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Stripping methanol and soap with water

Stripping methanol and soap with water

Stripping methanol and soap with water

(OP)
Good evening all.

I'm trying to figure out how to calculate the theoretical amount of water needed to remove a given amount of methanol and soap from biodiesel.

I don't know if these are the right questions but:

What is the saturation point of methanol in water? Is it temperature dependant?

What is the saturation point of sodium methylate or sodium sulphate in water?

What would be a good ballpark velocity in a counter current situation?

Thanks in advance for any help.

RE: Stripping methanol and soap with water

Methanol, like ethanol, is miscible in water.  That is, there is no saturation point.

RE: Stripping methanol and soap with water

With regards to solubility of NaOCH3 in water: it decomposes (sometimes violently) to methanol and sodium hydroxide (with lots of heat generation).  The methanol is infinitely soluble in the water (see SMF's answer).  Caustic solubility is temperature dependent and a good reference is either lang's or crc handbooks of chemistry.  Sodium sulfate is similar to caustic.

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