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Process for preparing benzaldehyde by catalytic oxidation of phenylethene

A technology for catalytic oxidation and styrene, which is applied in the oxidation preparation of carbonyl compounds, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of high equipment requirements, long reaction time, difficult product separation, etc. The effect of simple preparation and simplified process procedures

Inactive Publication Date: 2008-11-19
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there are still many problems in the production of benzaldehyde from styrene-catalyzed oxidation of styrene, such as low conversion rate, poor selectivity, low yield, long reaction time, high equipment requirements for the reaction, and difficult product separation. and other shortcomings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 1 ml of styrene, 5 ml of 30 wt% hydrogen peroxide, 10 ml of methanol and 0.05 g of Bi-SBA-15 catalyst (Si / Bi atomic ratio is 50) in a 30 ml stainless steel reactor lined with polytetrafluoroethylene , close the reaction kettle, heat the reaction kettle to 70°C, and react at a constant temperature of 70°C for 10 hours, and take samples for analysis after the material is cooled to room temperature. The reaction results are: the conversion rate of styrene is 90.7%, and the selectivity of benzaldehyde is 95.7%. In addition, the activity and selectivity of the catalyst did not decrease after 6 repeated cycles.

Embodiment 2

[0017] Add 1 ml of styrene, 2 ml of 30 wt% hydrogen peroxide, 30 ml of methanol and 0.1 g of Bi-SBA-15 catalyst (Si / Bi atomic ratio is 30) in a 30 ml stainless steel reactor lined with polytetrafluoroethylene , close the reaction kettle, heat the reaction kettle to 70°C, and react at a constant temperature of 70°C for 2 hours, and take samples for analysis after the material is cooled to room temperature. The reaction results are: the conversion rate of styrene is 92.6%, and the selectivity of benzaldehyde is 96.7%. In addition, the activity and selectivity of the catalyst did not decrease after 5 repeated cycles.

Embodiment 3

[0019] Add 1 ml of styrene, 2 ml of 30 wt% hydrogen peroxide, 10 ml of methanol and 0.006 g of Bi-SBA-15 catalyst (Si / Bi atomic ratio is 10) in a 30 ml stainless steel reactor lined with polytetrafluoroethylene , close the reaction kettle, heat the reaction kettle to 120°C, and react at a constant temperature of 120°C for 15 hours, and take samples for analysis after the material is cooled to room temperature. The reaction results are: the conversion rate of styrene is 90.7%, and the selectivity of benzaldehyde is 98.0%. In addition, the activity and selectivity of the catalyst did not decrease after 4 repeated cycles.

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Abstract

The invention provides a method for preparing benzaldehyde by catalyzing and oxidizing styrene. The method comprises the following steps that: raw materials of the styrene, oxidant, solvent and catalyzer are respectively added into a reaction vessel; the reaction vessel is heated to a temperature of between 40 and 120 DEG C and the raw materials react at a constant temperature for 1 to 15 hours; after the reaction is finished, the raw materials are cooled and separated to produce a benzaldehyde finished product, wherein, the catalyzer is an SBA-15 molecular sieve containing one or a plurality of hetero atoms; and the molar ratio between a silicon atom and a hetero atom in the catalyzer is between 5 and 200; the oxidant is a peroxide aqueous solution and a peroxyacetic acid aqueous solution; and the solvent is a monohydric alcohol, ketone and nitrile class. As the method provided by the invention adopts the SBA-15 molecular sieve containing one or the plurality of the hetero atoms as the catalyzer, the method can acquire higher styrene conversion rate and benzaldehyde selectivity; and the catalyzer has simple preparation, low cost and high stability and can be repeatedly used for a plurality of times.

Description

【Technical field】 [0001] The invention relates to the field of industrial catalysis in the petrochemical industry, in particular to a method for preparing benzaldehyde by catalytic oxidation of styrene. 【Background technique】 [0002] Benzaldehyde (Benzaldehyde), molecular formula C 7 h 6 O, with a molecular weight of 106.13, is one of the simplest but most industrially versatile aromatic aldehydes. Benzaldehyde can undergo a series of reactions such as nucleophilic addition, aldol condensation, Konizalo reaction, Panjin reaction, nitration, chlorination, etc. It is an intermediate for the manufacture of dyes and can be used for the manufacture of pharmaceuticals. Seasonings are also used for processing and synthesizing other spices and seasonings, and can also be used for the manufacture of pesticides. The production process of benzaldehyde mainly includes five kinds of toluene chlorination hydrolysis method, benzyl alcohol oxidation method, toluene direct oxidation meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/54C07C45/27B01J29/03
Inventor 尹双凤罗胜联范梁栋代威力张晓文
Owner HUNAN UNIV
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