Indole producing process

A technology for indole and indole fractions, applied in the field of coal chemical industry, can solve the problems of unsuitable industrialization conditions, complicated process, and difficult treatment of acid tar

Inactive Publication Date: 2007-06-06
ANGANG STEEL CO LTD
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Problems solved by technology

Solvent extraction is a relatively mature method for recovering indole, but the selectivity of the currently used extractant is still not ideal, resulting in the loss of the target product. At the same time, a large amount of solvent must be recovered for recycling, resulting in high production costs, especially in raw materials. The disadvantages are particularly prominent when the content of indole is low
[0007] 3. Acid polymerization method: use strong acid to react with indole in the washing oil to form indole low polymer, then deacidify, decompose the polymer, and refine indole again. The...

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Embodiment Construction

[0027] A method for producing indole, the method uses the residual oil (containing 20% ​​to 35% of indole) obtained after the production of β-methylnaphthalene as a raw material, puts the raw material into a rectifying still, and adds an entrainer (Ethylene glycol or diethylene glycol or diethylene glycol), the volume ratio of the raw material and the entrainer is 1:0.2~0.6, after heating, it passes through a rectification tower (the number of theoretical plates is 30~60) and is extracted by azeotropic distillation. Go out indole fraction (70%~80% of indole content); After the indole fraction is statically separated from the entrainer, the entrainer is recycled, and then a solvent (ethanol or ether or water) is added to the indole fraction, and the indole The entrainer remaining in the fraction is separated from indole (separation temperature is 20°C-30°C), the volume ratio of indole fraction to solvent is 1:1.5-3, and then crystallized (temperature is 15°C-25°C), centrifuged ...

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Abstract

The present invention relates to coal chemical technology, and is indole producing process. The residual oil from beta-methylnaphthalene and containing indole in about 30 % is used as material for producing indole through azeotropic rectification and washing crystallization. The production process includes azeotropic rectification to obtain indole fraction, water washing to eliminate azeotrope agent, re-crystallization in solvent and centrifuging to obtain indole product with content over 99 %.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, and relates to a method for producing indole. Background technique [0002] Indole is mainly used in agricultural chemistry, spices, medicine and dyes, such as the synthesis of plant growth hormones such as β-indole acetic acid; the synthesis of tryptophan is an amino acid necessary for animal growth, and can also be used as an anti-deficiency protein disease Gastric ulcer medicine, used as a fragrance retainer in the production of spices. [0003] The content of indole in coal tar is 0.1-0.2%, and it is mainly concentrated in the washing oil fraction. In our factory, it is mainly distributed in industrial methyl naphthalene, and the content is about 4%-6%. In the process of producing β-methylnaphthalene, we found that its residual oil contains about 30% indole, which is much higher than the indole content in industrial methylnaphthalene, creating condi...

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Application Information

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IPC IPC(8): C07D209/08C07D209/06B01D3/14
Inventor 李健马希博赵明姚君王萍王晓楠马晨阳
Owner ANGANG STEEL CO LTD
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