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Production method of ortho-aminophenol

A technology of o-aminophenol and its production method, which is applied in the chemical industry and can solve problems such as low product yield and serious pollution

Pending Publication Date: 2022-03-15
LIAONING SHIXING PHARMA & CHEM
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  • Application Information

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Problems solved by technology

[0002] o-aminophenol: Chinese synonyms: 2-aminophenol, o-aminophenol, is an important dye intermediate, used in the manufacture of acid mordant blue R, sulfur yellow brown, etc., and can also be used as fur dyes and fluorescent whitening agents EB, etc.; In the cosmetics industry, it is used to make hair dyes (as a complex dye); in the pesticide industry, it is used as a raw material for the insecticide phossulfon, and it is also used for the determination of silver and tin and the determination of gold; currently, poly-o-nitrophenol is used Iron powder reduction method produces a large amount of iron sludge during production, causing serious pollution and low product yield

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  • Production method of ortho-aminophenol

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[0028] The present invention will be further described below in conjunction with the examples, the purpose is only to better understand the contents of the present invention, therefore, the examples given do not limit the protection scope of the present invention.

[0029] see figure 1 1. First mix and dissolve 60% ethanol and o-nitrophenol with a molar ratio of 1:0.5 through a pipeline mixer. The dissolved material is metered into the hydrogenation unit through the pump at a flow rate of 2500L / h, and the catalyst is added. The catalyst is modified Raney nickel, the main body is Ni, and the additives are Mo, Cr, Ti, Fe, Co, Cu, Mn , one or more of metal salts such as Ba, the amount added is 2% of the moles of Ni, and the amount of catalyst used is 0.05-20% of that of o-nitrophenol.

[0030] Open the hydrogen valve and the heated steam valve of the hydrogenation kettle, carry out heating, pressurized hydrogenation, and carry out continuous hydrogenation reaction in the presenc...

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Abstract

The invention relates to the technical field of chemical engineering, in particular to a production method of ortho-aminophenol. The method comprises the following steps: mixing and dissolving 60% ethanol and o-nitrophenol through a pipeline mixer; feeding the dissolved material into a hydrogenation device, adding a catalyst, heating, pressurizing and hydrogenating; the hydrogenation liquid which is qualified after a period of reaction enters a catalyst continuous settler, the supernatant liquid from the settler enters a ceramic membrane filtration system after being subjected to pressure reduction, and the supernatant liquid without the catalyst is sent to a continuous crystallizer; cooling and crystallizing the material through heat exchange of cooling water and chilled water; after the crystallization is finished, putting a crystallization solution into a centrifugal machine for solid-liquid separation; and drying the centrifuged wet product in a double-cone vacuum dryer to obtain the product. The method achieves the beneficial effects of solving the problems of pollution and low yield of an iron powder reduction method through the processes of hydrogenation reduction, crystallization, refining, drying and packaging.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method of o-aminophenol. Background technique [0002] o-aminophenol: Chinese synonyms: 2-aminophenol, o-aminophenol, is an important dye intermediate, used in the manufacture of acid mordant blue R, sulfur yellow brown, etc., and can also be used as fur dyes and fluorescent whitening agents EB, etc.; In the cosmetics industry, it is used to make hair dyes (as a complex dye); in the pesticide industry, it is used as a raw material for the insecticide phossulfon, and it is also used for the determination of silver and tin and the determination of gold; currently, poly-o-nitrophenol is used The iron powder reduction method produces a large amount of iron sludge in the production, which is seriously polluted and the product yield is low. Contents of the invention [0003] The present invention aims to solve the above problems, thereby providing a kind of pr...

Claims

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Application Information

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IPC IPC(8): C07C213/02C07C215/76C07C213/10
CPCC07C213/02C07C213/10C07C215/76
Inventor 王文勇石志刚梁新文高华维
Owner LIAONING SHIXING PHARMA & CHEM