Carboxymethyl cellulose purification by salting out ethanol
Hello everyone,
As well known, sodium chloride and sodium glycolate by-products are occured while producing sodium carboxymethyl cellulose (NaCMC). In this stage it
is called technical grade NaCMC, which possess ~70% active matter content. For enrichment of NaCMC up to 90% active matter content, 70% ethyl alcohol
has been using as a solvent for decades. After the purification process, ethyl alcohol is going to be distilled and re-used for the next purification.
In order to decreasing the costs of distillation, I have performed some laboratory experiments by using salt out technique on ethyl alcohol. I
prefered potassium carbonate as deliquescence salt. Everything works great but I also want to reduce the potassium carbonate costs.
After adding the potassium carbonate to sodium chloride + sodium glycolate + 70 % ethanol solution, a distinct phase seperation is occured. Lower
phase (water phase) contains most of the salts (sodium chloride + potassium carbonate + ~sodium glycolate). I want to gain potassium carbonate again
from this solution. Actually if i could seperate sodium chloride and potassium carbonate effectively, everything would be fine.
Thanks in advence for your helps.
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