Method for defluorinating fluorine-containing hydrochloric acid
A fluorine-containing hydrochloric acid and defluorination technology, which is applied in chemical instruments and methods, halogen/halogen acid, chlorine/hydrogen chloride purification, etc., can solve the problems of bringing in metal ions, long defluorination time, and low defluorination rate. Achieve the effects of large operating flexibility, high defluorination efficiency, and reduced production costs
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Embodiment 1
[0034] Weigh 300 g of fluorine-containing hydrochloric acid (hydrogen chloride mass percentage concentration is 16%, fluorine ion mass percentage concentration is 0.198%) and add it to a 500ml flask, add boric acid and potassium chloride 0.75g and 0.90g respectively, and stir the reaction at 30°C After 60 minutes, the reaction solution was distilled at atmospheric pressure to obtain the bottom liquid and 280 g of defluorinated hydrochloric acid, and the fluoride ion content in the defluorinated hydrochloric acid was determined to be 56 ppm.
Embodiment 2
[0036] Weigh 300 g of fluorine-containing hydrochloric acid (hydrogen chloride mass percentage concentration 16%, fluoride ion mass percentage concentration 0.198%) and add it to a 500ml flask, add boric acid and potassium chloride 5.0 g and 3.0 g respectively, stir and reflux at 100°C After 30 minutes, the reaction solution was subjected to atmospheric distillation to obtain the bottom liquid and 282 g of defluorinated hydrochloric acid, and the fluoride ion content in the defluorinated hydrochloric acid was determined to be 57 ppm.
Embodiment 3
[0038] Weigh 300 g of fluorine-containing hydrochloric acid (hydrogen chloride mass percent concentration 16%, fluoride ion mass percent concentration 0.198%) and add it to a 500ml flask, add boric acid and potassium chloride 2.5g and 6.0g respectively, and stir and react at 40°C for 120min , The reaction solution was distilled at atmospheric pressure to obtain the bottom liquid and 282g defluorinated hydrochloric acid, and the fluoride ion content in the defluorinated hydrochloric acid was measured to be 57ppm.
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