Method for extracting 2,6-dimethylphenol from crude phenol and device applied to method

Abstract

The invention discloses a method for extracting 2,6-dimethylphenol from crude phenol and a device applied to the method. A two-stage distillation technology is adopted for the method, primary distillation treatment is performed on crude phenol firstly to remove light components lighter than 2,6-dimethylphenol, the light components are prevented from affecting the effect of follow-up secondary distillation treatment, and product yield and quality of 2,6-dimethylphenol are improved; then secondary distillation treatment under specific operation conditions is performed, especially, the operationpressure of the secondary distillation treatment is controlled to be not higher than 5 KPa, so that on one hand, the relative volatility of 2,6-dimethylphenol and other components in a primary distillation product is improved and high-concentration 2,6-dimethylphenol can be obtained by extraction, on the other hand, 2,6-dimethylphenol cannot have an isomerism change in the distillation processes,and the 2,6-dimethylphenol separation effect is guaranteed. Tests prove that the yield of 2,6-dimethylphenol is as high as 99.98%, and the purity is as high as 99.9%.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a method and device for extracting 2,6-xylenol from crude phenol, in particular to a method for extracting 2,6-xylenol from crude meta-p-cresol Method and device thereof. Background technique [0002] 2,6-Xylenol is an important chemical raw material and fine chemical intermediate, which can be used in the production of polyphenylene ether resins, photographic chemicals, pesticides, polyester and polyether resins, and can also be used as raw materials for antiarrhythmic drugs. The amount of 2,6-xylenol in nature is very small. At present, the synthesis method is mainly used to obtain 2,6-xylenol. Metal oxides such as magnesium oxide are often used as catalysts, which need to be reacted at high temperature and have high selectivity. Not strong, and a larger proportion of para-products will be produced at the same time. [0003] The crude phenol extracte...

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Problems solved by technology

The amount of 2,6-xylenol in nature is very small. At present, the synthesis method is mainly used to obtain 2,6-xylenol. Metal oxides such as magnesium oxide are often used as catalysts, which need to be reacted at high temperature and have high selectivity. Not strong, and will produce a large proportion of para-products at the same time

[0004] Although the above-mentioned technology separates m-p-cresol and xylenol, in the separation process, multiple isomers of xylenol occur, such as 3,5-xylenol, 2,6-xylenol, 2 , 5-xylenol and 2,4-xylenol, etc., the final xylenol obtained is also crude xylenol, even if subsequent rectification and recrystallization are used in conjunction, it is difficult to obtain the Extract high-purity 2,6-xylenol from the crude xylenol of isomers, so the above-mentioned technology is difficult to directly separate high-purity 2,6-xylenol from crude phenol

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