Can I ask for advice on crystallization of 25% soda ash solution?

2010-06-10View Original

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This post was last edited by frankqe on 2010-9-19 09:04 Is 25% soda ash (NaOH) solution easy to crystallize? What is the approximate density of this lye? If crystals precipitate, do the crystals float on the surface of the liquid, or settle at the bottom?

Reply #22010-06-10

Are you talking about sodium hydroxide or sodium carbonate? The solubility of sodium carbonate is the highest when it is about 35.4 degrees, and the mass percentage concentration at this time is about 33%. If the concentration is about 25%, crystallization will begin when the solution temperature drops below 27 degrees. What is precipitated is Na2CO3.10H2O.

Reply #32010-07-12

NaOH can only be made by evaporating, concentrating and then cooling the scraper. Crystals cannot be produced by evaporation.

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Can I ask for advice on crystallization of 25% soda ash solution?

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