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Method for preparing 5-chloro-8-hydroxyquinoline

A technology of hydroxyquinoline and chloro-o-quinoline, applied in the field of preparing 5-chloro-8-hydroxyquinoline, can solve the problems of cumbersome loss, low yield, incomplete reaction, etc., achieve cost reduction, high content, and increase the total Yield effect

Inactive Publication Date: 2012-08-08
江苏力达宁化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two reasons for the low yield: one is that the reaction is not complete, and the other is that a large amount of organic solvent is used in the post-purification treatment, which is cumbersome and expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] In a 1000L reactor, put 100 kg of 4-chloro-o-nitrophenol, 173.7 kg of 4-chloro-o-aminophenol, and 175 kg of glycerin, stir and heat up to 120°C, add 410 kg of sulfuric acid dropwise, and finish the dropwise reaction at 150°C for 3 Hour. During the heat preservation period, 70 kg of water was removed by vacuum. After the heat preservation reaction, the temperature was lowered to 60° C., and 10% aqueous sodium hydroxide solution was added dropwise until the pH value was 7. Centrifuge, put the filter cake into a 3000L kettle, add 2200 kg of water, 200 kg of 32% industrial hydrochloric acid, 15 kg of activated carbon, and filter after dissolving. The filtrate is pumped into another 3000L kettle, and 233 kg of 30% liquid caustic soda is added dropwise to neutralize and centrifuge. Filter cake is put into another 2000L kettle, adds 1250 kilograms of 32% industrial hydrochloric acid, centrifuges after stirring for 1 hour.

[0011] Put the filter cake into another 3000L kett...

Embodiment 2

[0013] In a 1000L reactor, put 97 kg of 4-chloro-o-nitrophenol, 145 kg of 4-chloro-o-aminophenol, 150 kg of glycerin and 100 kg of toluene, stir and heat up to 105°C, add 410 kg of sulfuric acid dropwise, and drop it at 110 ℃-145 ℃ heat preservation reaction for 5 hours. During the heat preservation period, 65 kg of water was removed and toluene was evaporated. After the heat preservation reaction, the temperature was lowered to 60° C., and 10% aqueous sodium hydroxide solution was added dropwise until the pH value was 7. Centrifuge, put filter cake in 3000L kettle, add 1850 kg of water, 170 kg of 32% industrial hydrochloric acid, 12 kg of activated carbon, filter after dissolving. The filtrate is pumped into another 3000L kettle, and 200 kg of 30% liquid caustic soda is added dropwise for neutralization and centrifuged. Put the filter cake into another 2000L kettle, add 1100 kilograms of 32% industrial hydrochloric acid, and centrifuge after stirring for 1 hour. Put the fi...

Embodiment 3

[0015] In a 1000L reaction kettle, put 97 kg of 4-chloro-o-nitrophenol, 160 kg of 4-chloro-o-aminophenol, and 150 kg of glycerin, stir and heat up to 120°C, add 410 kg of sulfuric acid dropwise, and finish the dropwise reaction at 150°C. Hour. After the heat preservation reaction, the temperature was lowered to 60° C., and 10% aqueous sodium hydroxide solution was added dropwise until the pH value was 7. Centrifuge, put filter cake into 3000L kettle, add 2050 kg of water, 160 kg of 32% industrial hydrochloric acid, 20 kg of activated carbon, filter after dissolving. The filtrate is pumped into another 3000L kettle, and 187 kg of 30% liquid caustic soda is added dropwise to neutralize and centrifuge. Put the filter cake into another 2000L kettle, add 770 kg of ethanol, 330 kg of water and 15 kg of activated carbon, heat to dissolve, filter and decolorize, and cool the filtrate to 0 degrees for centrifugation. The filter cake was dissolved and decolorized once with 770 kg of e...

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Abstract

The invention discloses a method for preparing 5-chloro-8-hydroxyquinoline and belongs to the technical field of chemistry. The 5-chloro-8-hydroxyquinoline is prepared from raw material components including 4-chloroonitrophenol, 4-chloroortho-aminophenol, glycerol and concentrated sulfuric acid according to a molar ratio of 4-chloroortho-aminophenol to 4-chloroonitrophenol of 1.6:3.2 and a molar ratio of glycerol to 4-chloroonitrophenol of 2.6:5.2 and a molar ratio of sulfuric acid to 4-chloroonitrophenol of 3:9. The method comprises: dripping sulfuric acid into the components under a condition that the temperature of the solvent is 100 to 170 DEG C; and under the sulfuric acid is dripped completely, promoting the reaction to complete by the following measures and removing part of water generated in reaction under vacuum, or removing part or all water byproduct of the reaction by using benzene, methylbenzene, paraxylene or chlorobenzene as an azeotropic water reducing agent. During after-reaction treatment, industrial concentrated hydrochloric acid is used in place of organic solvent to perform refining treatment to remove pigments and impurities from the product, and the product yield is increased. The method is mainly used for synthesizing cloquintocet-mexyl serving as a herbicide component and can also be used as an animal feed additive, a disinfectant and a metal preservative.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing 5-chloro-8-hydroxyquinoline. Background technique [0002] 5-Chloro-8-hydroxyquinoline is mainly used in the synthesis of herbicide component Jieduquine, and is also used as an animal food additive, disinfectant and metal preservative. There are many ways to prepare 5-chloro-8-hydroxyquinoline. The synthetic technical literature of the 5-chloro-8-hydroxyquinoline that is seen in report and disclosure mainly contains: 1., use 8-hydroxyquinoline as raw material, be a solvent with a large amount of glacial acetic acid, prepare 5-chloro-8-hydroxyquinoline with chlorine gas Hydroxyquinoline, the yield is 52.7% (JP162066), the main by-product is 5,7-dichloro-8-hydroxyquinoline. The shortcoming of this technology is that main raw material is expensive, and reaction selectivity is poor, and impurity is many; 2., be raw material with 8-hydroxyquinoline, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D215/28
Inventor 胡治海
Owner 江苏力达宁化工有限公司
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