Clean recovery method of toluene oxidation catalyst

An oxidation process and recovery method technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of reducing the steps of catalyst recovery, easy to be oxidized, etc., to achieve good recycling effect, Less by-products and less pollution

Inactive Publication Date: 2013-08-14
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention first uses cyclohexane extraction to separate the reaction product from the catalyst, effectively solving the problem that benzaldehyde is easily oxidized due to coexistence with the catalyst in the separation process. Formic acid can promote the generation of peroxy radic

Method used

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  • Clean recovery method of toluene oxidation catalyst
  • Clean recovery method of toluene oxidation catalyst

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Embodiment 1

[0016] Embodiment 1: After the toluene oxidation reaction is completed in reactor 1, enter extraction separator 2 through material delivery pipeline 7, add the hexanaphthene of 3-20 times initial toluene volume in extraction separator 2, hexanaphthene as The extractant extracts the reactant toluene and the products benzaldehyde, benzoic acid and benzyl alcohol, acetic acid will also be brought into it, and the organic phase is separated from the water phase through the separator 2, and the organic phase enters the rectification tower 4 through the pipeline 10 for separation , the water phase enters the distillation tower 3 through the pipeline 8, the water is distilled out under normal pressure, and the water is discharged through the pipeline 12. The catalyst that contains a small amount of benzoic acid can be added in the reactor through pipeline 9 and be recycled. In the rectifying tower 4, cyclohexane can be distilled out as the top product, and then input into the separat...

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Abstract

The invention discloses a recovery method for toluene oxidation production of benzaldehyde or a benzoic acid catalyst. The method is mainly characterized by comprising the following steps of: oxidizing toluene to produce benzaldehyde, benzyl alcohol and benzoic acid, and generating water in toluene oxidation reaction of taking cobalt, manganese and bromine as a catalytic system; firstly, extracting reactant toluene, and products benzaldehyde, benzoic acid and benzyl alcohol into cyclohexane by cyclohexane after the reaction is finished; separating an organic phase from a water phase containing the catalyst; separating the organic phase by rectification; firstly, separating all cyclohexane to feed to an extraction system; then separating acetic acid and toluene to feed to a reaction system; finally separating the product benzaldehyde and benzyl alcohol from benzoic acid; and feeding the catalyst containing a little of benzoic acid to the reaction system for directly carrying out next batch of toluene oxidation reaction after carrying out simple distillation to remove moisture by a water phase. The result shows that the recovered catalyst still has a good catalytic effect on toluene oxidation; and main product benzaldehyde is less in loss and high in yield in the separating process.

Description

Technical field: [0001] The invention relates to a method for preparing benzaldehyde and benzoic acid by oxidizing toluene. Background technique [0002] Traditional benzaldehyde and benzoic acid are prepared by chlorination and hydrolysis of toluene. In this method, toluene is first chlorinated with side methyl groups under light conditions to mainly generate a mixture of benzyl chloride, and then benzyl chloride is reacted in acidic or alkaline Under the conditions of hydrolysis and rectification, benzoic acid and benzaldehyde were obtained. The disadvantage of this method is that the reaction process is long and complicated, and the liquid Cl 2 It is easy to have safety hazards, it is difficult to remove Cl in the product, and it is difficult to apply the product in food additives. Benzaldehyde and benzoic acid prepared by the direct oxidation of toluene not only meet the requirements of food standards, but also are environmentally friendly. The main products of cobalt...

Claims

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Application Information

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IPC IPC(8): B01J27/138C07C47/54C07C45/80C07C63/06C07C51/48
Inventor 张锋张志炳颜久娟巫先坤孟为民
Owner NANJING UNIV
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