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Method for preparing iso-propylaniline by novel hydrogenation technology

A technology of isopropylaniline and isopropyl, which is applied in the field of preparing isopropylaniline by novel hydrogenation technology, can solve the problems of cumbersome operation steps, high safety hazard, long reaction time and the like, and achieves high heat and mass transfer coefficient, The effect of saving production cost and simple processing

Active Publication Date: 2021-03-02
西安联众安科化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing catalytic hydrogenation reduction process of isopropylnitrobenzene at home and abroad all adopts the high-pressure batch hydrogenation process technology, which has many problems such as cumbersome operation steps, long reaction time, large liquid holding capacity, and high safety hazards.

Method used

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  • Method for preparing iso-propylaniline by novel hydrogenation technology
  • Method for preparing iso-propylaniline by novel hydrogenation technology
  • Method for preparing iso-propylaniline by novel hydrogenation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Crack isopropyl nitrobenzene 80kg / h with methanol to transport H with isopropyl nitrobenzene delivery pump 2 64NM 3 / h After being mixed in the slit vortex pre-reactor, it is transported to the millimeter-tube fixed-bed hydrogenation reactor for hydrogenation reaction;

[0048] 2) Control the reaction temperature at 90°C and the reaction pressure at about 2MPa;

[0049] 3) The hydrogenation product after hydrogenation goes to the gas-liquid separation tank, and the exhaust gas after gas-liquid separation is sent to the combustion furnace, and the cumene mixture of the separated gas enters the product rectification tower for separation.

[0050] The conversion rate of hydrogenation reduction was 100% through chromatographic analysis.

Embodiment 2

[0052]1) Crack isopropyl nitrobenzene 120kg / h with methanol to transport H with isopropyl nitrobenzene delivery pump 2 96NM 3 / h is mixed in the slit vortex pre-reactor and then sent to the mm tube fixed-bed hydrogenation reactor (see the attached Figure 4 , 5 Shown, wherein 5 is millimeter tube)), carry out hydrogenation reaction;

[0053] 2) Control the reaction temperature at 85°C and the reaction pressure at about 2.5MPa;

[0054] 3) The hydrogenation product after hydrogenation goes to the gas-liquid separation tank, and the exhaust gas after gas-liquid separation is sent to the combustion furnace, and the cumene mixture of the separated gas enters the product rectification tower for separation.

[0055] The conversion rate of hydrogenation reduction was 100% through chromatographic analysis.

Embodiment 3

[0057] 1) Crack isopropyl nitrobenzene 150kg / h with methanol to transport H with isopropyl nitrobenzene delivery pump 2 300NM 3 / h is mixed in the slit vortex pre-reactor and then transported to the millimeter plate hydrogenation reactor (see the attached Image 6 , 7 As shown, wherein 6 is the reactor main body, 7 is the material port, and 8 is the heat exchange port), carrying out the hydrogenation reaction;

[0058] 2) Control the reaction temperature at 90°C and the reaction pressure at about 2MPa;

[0059] 3) The hydrogenation product after hydrogenation goes to the gas-liquid separation tank, and the exhaust gas after gas-liquid separation is sent to the combustion furnace, and the cumene mixture of the separated gas enters the product rectification tower for separation.

[0060] The conversion rate of hydrogenation reduction was 100% through chromatographic analysis.

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Abstract

The invention provides a method for preparing iso-propylaniline by a novel hydrogenation technology. The method comprises the following steps of 1, sequentially putting isopropyl nitrobenzene and H2 conveyed through methanol cracking into a slit vortex gas-liquid mixer for mixing; 2, feeding a formed mixture into a millimeter hydrogenation reactor filled with a catalyst, and carrying out a hydrogenation reaction; and 3, putting the hydrogenated product into a gas-liquid separation tank, sending waste gas into a combustion furnace, and separating the iso-propylaniline mixture in a product rectifying tower to obtain the product iso-propylaniline. According to a millimeter tubular fixed bed hydrogenation reactor, a millimeter plate type hydrogenation reactor and a millimeter plate fin type hydrogenation reactor, due to the fact that the distance between tubes and plates is small, the heat and mass transfer boundary layer is smaller than 1 mm, the interphase heat and mass transfer area islarge, and the heat and mass transfer coefficient is high. According to the process, solvent-free hydrogenation is adopted, compared with an existing process, the steps of product desolvation and solvent circulation are omitted, energy consumption is reduced, and production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry; in particular, it relates to a method for preparing cumene by novel hydrogenation technology. Background technique [0002] Isopropylaniline is an important intermediate in organic synthesis. Its main use is as an intermediate in the synthesis of the high-efficiency chemical herbicide isoproturon, and it can also be used in the synthesis of medicines, dyes, paints and other chemical products. With the continuous increase of demand for cumene in domestic and foreign markets, and the continuous expansion of the use of this product, the development of synthetic technology for cumene has a very broad market prospect. [0003] At present, the main method of producing cumene at home and abroad is the nitration reduction method of cumene. According to different reduction methods, it can be divided into cumene nitration-iron powder reduction method and cumene nitration-catalytic hydrogenation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/45C07C209/36
CPCC07C209/36C07C211/45
Inventor 薛群翔曹彬吴卫涛
Owner 西安联众安科化工有限公司
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