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Catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and preparation method thereof

A technology of benzaldehyde and catalyst, which is applied in the catalyst field of direct oxidation of toluene to benzaldehyde and its preparation, and in the field of catalysts, can solve the problems of uneconomical industrial production, high reaction temperature, and difficult product separation, and achieve easy separation, purification, and reaction Mild conditions to enhance the effect of interaction

Active Publication Date: 2015-12-09
YANCHENG CITY CHUNZHU AROMA
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  • Abstract
  • Description
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Problems solved by technology

[0004] The direct oxidation of toluene to generate benzaldehyde under gas phase or liquid phase conditions is a relatively economical and environmentally friendly method. Chinese patent CN1068755 discloses a method for preparing benzaldehyde by gas phase oxidation of toluene. The selectivity of benzaldehyde prepared by this method reaches 60%, and the one-way yield of benzaldehyde can reach 16%. The method of direct oxidation of toluene through the gas phase method mainly has the defects of high reaction temperature and easy over-oxidation of toluene, and the selectivity of benzaldehyde decreases especially when the conversion rate is increased.
There are many reports about the direct oxidation of benzaldehyde under liquid phase conditions. As early as 2004, the Chinese patent No. CN1528726 disclosed a method of preparing benzene by liquid phase oxidation of toluene in an acidic or neutral ionic liquid and acetic acid mixed solvent. The method of formaldehyde is to oxidize toluene under the condition of 115~120 ℃. When the conversion rate of toluene is 42%, the selectivity of benzaldehyde is only 48%. This method uses a large number of expensive ionic liquid and acetic acid solvent, which greatly improves the production cost, and product separation is difficult, and industrial production is uneconomical. The patent CN02143361.5 of Dalian Institute of Chemical Physics discloses a preparation method for a catalyst for the oxidation of toluene to benzaldehyde. The active components of the catalyst are zirconium and other transition metals and alkali metals Or alkaline earth metal etc., use this catalyzer, at temperature 180-195 ℃, feed oxygen, react under the condition of pressure 0.8-1.2MPa, when toluene conversion rate is 13%, the selectivity of benzaldehyde is 86.6%, this method catalyst The preparation process is relatively complicated, and the oxidation is not easy to control in the aldehyde stage, and it is easier to generate benzoic acid
[0005] In summary, there is not yet a method for the production of benzaldehyde with simple reaction, energy saving and environmental protection, easy separation and recovery of product and solvent, high toluene conversion rate and benzaldehyde selectivity in the reaction

Method used

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  • Catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and preparation method thereof
  • Catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and preparation method thereof
  • Catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and preparation method thereof

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Embodiment 1

[0023] A catalyst for the direct oxidation of toluene to produce benzaldehyde, comprising the following components: 80wt% magnesia-alumina composite oxide carrier, wherein the molar ratio of magnesia to alumina is 1, cerium 10wt%, cobalt 3wt%, copper 5wt% , Nickel 2wt%.

[0024] The preparation method of above-mentioned catalyst comprises the steps:

[0025] 1) Weigh 150gAl(NO 3 ) 3 9H 2 O and 51.3gMg(NO 3 ) 2 ·6H 2 O was dissolved in 1200 mL of deionized water to make a total concentration of 0.5 mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue stirring and aging for 3 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, place in a constant temperature drying oven at 100°C an...

Embodiment 2

[0029] A catalyst for the direct oxidation of toluene to produce benzaldehyde, comprising the following components: 90wt% magnesia-alumina composite oxide carrier, wherein the molar ratio of magnesia to alumina is 1, cerium 4wt%, cobalt 5wt%, copper 0.5wt% %, nickel 0.5wt%.

[0030] The preparation method of above-mentioned catalyst comprises the steps:

[0031] 1) Weigh 150gAl(NO 3 ) 3 9H 2 O and 51.3gMg(NO 3 ) 2 ·6H 2 O was dissolved in 1200 mL of deionized water to make a total concentration of 0.5 mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue stirring and aging for 3 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, place in a constant temperature drying oven at 100°...

Embodiment 3

[0035] A catalyst for direct oxidation of toluene to produce benzaldehyde, comprising the following components: 85wt% magnesia-alumina composite oxide carrier, wherein the molar ratio of magnesia to alumina is 2, cerium 6wt%, cobalt 5wt%, copper 3wt% , Nickel 1wt%.

[0036] The preparation method of above-mentioned catalyst comprises the steps:

[0037] 1) Weigh 39.9gAlCl 3 and 28.8gMgCl 2 Dissolve in 1200mL deionized water to make a total concentration of 0.5mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue stirring and aging for 3 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, place in a constant temperature drying oven at 100°C and dry, after drying, grind and place in a m...

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Abstract

The invention relates to a catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and a preparation method thereof. The catalyst comprises the following components in percentage by weight: 85 to 90 wt% of magnesium oxide and alumina composite oxide carrier; 0.5 to 10 wt% of cerium, 0.5 to 5 wt% of cobalt, 0.1 to 5 wt% of copper, and 0.5 to 2 wt% of nickel, wherein the mole ratio of magnesium oxide to alumina is 1-2. The catalyst takes a mixture of magnesium oxide and alumina as the carrier, can directly catalyze the oxidation of toluene to prepare benzaldehyde, and has the advantages of high toluene conversion rate, high benzaldehyde selectivity, high reaction stability, excellent performance, and mild reaction conditions. Moreover, the reaction product and the reactants are in two phases, and thus separation and purification become easier.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for directly oxidizing toluene to produce benzaldehyde and a preparation method thereof, belonging to the technical field of industrial catalysis. Background technique [0002] Benzaldehyde is an important fine chemical product, which is widely used in industrial fields such as medicine, dyestuff, fragrance, pesticide and materials. The present disclosed production method of preparing benzaldehyde mainly contains following three kinds: toluene chlorination hydrolysis method, benzoic acid (ester) reduction method and toluene direct oxidation method. [0003] Chlorine is inevitably contained in the benzaldehyde produced by chlorination and hydrolysis of toluene, and chlorine cannot be contained in benzaldehyde used in industries such as medicine and spices. Therefore, the application range of benzaldehyde produced by chlorination and hydrolysis is limited. limits. Benzoic acid reduction m...

Claims

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Application Information

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IPC IPC(8): B01J23/83C07C47/54C07C45/36
Inventor 齐国良
Owner YANCHENG CITY CHUNZHU AROMA
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