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Production and preparation method of 2-methyl-4-isopropylaniline

A technology for isopropylaniline and nitrocumene, which is applied in the field of production and preparation of 2-methyl-4-isopropylaniline, can solve problems such as damage to the environment, pollution, environmental pollution, etc., and achieves energy saving and environmental protection in production technology, low pollution effect

Inactive Publication Date: 2021-04-23
HUAIAN SHUANGYANG CHEM
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AI Technical Summary

Problems solved by technology

[0004] However, the existing production process will cause a lot of pollution to the environment during the production process, and the pollution is unavoidable, damaging the environment

Method used

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Embodiment 1

[0017] The invention provides a technical solution: a production and preparation method of 2-methyl-4-isopropylaniline, which uses cumene as a starting material and homogeneously nitrates it in a concentrated sulfuric acid medium to obtain a mixture of nitrocumene .

[0018] The reaction mixture is reduced and separated by iron powder to obtain p-cymeniline with a content ≥ 97%.

[0019] The nitration yield of this reaction is 72.4%, the reduction yield is 92.3%, the separation yield is 93.6%, and the total yield is 62.6%.

[0020] Preferably, the concentrated sulfuric acid needs to be uniformly added to the original raw material to ensure the flow stability of the addition.

[0021] Preferably, continuous heating is required during the nitrification process, thereby increasing the speed of nitrification.

[0022] Preferably, iron powder is used as the reduction catalyst, and the addition process should be fully stirred to make the reaction rapid and uniform.

[0023] Prefe...

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PUM

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Abstract

The invention discloses a production and preparation method of 2-methyl-4-isopropylaniline. The method comprises the following steps: using isopropyl benzene as a starting raw material, carrying out homogeneous nitrification in a concentrated sulfuric acid medium to obtain a nitroisopropyl benzene mixture; and reducing and separating the reaction mixture by iron powder to obtain p-isopropylaniline with the content of more than or equal to 97%. The nitration yield of the reaction is 72.4%, and the reduction yield is 92.3%; the separation yield is 93.6%, and the total yield is 62.6%. Compared with the prior art, the method has the beneficial effects that the novel production process is energy-saving, environment-friendly, small in environmental pollution and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production and preparation method of 2-methyl-4-isopropylaniline. Background technique [0002] P-cymeniline is a colorless liquid, soluble in organic solvents such as benzene. p-cymeniline is an alkyl-substituted aniline compound, also known as cumylamine, which is mainly used in the synthesis of chemical herbicide isoproturon, pesticide additives, medicines, materials (paints, dyes) and other pesticide chemicals. For the analysis of tungsten. [0003] In terms of industrial production, foreign countries such as the United States and Japan have successfully researched and developed the industrial production technology of p-cymene as early as the 1980s and used it to develop many series of products with special functions. At present, domestic p-cymeniline is mainly obtained from foreign imports, and there are not many reports on its production. With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/32C07C211/47C07C201/08C07C205/06
CPCC07C201/08C07C209/325C07C205/06C07C211/47
Inventor 林瑜琨马俊
Owner HUAIAN SHUANGYANG CHEM
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