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Synthesis process of 1,2,3-trimethoxy benzene

A kind of technology of trimethoxybenzene and synthesis process, applied in 1 field

Inactive Publication Date: 2008-07-16
湖北天新生物科技有限责任公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A kind of 1,2,3-trimethoxybenzene is a deep-processed product of gallnut, which can be used in the field of organic synthesis and pharmaceutical industry. At present, there is no method for producing pyrogallic acid in industry

Method used

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Embodiment Construction

[0004] In actual production, put 100 kg of pyrogallic acid (pyrogallic acid), 200 kg of water, and 2 kg of tetrabutylammonium bromide into the reaction kettle for stirring. After the mixture is evenly stirred, add sulfuric acid dropwise Dimethyl ester and industrial liquid caustic soda, and control the temperature at about 35°C. After the dropwise addition, keep the temperature for 3 hours, keep the temperature at 30°C, then raise the temperature to 95°C and keep it for 2 hours; when the material crystallizes, it needs to cool down to 20°C; After the temperature drops to 20°C, after the crystallization is completed, the crude product of 1,2,3-trimethoxybenzene is obtained by centrifugal dehydration; 100 kg of the crude product, 200 kg of ethanol, and 400 kg of water are put into the reactor for stirring, and the mixture is uniformly Finally, feed steam to heat up to 90°C, cool down to 5-10°C to crystallize after the material is completely dissolved, and centrifugally dehydrate ...

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Abstract

The present invention provides synthesis process of 1, 2, 3-trimethoxyl benzene. The synthesis process of 1, 2, 3-trimethoxyl benzene includes: throwing pyrogallol, water and tetrabutyl ammonium bromide into reactor; dropping dimethyl sulfate and industrial liquid alkali; lowering the temperature to 20 deg.c for crystallization; centrifugally dewatering after finishing crystallization to obtain coarse 1, 2, 3-trimethoxyl benzene product; mixing the coarse product, alcohol and water in the weight ratio of 1 to 2 to 4 in the reactor; heating the mixture to 90 deg.c for crystallization; centrifugally dewatering to obtain refined 1, 2, 3-trimethoxyl benzene product; and rectification in rectifying reactor through electrically heating to obtain final product. The said synthesis process is simple and suitable for industrial production.

Description

Technical field: [0001] The invention relates to a synthesis and preparation method of an organic compound, in particular to a preparation method of 1,2,3-trimethoxybenzene. Background technique: [0002] A kind of 1,2,3-trimethoxybenzene is a deep-processed product of gallnut, which can be used in the field of organic synthesis and pharmaceutical industry. At present, there is no method for producing pyrogallic acid in industry. Invention content: [0003] The purpose of this invention is to provide a kind of synthesis technique of 1,2,3-trimethoxybenzene. A kind of synthesis technique of 1,2,3-trimethoxybenzene of the present invention is characterized in that, pyrogallic acid (pyrobeilic acid), water, tetrabutylammonium bromide are dropped into by mass ratio 1:2:4 Stir in the reactor, after stirring the mixture evenly, add dropwise 250L of dimethyl sulfate and 180L of industrial liquid caustic soda (30%), and control the temperature in the reactor at about 35°C, keep t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/235C07C41/01
Inventor 毛义华郭祥洲朱名宝周国宗潘成名
Owner 湖北天新生物科技有限责任公司
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