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Process for synthesizing benzaldehyde by selective oxidation of toluene

A selective oxidation and benzaldehyde technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carbon-based compounds, etc., can solve problems such as uneven distribution and difficult mass transfer

Inactive Publication Date: 2005-09-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems such as uneven distribution and mass transfer difficulties in the solid catalyst in the reactor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: The oxidation reaction of toluene was carried out in a 500mL reactor, and 140g of toluene, 0.85g of manganese bromide, 0.7g of cobalt acetate tetrahydrate and 42g of glacial acetic acid were added, the top of the kettle was sealed, heated to 120°C, and the reaction was carried out with oxygen flow. The reaction temperature was raised to 130° C. and controlled to react at this temperature, the reaction pressure was 1.0 MPa, and the reaction time was 240 minutes. After the reaction, the reaction system was lowered to room temperature, the lid of the kettle was opened, and samples were taken for analysis. The product analysis was completed once on a HP 4890 gas chromatograph using the internal standard method. The reaction results are shown in Table 1.

Embodiment 2

[0014] Example 2: The oxidation reaction of toluene was carried out in a 500mL reactor, and 140g of toluene, 0.85g of cobalt bromide, 0.7g of manganese acetate tetrahydrate and 42g of glacial acetic acid were added, the top of the kettle was sealed, heated to 120°C, and the reaction was carried out with oxygen flow. The reaction temperature was raised to 130° C. and controlled to react at this temperature, the reaction pressure was 1.0 MPa, and the reaction time was 60 minutes. After the reaction, the reaction system was lowered to room temperature, the lid of the kettle was opened, and samples were taken for analysis. Analysis method is with embodiment 1. The reaction results are shown in Table 1.

Embodiment 3

[0015] Example 3: The oxidation reaction of toluene was carried out in a 500mL reactor, and 140g of toluene, 0.45g of sodium chloride, 0.7g of cobalt bromide, 0.1g of copper nitrate trihydrate and 14g of benzoic acid were added, and the top of the kettle was sealed and heated to 140°C , react with oxygen, the reaction temperature rises to 150°C and is controlled to react at this temperature, the reaction pressure is 1.0 MPa, and the reaction time is 60 minutes. After the reaction, the reaction system was lowered to room temperature, the lid of the kettle was opened, and samples were taken for analysis. Analysis method is with embodiment 1. The reaction results are shown in Table 1.

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PUM

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Abstract

Disclosed is a process for synthesizing benzaldehyde by selective oxidation of toluene, wherein the catalyst mainly comprises manganese, copper, cobalt, ferrum, nickel, zirconium, zinc, Argentine or / and halides of sodium, calcium, potassium, nitrates, sulfates, acetates, benzoates. The preparing process comprises letting in oxygen at the presence of the catalyst. When the conversion rate of toluene is 10%, the selectivity of benzaldehyde is 62%, the selectivity of benzoic alcohol is 14%, the selectivity of benzene carbonic acid is 22%, when the conversion rate of toluene is 39%, the selectivity of benzaldehyde is 20%, the selectivity of benzoic alcohol is 5%, the selectivity of benzene carbonic acid is 73%.

Description

technical field [0001] The invention relates to a method for selectively oxidizing toluene to synthesize benzaldehyde under mild conditions. Background technique [0002] Both benzaldehyde and benzoic acid are important chemical raw materials. Benzaldehyde is an important intermediate of important food additives, synthetic drugs and spices, etc. Benzoic acid is an important intermediate in the synthesis of caprolactam. [0003] The preparation methods of benzoic acid include toluene chlorination hydrolysis (US 4229379; US 4450298), electrochemical oxidation of toluene and catalytic oxidation of toluene, among which the catalytic oxidation of toluene is the most studied. Cobalt and bromide are often used as catalysts in industry, the reaction temperature is 160°C, the catalyst concentration is 60-100ppm, the conversion rate of toluene is 15%, the selectivity of benzoic acid is 90%, and the selectivity of benzaldehyde is 3-5%. . The method encounters problems such as catal...

Claims

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Application Information

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IPC IPC(8): C07C45/36C07C47/54
Inventor 徐杰王峰李晓强周利鹏高进
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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