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Production and preparation method of 2-methyl-6-isopropyl aniline

A technology of cumene and cumene, which is applied in the field of production and preparation of 2-methyl-6-isopropylaniline, can solve the problems of slow production speed and high loss of raw materials, and reduce input cost and utilization rate High efficiency and high process production efficiency

Inactive Publication Date: 2021-05-07
HUAIAN SHUANGYANG CHEM
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Problems solved by technology

[0004] However, the traditional process has slow production speed and low efficiency in the production process, and the loss of raw materials is large

Method used

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Embodiment 1

[0015] The invention provides a technical solution: a production and preparation method of 2-methyl-6-isopropylaniline, which uses cumene as a starting material, nitrates it with mixed acid, and then carries out atmospheric pressure catalytic hydrogenation. The hydrogenation reaction uses Cu / SiO2 as the catalyst, the reaction temperature is 290-310°C, the contact time is 0.31-0.34s, the space velocity of the nitro is 0.23h-1, the selectivity of p-cymene is about 95%, and the nitro is converted The rate is over 99%.

[0016] Preferably, the mixed acid nitration requires constant stirring, thereby speeding up the reaction.

[0017] Preferably, the purity of the hydrogen needs to be guaranteed during the hydrogenation process, and the purity must be greater than 99%.

[0018] Preferably, electric heating is used for heating during the process of adding the catalyst.

[0019] Preferably, the Cu / SiO2 catalyst needs to be fully mixed with the mixture during the addition.

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Abstract

The invention discloses a production and preparation method of 2-methyl-6-isopropyl aniline, which comprises the following steps: taking isopropyl benzene as an initial raw material, nitrating with mixed acid, and then carrying out normal-pressure catalytic hydrogenation. Cu / SiO2 is used as a catalyst in the hydrogenation reaction, the reaction temperature is 290-310 DEG C, the contact time is 0.31-0.34 s, the airspeed of a nitro compound is 0.23 h<-1>, the selectivity of the p-isopropyl aniline is about 95%, and the conversion rate of the nitro compound reaches 99% or above. Compared with the prior art, the method has the beneficial effects that the novel process is high in production efficiency, the utilization rate of raw materials is high, and the input cost of the raw materials can be reduced for enterprises.

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-6-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): C07C209/36C07C211/47C07C201/08C07C205/06
CPCC07C201/08C07C209/36C07C205/06C07C211/47
Inventor 林瑜琨马俊
Owner HUAIAN SHUANGYANG CHEM
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