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Method of preparing o-anisidine and p-anisidine through hydrogenation reduction of mixture of o-nitroanisole and p-nitroanisole

A technology for p-nitroanisole and p-aminoanisole, which is applied in the field of preparation of o-anisole and p-aminoanisole, can solve the problems of a large amount of process waste water, material loss, and high energy consumption, and achieves a high technological The effect of clean process, high conversion rate and less pollution of three wastes

Inactive Publication Date: 2013-05-01
CHANGZHOU JIASEN CHEM
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Problems solved by technology

[0003] The technical problem to be solved in the present invention is: in order to solve the shortcomings of high energy consumption and high cost in the existing production process of p-aminoanisole and o-aminoanisole, and a large amount of process wastewater will be produced in the pretreatment process, causing serious The technical problem of environmental pollution and loss of material, the present invention provides a kind of method of preparing o-aminoanisole and p-aminoanisole by hydrogenation reduction of o-nitroanisole and p-nitroanisole mixture, the The method has a simple process and high conversion rate; the process is clean and environmentally friendly; the three wastes are less polluted

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  • Method of preparing o-anisidine and p-anisidine through hydrogenation reduction of mixture of o-nitroanisole and p-nitroanisole

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Embodiment

[0025] The present invention will be further described with reference to the following examples, but it should be understood that these examples are for illustrative purposes only and should not be construed as limitations on the implementation of the present invention.

[0026] The invention uses o-nitroanisole and p-nitroanisole as raw materials, uses Pt / C as a catalyst for hydrogenation reduction in a methanol system, and prepares o-aminoanisole and p-aminoanisole. The process is as follows:

[0027] (1) Catalytic hydrogenation

[0028] Using methanol as solvent, o- and p-nitroanisole as raw material, add 10% Pt / C catalyst, replace with nitrogen, control the reaction temperature at 40°C, operating pressure 0.4Mpa, feed high-purity hydrogen, and react 7 hours.

[0029] (2) Recovery of catalyst

[0030] The above-mentioned reacted material is pumped into the filter to recover the catalyst. The recovered catalyst can be recycled. The liquid phase enters the next process. ...

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Abstract

The invention relates to a method of preparing o-anisidine and p-anisidine through hydrogenation reduction of a mixture of o-nitroanisole and p-nitroanisole. According to the method, o-nitroanisole and p-nitroanisole are used as raw materials, and o-anisidine and p-anisidine are prepared in a methanol system through hydrogenation reduction with Pt / C as a catalyst. With the method provided by the invention, the disadvantages of high energy consumption and high cost in conventional production process of o-anisidine and p-anisidine are overcome, and the technical problems of severe environmental pollution and loss of materials caused by considerable process waste water generated in the process of pretreatment in conventional production process are overcome; the method provided by the invention has the advantages of easiness, a high conversion rate, clean, green and environment-friendly process and a small amount of pollution by three wastes.

Description

technical field [0001] The invention relates to the technical field of preparation methods of o-aminoanisole and p-aminoanisole, in particular to a method for preparing o-aminoanisole and p-aminoanisole by hydrogenation reduction of a mixture of o-nitroanisole and p-nitroanisole The aminoanisole method. Background technique [0002] P-aminoanisole and o-aminoanisole are important organic intermediates. At present, the process adopted for the preparation of p-aminoanisole and o-aminoanisole is to use p-nitroanisole and o-nitroanisole as raw materials respectively, undergo reduction, and then separate and refine them. Usually the preparation of p-aminoanisole, o-aminoanisole and aniline is an independent preparation process and separation and refining process respectively. This traditional preparation process has the following disadvantages: since the preparation is based on a single component as a raw material, it needs The mixed raw materials are pre-treated in advance to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/02C07C217/84
CPCY02P20/584
Inventor 李时斌刘旭冉
Owner CHANGZHOU JIASEN CHEM
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