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Decolorization method of pyridinium finished product

A technology for finished salt products and pyridine, applied in the field of decolorization of pyridine salt products, can solve the problems of poor operating environment, high risk and high consumption of finished products, and achieve the effects of improved working environment, safe production and operation process and less consumption

Active Publication Date: 2015-02-11
ANHUI JINGHE IND
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Problems solved by technology

[0003] The present invention is to solve the problems of poor operating environment, high risk, and high consumption of finished products in the prior art, and provides a decolorization method for finished products of pyridinium salt

Method used

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  • Decolorization method of pyridinium finished product

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Embodiment Construction

[0012] Put 500kg of finished pyridinium salt and 750kg of methanol into a 5000L jacketed glass-lined reactor, raise the temperature to 50°C and stir for 0.5 hours, then add 5kg of activated carbon, continue stirring for 0.5 hours, press out the activated carbon with a filter press, and The filtrate is sent to the distillation kettle, and the methanol is recovered by distillation at 0.09MPa and 35°C. After the methanol is evaporated to dryness, add 600kg of absolute ethanol, heat up to 50°C and keep it for 2 hours, then move to the crystallization kettle to cool down and crystallize, and then use a centrifuge to shake the material , After getting the wet product, dry it to get about 450kg of finished product with a content of 99.5%.

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Abstract

The invention relates to a decolorization method of a pyridinium finished product, which comprises the following steps: 1) adding a pyridinium finished product to be decolorized and methanol into a reaction kettle in a weight ratio of 1:1.5, heating to 50 DEG C, stirring for half an hour until all the material is completely dissolved, adding activated carbon which accounts for 1 wt% of the pyridinium finished product, and continuing stirring for half an hour to perform decolorization; 2) after the decolorization, completely extruding out the activated carbon by using a press filter, sending the filtrate into a distillation kettle, and distilling to recover the methanol; and 3) after drying off the methanol by distillation, adding ethanol to recrystallize, centrifugating to obtain the finished product, and drying to obtain the high-quality product. When being used for decolorizing the pyridinium, the method is safer in the production operation process, obviously improves the working environment, can recover the methanol, and thus, has lower consumption of methanol.

Description

technical field [0001] The invention belongs to the technical field of chemical decolorization, in particular to a method for decolorization of pyridinium salt products. Background technique [0002] The existing pyridinium salt product decolorization process uses thionyl chloride to oxidize and decolorize. The amount of thionyl chloride required is 2 to 3 times that of the pyridinium salt product, so a large amount of thionyl chloride will be consumed, and the used thionyl chloride It cannot be recycled, and it must be treated with liquid alkali before it can be discharged. The oxidation decolorization process will produce acid gases such as hydrogen chloride and hydrogen sulfide. The production process has a poor operating environment and a high degree of danger. Contents of the invention [0003] The present invention aims to solve the problems of poor operating environment, high risk, and high consumption of finished products in the prior art, and provides a method fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/18C07D213/127
CPCC07D213/127C07D213/18
Inventor 赵金刚贺玉杨志健
Owner ANHUI JINGHE IND
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