The problem of carbonization speed of sodium hydroxide and sodium carbonate
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I have a mixed solution containing sodium hydroxide, sodium carbonate and sodium chloride. I am going to add carbon dioxide to the sodium hydroxide and sodium carbonate to carbonize it into sodium bicarbonate. The solubility of sodium bicarbonate is low and most of it can be released. However, through a small test, the carbonation rate is slow. I would like to ask the experts on soda ash, in this carbonation process, which one is slower is sodium hydroxide turning into sodium bicarbonate or sodium carbonate turning into sodium bicarbonate.
Its solid is also called caustic soda, fire soda, caustic soda, caustic soda, etc. It is a white solid that is water-absorbent and can be used as a desiccant, and is easily deliquescent in the air (the phenomenon of dissolving due to water absorption is a physical change)； Dissolves in water and releases a lot of heat. The liquid is colorless, astringent and greasy.
I feel that sodium hydroxide carbonizes faster than sodium carbonate.
From the reaction point of view, when NaOH is added to CO2, it will become Na2CO3. When CO2 is excessive, NaHCO3 will be generated. In actual production, Na2CO3 is generated from the beginning to the end of the carbonization process. It’s just that there is too much CO2 in the later stages of the reaction. There are more nahco3. And crystallized out. Under the cooling operation, the crystal grows.
The ions in this liquid phase are co3 2- oh- and C l-, and the cation is Na+. You need to pass in CO2. The principle is: co2+h2o=h2co3. However, carbonic acid is unstable in solution, so h2co3 resolves out H+ and Hco3 -, and Hco3 - resolves out H+ and co3 2-. But the second step in this process is extremely slow. During the process of introducing co2, Hco3 - and oH - actually react to form H2O and co3 2-, so the first thing produced in the solution is Na2co3, and when co2 continues to be introduced, Hco3 is formed. -