Method for recovering sodium trichloropyrindinol from sodium trichloropyrindinol production waste
A technology of sodium trichloropyridine and the sodium trichloropyridine, applied in directions such as organic chemistry, can solve problems such as time-consuming alkaline hydrolysis, a lot of catalyst consumption, long time, etc., and achieve the effect of cost saving
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Embodiment 1
[0025] The present embodiment provides a kind of method that reclaims clopyridox sodium from the clopyridox sodium production waste:
[0026] 15.0kg of water and 7.5kg of sodium hydroxide solution with a concentration of 30wt% were dropped into the alkaline hydrolysis kettle, and stirred and mixed evenly to obtain the first lye. Turn on the circulating condensed water, and control the temperature in the alkaline hydrolysis tank to not be higher than 50°C. Take 4.5 kg of sodium clopyridinate production waste and drop it slowly and uniformly into the alkaline hydrolysis kettle within 6 to 7 hours. After the dropwise addition, continue to react for 1 to 2 hours, take out and press filter to obtain the crude product of alkali hydrolysis. During the reaction, check the pH every 20 minutes, replenish the sodium hydroxide solution in time and control the pH of the reaction between 10 and 12.
[0027] Put 20kg of water and 4.0kg of solid sodium hydroxide into the high-pressure alkal...
Embodiment 2
[0029] The present embodiment provides a kind of method that reclaims clopyridox sodium from the clopyridox sodium production waste:
[0030] Put 16.0kg of water and 4.0kg of sodium hydroxide solid into the alkaline hydrolysis kettle, stir and mix evenly to obtain the first lye. Turn on the circulating condensed water, and control the temperature in the alkaline hydrolysis tank to not be higher than 55°C. Take 4.5 kg of sodium clopyridinate production waste and drop it slowly and uniformly into the alkaline hydrolysis kettle within 7 to 8 hours. After the dropwise addition, continue to react for 2 to 3 hours, take out and press filter to obtain the crude product of alkali hydrolysis. During the reaction, check the pH every 20 minutes, replenish the sodium hydroxide solution in time and control the pH of the reaction between 12 and 14.
[0031] Put 20kg of water and 2.0kg of solid sodium hydroxide into the high-pressure alkali analysis kettle, stir and mix evenly to obtain th...
Embodiment 3
[0033] The present embodiment provides a kind of method that reclaims clopyridox sodium from the clopyridox sodium production waste:
[0034] Put 6.0kg of water and 18.0kg of 40wt% sodium hydroxide solution into the alkaline hydrolysis kettle, stir and mix evenly to obtain the first lye. Turn on the circulating condensed water, and control the temperature in the alkaline hydrolysis tank to not be higher than 60°C. Take 4.5 kg of sodium clopyridinate production waste and drop it slowly and uniformly into the alkaline hydrolysis kettle within 8 to 9 hours. After the dropwise addition, continue to react for 3 to 4 hours, take out and press filter to obtain the crude product of alkali hydrolysis. During the reaction, check the pH every 20 minutes, replenish the sodium hydroxide solution in time and control the pH of the reaction between 11 and 13.
[0035]Put 20kg of water and 6.0kg of solid sodium hydroxide into the high-pressure alkali analysis kettle, stir and mix evenly to o...
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