You want to "save" the methanol after separation? Or just discard it?
How pure is the water?
How pure is the methanol?
What quality (percent efficiency) can you tolerate of the two streams after separation? Is 5% "polutted" methanol "good enough" when the streams are separated?
What is your budget?
What are your resources?
When do you need the system working?
(You can buy anything Fast, Cheap, or High Quality. Pick two of the three.)
The solution include Methanol (40%) and Water (60%), i have to recover Methanol with around 80%, because I want reuse that recovered methanol in our process line, And i don't care about water.
What would that take- perhaps 1 theoretical stage? Might a single atmospheric flash get you there, or close enough? If not, it's a short distillation. Either way, you're going to need to evaporate and then condense all the methanol and probably the 20% of water you can tolerate in your product too. No magic membranes are going to get you there for less cost.
