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 r

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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