Langyou Chemical
SUPPLEMENTS
Preparation Of Hypophosphorous Acid
Preparation of hypophosphoric acid
Where hypophosphoric acid is prepared, it is necessary to understand the method. First take an appropriate amount of white phosphorus and place it in a corrosion-resistant device. Slowly inject it with an aqueous solution of slaked lime. The liquid should have an appropriate concentration, and the injection should be slow to prevent excessive reaction.
When white phosphorus encounters lime water, a chemical reaction occurs. During this time, white phosphorus is in the lime water environment, and the valence state of phosphorus elements is gradually changed, resulting in new compounds. During this reaction, the temperature should be controlled, and it should not be too high or too low. If it is too high, the reaction will be too fast, which is difficult to control; if it is too low, the reaction will be slow, which is time-consuming and laborious. It is appropriate to use a water bath to stabilize its temperature and keep it in a suitable range.
After the reaction is completed, a mixed solution is obtained. There is formed calcium hypophosphate and other substances in it. To obtain hypophosphoric acid, the separation technique should be performed again. Sulfuric acid is slowly added to the mixed solution, and the sulfuric acid and calcium hypophosphate meet and react again. Sulfate combines with calcium and sinks at the bottom of the vessel, while hypophosphoric acid remains in the solution.
At this time, the solution is still mixed with other substances, and it needs to be filtered to remove its precipitation. The filtrate is the liquid containing hypophosphoric acid. However, it is not pure, and it can be refined by distillation and other methods to improve its purity. When distilling, pay attention to the heat and air pressure, so that the hypophosphoric acid can be evaporated at a suitable temperature, and then cooled and condensed, and finally obtain pure hypophosphoric acid. During the entire preparation process, it is necessary to abide by the procedures, pay attention to safety, and prevent accidents.
Where hypophosphoric acid is prepared, it is necessary to understand the method. First take an appropriate amount of white phosphorus and place it in a corrosion-resistant device. Slowly inject it with an aqueous solution of slaked lime. The liquid should have an appropriate concentration, and the injection should be slow to prevent excessive reaction.
When white phosphorus encounters lime water, a chemical reaction occurs. During this time, white phosphorus is in the lime water environment, and the valence state of phosphorus elements is gradually changed, resulting in new compounds. During this reaction, the temperature should be controlled, and it should not be too high or too low. If it is too high, the reaction will be too fast, which is difficult to control; if it is too low, the reaction will be slow, which is time-consuming and laborious. It is appropriate to use a water bath to stabilize its temperature and keep it in a suitable range.
After the reaction is completed, a mixed solution is obtained. There is formed calcium hypophosphate and other substances in it. To obtain hypophosphoric acid, the separation technique should be performed again. Sulfuric acid is slowly added to the mixed solution, and the sulfuric acid and calcium hypophosphate meet and react again. Sulfate combines with calcium and sinks at the bottom of the vessel, while hypophosphoric acid remains in the solution.
At this time, the solution is still mixed with other substances, and it needs to be filtered to remove its precipitation. The filtrate is the liquid containing hypophosphoric acid. However, it is not pure, and it can be refined by distillation and other methods to improve its purity. When distilling, pay attention to the heat and air pressure, so that the hypophosphoric acid can be evaporated at a suitable temperature, and then cooled and condensed, and finally obtain pure hypophosphoric acid. During the entire preparation process, it is necessary to abide by the procedures, pay attention to safety, and prevent accidents.
Scan to WhatsApp
