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A kind of preparation method of dinitrobenzene continuous catalytic hydrogenation for the preparation of phenylenediamine

A technology of catalytic hydrogenation and dinitrobenzene, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of amino compounds, etc., can solve the problems of pollution and low recovery efficiency of catalysts, and reduce pollution and harm to the human body Harmful, efficient collection effect

Active Publication Date: 2022-03-11
上海鸿源鑫创材料科技有限公司
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Problems solved by technology

[0003] The invention provides a method for the continuous catalytic hydrogenation of dinitrobenzene for the preparation of phenylenediamine, aiming to solve the problems of low catalyst recovery efficiency and easy pollution

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  • A kind of preparation method of dinitrobenzene continuous catalytic hydrogenation for the preparation of phenylenediamine
  • A kind of preparation method of dinitrobenzene continuous catalytic hydrogenation for the preparation of phenylenediamine
  • A kind of preparation method of dinitrobenzene continuous catalytic hydrogenation for the preparation of phenylenediamine

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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] see Figure 1-4 , the present invention provides a technical solution: a preparation method for continuous catalytic hydrogenation of dinitrobenzene for the preparation of phenylenediamine, which uses a phenylenediamine preparation device to realize the preparation of phenylenediamine, characterized in that: phenylenediamine The amine preparation device includes a preparation component 1 , a recovery component 2 and a purification component 3 .

[0026] The preparation component 1 includes: a hydrogenation reactor 101, a maturation reactor 102, a multi-stage settling tank 103 and a rectific...

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Abstract

The present invention is applicable to the technical field of phenylenediamine preparation, and provides a preparation method for continuous catalytic hydrogenation of dinitrobenzene for the preparation of phenylenediamine, which uses a phenylenediamine preparation device to realize the preparation of phenylenediamine. The phenylenediamine preparation device includes a preparation assembly, a recovery assembly and a purification assembly, the preparation assembly includes a hydrogenation reactor, a maturation tank, a multistage settling tank and a rectification tower, and the recovery assembly includes a recovery box, a reflux pipe, a feed Bucket, first filter screen, second filter screen, air pump, leaking liquid funnel, liquid outlet valve, return pump, controller, timer, inlet pipe and air valve, the purification assembly includes purification box, communication pipe, shunt pipe , exhaust pipe, air hole, by setting the recovery box for recovering the catalyst, also being provided with an air pump for drying the catalyst and a purification box for purifying the gas extracted by the air pump, the present invention has the advantages of high catalyst recovery efficiency and environmental protection The characteristics of little pollution.

Description

technical field [0001] The invention belongs to the field of preparation of phenylenediamine, and in particular relates to a preparation method of continuous catalytic hydrogenation of dinitrobenzene for the preparation of phenylenediamine. Background technique [0002] In the prior art, the preparation of phenylenediamine generally adopts equipment such as hydrogenation reactor, maturation kettle, multi-stage settling tank, filter device, rectification tower, etc., and the catalyst used in this method is skeleton nickel, carrier nickel or palladium carbon , although these catalysts can be recycled after being separated by multi-stage settling tanks, after the catalysts are separated from multi-stage settling tanks, there is still phenylenediamine solution on the surface. At this time, the catalysts need to be dried to facilitate collection. It is more troublesome in the process, the recovery efficiency is low, it will pollute the environment, affect the health of the operat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C209/36C07C209/86C07C211/51
CPCC07C209/36C07C209/86C07C211/51Y02P20/584
Inventor 苏建军张玉宝吴中礼
Owner 上海鸿源鑫创材料科技有限公司
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