Method and device for preparing 3,4-dichloroaniline without solvent

Abstract

The invention belongs to the field of chemical processing, and particularly discloses a method and a device for preparing 3,4-dichloroaniline without solvent. The method includes using 3,4-dichloronitrobenzene as a raw material, adding an assistant and a novel catalyst into the 3,4-dichloronitrobenzene, feeding hydrogen into a hydrogenation kettle to react continuously under certain pressure and at certain temperature, and collecting reacted hydrogenated liquid into a hydrogenated liquid tank via a filter; and blowing a filtered catalyst into the hydrogenation kettle to be reused via the filter. The method and the device have the advantages that a process is simple in operation, production cost is low, automatic control degree is high, yield of product is also high, quality is good, side reaction is little, reaction conditions are moderate, security is guaranteed, labor intensity of workers is low, and the method and the device are suitable for wide popularization and application.

Description

(1) Technical field [0001] The invention belongs to the field of chemical production, in particular to a method and device for producing 3,4-dichloroaniline without solvent. (2) Background technology [0002] With the reform and opening up and the rapid development of the national economy, the fine chemical industries such as medicine, fuel, pesticide, and daily chemical industry have ranked among the world's major countries in terms of scale and quantity, but there is still a large gap between the technical level and the developed countries, and the product quality is not high. , high material consumption and energy consumption, especially the imperfect treatment of three wastes, seriously restricts the further development of fine chemicals. In recent years, my country's catalytic hydrogenation technology has made major breakthroughs in technology development and promotion. Catalytic hydrogenation technology has not only been widely used in petrochemicals and petroleum ...

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Problems solved by technology

[0003] At present, in the production of aniline, many enterprises in my country still generally adopt reduction methods such as iron powder, alkali sulfide, hydrazine hydrate and hydrogenation reduction method in the 1950s and 1960s to organize production. The former is gradually eliminated due to serious pollution, and the latter has relatively advanced production technology. , but use methanol etc. as a solvent during the reaction process, it is necessary to add nitro substances dropwise, and the reaction effect is controlled by the reaction color. The phenomenon that the reaction effect is often affected by the color judgment is not allowed, which affects the increase of the load of the single kettle; in addition, there is methanol in the reaction kettle , Hydrogen exists and the operating safety factor increases when the operating pressure is above 1.0Mpa. After the reaction, the hydrogenation liquid needs to be extracted from the rectification tower, resulting in an increase in consumption costs

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