Keras
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Recovering caesium carbonate from caesium bicarbonate
Folks,
I plan to try a reaction which involves the transformation of caesium carbonate into caesium bicarbonate in its mechanism. Caesium carbonate in not
horribly expensive, but it would be nice if I could recover at least part of it from the ashes of the reaction.
If I use NaOH (or KOH) directly to raise the pH, I will probably end up with a mixed carbonate…
CsHCO₃ + NaOH → CsNaCO₃ + H₂O
Of course, I could turn caesium bicarbonate into caesium chloride, but then would the metathesis work? (Thinking of it, it might, given it works with
sodium and potassium).
CsCl + NaOH → CsOH + NaCl.
From CsOH, it’s easy to turn back to Cs₂CO₃ just by bubbling CO₂ in the solution… (I wouldn't want to isolate CsOH, since it apparently
attacks glass).
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unionised
International Hazard
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Bicarbonates decompose on heating to form carbonates.
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Fery
International Hazard
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Keras - Cs2CO3 is perhaps the most hygroscopic carbonate. I got it cheap but slightly wet. It dried in a desiccator over silica gel nit earlier than
in 2 months. I got it in original chemical bottle. After drying I put the bottle into 2 layers of sealed plastic bags. I did not want to heat it as it
would certainly completely dissolve in that traces of moisture. Solubility in water is 2605 g/L (15 °C).
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Keras
National Hazard
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Quote: Originally posted by Fery  | | Keras - Cs2CO3 is perhaps the most hygroscopic carbonate. I got it cheap but slightly wet. It dried in a desiccator over silica gel nit earlier than
in 2 months. I got it in original chemical bottle. After drying I put the bottle into 2 layers of sealed plastic bags. I did not want to heat it as it
would certainly completely dissolve in that traces of moisture. Solubility in water is 2605 g/L (15 °C). |
Thanks for that! I’m not sure I really care about its water contents, since I plan to use it with dimethyl carbonate and p-cresol, in a methylation
reaction which basically doesn’t care about traces of water.
I’ll tell you when it arrives how it went!
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