Stripping methanol and soap with water

[Dropout]

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.

 

[SMF1964]

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

 

[blackhat72]

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.