Preparation method of 2, 6-diethylaniline

A technology for the preparation of diethylaniline and its preparation process, which is applied in the preparation of amino compounds from amines and organic chemistry. It can solve the problems of high energy consumption, large amount of solid waste, and increased equipment investment, and achieve low energy consumption and low cost. Effect

Inactive Publication Date: 2018-03-13
HUAIAN SHUANGYANG CHEM
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  • Abstract
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Problems solved by technology

[0003] This production process produces a large amount of solid waste, which reaches 100KG per ton of product. This process requires hydrolysis to increase equipment investment. The hydrolysis process will generate a lar

Method used

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Examples

Experimental program
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Embodiment 1

[0015] The preparation technology of 2,6-diethylaniline comprises the following steps:

[0016] 1) Preparation of catalyst complex: Add aniline and catalyst triethylaluminum in a molar ratio of 3:1 to the evaporation kettle, the reaction temperature is 160°C, after 1.5 hours of reaction, the temperature is lowered to 100°C, and then the evaporation is started The kettle vent valve reduces the pressure to 0.1MPa;

[0017] 2) Alkylation reaction: After mixing the catalyst complex prepared in step 1) with the raw material aniline in a mass ratio of 1:12.5, pump it into the synthesis kettle with a pump, raise the temperature to 310°C, and pressurize at 4.6-5.0MPa. Add ethylene to carry out the alkylation reaction. After the reaction is over, stop heating and lower the temperature to 120°C;

[0018] 3) Press the material in the synthesis kettle into the evaporation kettle, then recover ethylene in the synthesis kettle and the evaporation kettle, reduce the vacuum to below -0.098MP...

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Abstract

The invention discloses a preparation method of 2, 6-diethylaniline. The preparation method comprises preparation of a catalyst complex, alkylation reaction, recovery and separation. The preparation method utilizes an alkyl aluminum complex as a catalyst. Alkyl aluminum can react with raw materials at the normal temperature so that energy consumption is low. Alkyl aluminum can be recycled. The preparation method is free of a washing process, does not produce waste water and reduces the solid waste amount by about 90% per ton than the waste amount based on aluminum powder and aluminum chlorideas catalysts. Alkyl aluminum has no corrosivity. The preparation device is prepared from carbon steel with a low cost.

Description

technical field [0001] The invention belongs to the field of compound preparation, and in particular relates to a preparation process of 2,6-diethylaniline. Background technique [0002] In the prior art, the preparation of 2,6-diethylaniline is to adopt the reaction of aniline and aluminum powder to produce aluminum aniline, then carry out an alkylation reaction to generate aluminum o-ethylaniline, and after the material is cooled, a hydrolysis reaction occurs to finally generate DEA (2 , 6-diethylaniline) crude product and aluminum hydroxide precipitation. [0003] This production process produces a large amount of solid waste, which reaches 100KG per ton of product. This process requires hydrolysis to increase equipment investment. The hydrolysis process will generate a large amount of waste water. The environmental protection waste water needs to be treated, which has a great impact on the factory environment. The preparation process requires high temperature and energy....

Claims

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Application Information

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IPC IPC(8): C07C209/68C07C211/45
Inventor 林瑜琨
Owner HUAIAN SHUANGYANG CHEM
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