at a temperature of 400°C to 700°C for 1h to 24h to obtain a solid Catalyst Ag / SBA-15. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing benzaldehyde through low-temperature gas-phase selective catalytic oxidation of benzyl alcohol, relating to a method for preparing benzaldehyde through gas-phase selective catalytic oxidation of benzyl alcohol under a low-temperature condition. The method is used for solving the problems of high reaction temperature, poor catalyst activity, low selectivity and extremely narrow temperature tolerance range in the existing reaction of generating benzaldehyde through gas-phase oxidation of benzyl alcohol. The method comprises the following steps: under normal pressure, adopting a solid catalyst Ag / SBA-15; gasifying the substrate benzyl alcohol and feeding into a fixed-bed reactor; by taking molecular oxygen as an oxygen source and N2 as carrier gas, performing a continuous reaction for preparing benzaldehyde through gas-solid phase catalytic oxidation of benzyl alcohol at certain reaction temperature. According to the method disclosed by the invention, the adopted catalyst can realize low-temperature gas-phase high-selectivity oxidation of benzyl alcohol to synthesize benzaldehyde on the premise of providing relatively high activity, thereby being favorable for realizing industrial production of benzaldehyde preparation through gas-phase oxidation of benzyl alcohol. The method disclosed by the invention can be used for preparing benzaldehyde through gas-phase selective catalytic oxidation of benzyl alcohol at relatively low temperature.

Description

technical field [0001] The invention relates to a method for preparing benzaldehyde by gas-phase selective catalytic oxidation of benzyl alcohol under low temperature conditions. Background technique [0002] Benzaldehyde is an important intermediate in organic synthesis, widely used in cosmetics, spices, food, and pharmaceutical industries. At present, benzaldehyde is produced by direct oxidation of toluene or liquid-phase oxidation of benzyl alcohol in industrial production and laboratory preparation. These methods often have many by-products, low selectivity, and difficult separation of products, which limits the application of benzaldehyde. [0003] In recent years, using molecular oxygen as the oxidant, using a fixed-bed reactor in a heterogeneous system, and using a solid catalyst to selectively oxidize benzyl alcohol in the gas phase to prepare benzaldehyde, due to the small number of by-products and the green and environmentally friendly reaction process, it has attr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/54C07C45/38B01J29/035
CPCB01J29/0325B01J2229/20C07C45/38C07C47/54
Inventor 贾丽华郭祥峰马良
Owner 中德晨晰环保工程有限公司
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