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Preparation method for preparation of phenylenediamine through dinitrobenzene continuous catalytic hydrogenation

A technology of dinitrobenzene and catalytic hydrogenation, applied in the preparation of organic compounds, chemical instruments and methods, preparation of amino compounds, etc., can solve the problems of pollution, low catalyst recovery efficiency, etc., to reduce pollution and reduce the impact on human body. Harm, waste reduction effect

Active Publication Date: 2019-11-12
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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  • Preparation method for preparation of phenylenediamine through dinitrobenzene continuous catalytic hydrogenation
  • Preparation method for preparation of phenylenediamine through dinitrobenzene continuous catalytic hydrogenation
  • Preparation method for preparation of phenylenediamine through dinitrobenzene continuous catalytic hydrogenation

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[0024] In order to make the object, technical solution and advantages of the present invention more clear, 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 recti...

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Abstract

The invention is applicable to the technical field of phenylenediamine preparation and provides a preparation method for preparation of phenylenediamine through dinitrobenzene continuous catalytic hydrogenation. Preparation of phenylenediamine is achieved by using a phenylenediamine preparation device, and the phenylenediamine preparation device comprises a preparation component, a recycling component and a purification component, wherein the preparation component comprises a hydrogenation reaction kettle, a maturing kettle, a multi-stage settling tank and a rectification tower; the recyclingcomponent comprises a recycling tank, a backflow tube, a feeding hopper, a first filter net, a second filter net, a gas sucking pump, a liquid leakage hopper, a liquid outlet valve, a backflow pump, acontroller, a timer, a gas inlet tube and a gas valve; and the purification component comprises a purification tank, a communicating tube, a diversion tube, an exhaust tube and a vent hole. Due to adoption of the recycling tank for recycling a catalyst, the gas sucking pump for drying the catalyst and the purification tank for purifying gases sucked out by using the gas sucking pump, the preparation method has the characteristics of being high in catalyst recycling efficiency and small in environment 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...

Claims

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Application Information

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Patent Type & Authority Applications(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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