Two miscible liquid can be separated by the process known as DISTILLATION. 
It is a process which involves conversion  of a liquid into vapours by heating followed by condensation of vapours this produce cooling.
The two liquids should have sufficient difference of 25 C in their boiling points.
PRINCIPLE-Separation with the help of distillation is based on the principle that each miscible has its own boiling point {having a difference of about 25 C in their boiling point} of two different miscible liquids. 
The more volatile component distills over first while less volatile component distills after words.
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