Method and device for continuously producing m-aminophenol

An aminophenol and production room technology, which is applied in the field of continuous production of m-aminophenol, can solve the problems of high requirements for workers' operating skills, difficult alkali-melting operation, and easy occurrence of flushing, etc., and achieves good heat transfer effect and avoids flushing. Temperature phenomenon, the effect of precise temperature control

Active Publication Date: 2019-09-27
HEBEI JIANXIN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of dropping sodium salt and keeping warm, because the reaction system is large and a large amount of heat is released during the reaction process, it is easy to cause temperature flushing, which makes the operation of alkali fusion difficult, so the requirements for workers' operation skills are relatively high.
In the alkali fusion process, when the temperature is higher than 310°C, ethers are easily formed, resulting in increased side reactions, so the current yield of m-aminophenol is generally only about 80%.

Method used

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  • Method and device for continuously producing m-aminophenol

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Effect test

Embodiment 1

[0030] The schematic diagram of the production device for continuous production of m-aminophenol is as follows: figure 1 As shown, 360kg of sodium m-sulfamic acid (after conversion), 154kg of sodium hydroxide and 160kg of potassium hydroxide are sequentially put into the batching tank 1, stirred, and the temperature is raised to 250°C by feeding low-temperature heat transfer oil. Continuously discharge the material into the heating spiral pipe reactor 2, raise the temperature to 300°C, and the heating time is 1.0h. Then, the materials were continuously discharged into the thermal insulation spiral pipe reactor 3 by using a double auger, and kept at 300° C. for 1.0 h. After the heat preservation is over, use the duplex auger to push the material into the dilution tank 4 for dilution, and then obtain 183.3kg of m-aminophenol crude product after desalination, acid precipitation and purification, with a yield of 91.19%, and its m-aminophenol content GC test is 99.70%.

Embodiment 2

[0032] The schematic diagram of the production device for continuous production of m-aminophenol is as follows: figure 1 As shown, put 360kg of sodium m-sulfamic acid (purified), 154kg of sodium hydroxide, and 160kg of potassium hydroxide into batching tank 1 in sequence, and heat up to 250°C with heat transfer oil while stirring. Continuously discharge the material into the heating spiral pipe reactor 2, raise the temperature to 300°C, and heat up for 2.0 hours. Then continuously feed into the thermal insulation spiral pipe reactor 3, and keep the temperature at 300°C for 2.0h. After the heat preservation is finished, push the material into the dilution tank 4 for dilution, and then obtain 180.2 kg of m-aminophenol crude product after desalination, acid analysis and purification, with a yield of 89.65%, and the m-aminophenol content is 99.68% by GC test.

Embodiment 3

[0034] The schematic diagram of the production device for continuous production of m-aminophenol is as follows: figure 1 As shown, put 360kg of sodium m-sulfamic acid (purified), 140kg of sodium hydroxide, and 145kg of potassium hydroxide into the batching tank 1 in sequence, and heat up to 250°C with heat transfer oil while stirring. Continuously discharge the material into the heating spiral pipe reactor 2, raise the temperature to 300°C, and heat up for 2.0 hours. Then continuously feed into the thermal insulation spiral pipe reactor 3, and keep the temperature at 300°C for 2.0h. After the heat preservation is completed, push the material into the dilution tank 4 for dilution, and then obtain 179.5 kg of m-aminophenol crude product after desalination, acid analysis and purification, with a yield of 89.30%, and its m-aminophenol content is 99.75% by GC test.

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Abstract

A method for continuously producing m-aminophenol is implemented to produce the m-aminophenol through alkali fusion continuous reaction and specifically includes the production steps of preparing materials, wherein a sodium m-sulfamate solution and a strong base are sequentially added into a material preparing tank according to a certain ratio, and stirring and heating are conducted; conducting heating reaction, wherein the materials in the material preparing tank are continuously discharged into a heating spiral pipeline reactor, and heating reaction is conducted for a certain period of time; conducting heat preserving, wherein the materials are pushed into the heating spiral pipeline reactor through the heating spiral pipeline reactor, and heat preserving is conducted at 280-310 DEG C for a certain period of time; conducting diluting, wherein qualifiedly-diluted materials at the bottom of an impregnation and dilution tank are transferred to the subsequent process section for subsequent processing to obtain a crude m-aminophenol product. Continuous feeding, heating, heat preserving and continuous discharging are realized, the continuity of alkali fusion and the precision of temperature control in the production process of the m-aminophenol are realized, the operation intensity of alkali fusion is relieved, the requirement for the operation level of workers is lowered, and production efficiency is improved.

Description

technical field [0001] The invention relates to a method and device for continuous production of m-aminophenol, belonging to the technical field of chemical production. Background technique [0002] m-Aminophenol is an important organic intermediate with a wide range of uses. It can be used as a catalyst in medicine, dye industry and organic chemical reactions, as a metal anti-corrosion agent in alkaline media, and can also be used in the production of antioxidants, stabilizers, and developers. Wait. [0003] The traditional production method of m-aminophenol is nitrobenzene sulfonation alkali fusion method. With the advancement of science and technology, through the continuous exploration and efforts of domestic and foreign scientific and technological personnel, a variety of synthetic routes have been developed, such as sodium m-sulfamate alkali fusion method, m-nitrophenol electrolysis method, m-phenylenediamine hydrolysis method, Resorcinol ammoniation method, aniline ...

Claims

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Application Information

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IPC IPC(8): C07C215/76C07C213/00B01F13/10B01J19/00B01J19/20B01J19/18
CPCC07C213/00B01J19/0053B01J19/0066B01J19/20B01J19/1818B01J19/1831B01J19/0013B01F33/821C07C215/76
Inventor 刘佳伟朱秀全张培恒张静
Owner HEBEI JIANXIN CHEM IND CO LTD
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