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A kind of method that improves the synthetic diphenylamine conversion rate of aniline

A diphenylamine conversion rate, aniline technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve problems such as low conversion rate of diphenylamine, and achieve the improvement of aniline conversion rate, increase conversion rate, and increase economy. sexual effect

Active Publication Date: 2021-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the low conversion rate of diphenylamine from aniline in the prior art, the present invention provides a production method that couples the reaction of synthesizing diphenylamine from aniline and synthesizing isopropylamine from isopropanol, which not only improves the efficiency of synthesizing diphenylamine from aniline. The conversion rate of isopropanol is also used to synthesize isopropylamine, which eliminates the ammonia generated by the synthesis of diphenylamine from aniline and reduces environmental pollution.

Method used

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  • A kind of method that improves the synthetic diphenylamine conversion rate of aniline
  • A kind of method that improves the synthetic diphenylamine conversion rate of aniline
  • A kind of method that improves the synthetic diphenylamine conversion rate of aniline

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Embodiment 1

[0029]Preparation of the catalyst: The catalyst used in the experiment was a catalyst composed of β zeolite, activated alumina and alkali metals. The specific preparation method is as follows:

[0030](1) Take 200gHβ zeolite (SiO2 / Al2O3The molecular ratio is 28) and 1500 mL (0.1 mol / L) potassium chloride aqueous solution are placed in a 2000 mL four-neck flask with a stirrer for ion exchange. The exchange reaction temperature is 75°C, the stirring speed is 200n / min, and the time is 5.0h. Afterwards, the exchanged zeolite and potassium aqueous solution are filtered, washed, and dried; the washing process is: washing until there is no chlorine. The drying process is: drying at 60°C for 4.0 hours, and drying at 110°C for 4.0 hours.

[0031](2) Mix 70g of the above-mentioned exchanged zeolite with 10g of aluminum hydroxide powder, and add nitric acid and an appropriate amount of deionized water. The added amount of nitric acid accounts for 0.5wt% of the dry material. After kneading on an extr...

Embodiment 2~4

[0033]A fixed-bed reactor was used, the catalyst prepared in Example 1 was used, and 200 mL of the catalyst was taken and put into a stainless steel reactor with an inner diameter of 25 mm and a length of 1200 mm. The purity of the reaction raw material aniline>99%, purity of isopropanol>99%. The bottom feed method is adopted to pass aniline and isopropanol into the reactor at the same time. The synthesis reaction is carried out under different reaction temperature, pressure and feed space velocity. The reaction product flows out from the top of the reactor and enters the separator after cooling in. The composition was analyzed by gas chromatography, and the specific reaction conditions and results are shown in Table 1.

[0034]Table 1. Reaction conditions and results of Examples 2 to 4

[0035]

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Abstract

The invention discloses a method for improving the conversion rate of aniline in synthesis of diphenylamine. The method comprises the following steps: simultaneously introducing aniline and isopropanol into a reactor according to a ratio of 1: (0.4-0.6), and carrying out a reaction under catalysis of a beta zeolite molecular sieve, wherein the concrete reaction conditions are as follows: the reaction pressure is 1.5 to 6.0 MPa; the reaction temperature is 250 to 300 DEG C; and the volume space velocity of aniline is 0.1 h-1 to 0.5 h-1. According to the invention, through selecting a proper catalyst and optimizing reaction conditions, and on the basis of guaranteeing the reaction of synthesizing diphenylamine from aniline, the reaction of synthesizing isopropylamine from isopropanol can be performed in a certain extent, so two reactions are coupled, and the effects of improving the conversion rate of aniline and eliminating environmental pollution are achieved. Combined production of isopropylamine can be realized on an original device used for synthesizing diphenylamine from aniline, so the economy of the device is increased; and separation of an obtained product can be completed through conventional rectification, and industrial practical values are obtained.

Description

Technical field[0001]The invention relates to a method for improving the conversion rate of diphenylamine synthesized from aniline, and belongs to the field of chemical synthesis technology.Background technique[0002]Diphenylamine (N-phenylaniline), also known as N-phenylaniline, is a very versatile chemical raw material. In the rubber industry, it is mainly used as a raw material for rubber antioxidants, or rubber antioxidants, such as the production of antioxidants BLE, RT Peis (4-aminodiphenylamine), and vulcanized new blue BBF1And other raw materials, but also SO3And the stabilizer of explosives, synthetic veterinary drugs, fruit preservatives and other raw materials.[0003]With the rapid economic development after my country’s entry into the WTO, my country’s tire industry has also seen unprecedented rapid development. At present, more than 20 sets of radial tire production lines have been introduced, and many of its technical software require the use of antioxidant 4020 to ensur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/55C07C209/02C07C211/06C07C209/16B01J29/70
CPCB01J29/7007C07C209/02C07C209/16C07C211/55C07C211/06
Inventor 祁文博艾抚宾徐彤袁毅乔凯
Owner CHINA PETROLEUM & CHEM CORP
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