Ubya
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separating Erythritol from a mixture of sodium saccharin and Erythritol
i found at the supermarket an artificial sweetener composed of just Erythritol and sodium saccharin, what i want is just the Erythritol.
Erythritol has a solubility of 610g/L in water at 22°C
Sodium Saccharin has a solubility of about 100g/L in water at 20°C (data taken from pubchem)
they are both quite soluble in water.
i read that saccharin is slightly soluble in water (1g in 290ml of water, but i don't know how accurate this value is, because i found other values
for the same compound)
i thought i could acidify the solution with HCl to turn the sodium saccharin into sodium chloride and saccharin that would precipitate.
i did a small test with less than a gram of mix in about 3ml of water, i added 1-2 drops of HCl but nothing happened, i checked the ph and was <1
PH.
any ideas on how i could separate this two compounds?
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weilawei
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How about heating to the melting point of erythritol and filtering off the solid sodium saccharin? 121°C vs. 299°C, respectively.
Have a patent related to the idea. It suggests forming an emulsion with a non-solvent.
[Edited on 13-4-2018 by weilawei]
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Ubya
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wow that would be a really HOT hot filtration.
about the emulsion method, i would need to heat the mixture in some kind of oil and then filtrate the (i hope so) solid sodium saccharin?
the patent also mentions the use of water, but wouldn't it just boil away at 121 °C?
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weilawei
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That's how I understood it from a quick skim. Water was his choice of a non-solvent because he wanted to separate nonpolar compounds. In your case,
oil (silicone perhaps? Or just give it a go with vegetable oils...) might be a good non-solvent, because it wouldn't boil at 121°C.
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