how can you seperate two immiscible liquids ?
Two immiscible liquids can be separated from each other by using a separating funnel. This method of separation is based on the difference in densities of the liquids.
Let me quote an example for you.
Consider a mixture of kerosene oil and water. Pour this mixture into a separating funnel from the top. Close the mouth of the funnel and shake the mixture vigorously. Then allow it to settle for a while. You will notice that oil being less dense floats over water. On the other hand, water makes up the lower level as it is denser. Now, open the stopcock. Water will first come out. Collect it n a beaker. Close the stopcock when all the water has eluted. In this way the mixture of kerosene oil and water gets separated. The following diagram illustrates this process.
Mixtures of any two or more immiscible liquids can be separated using this technique.
However, what I made out from your answer is that there is some sort of confusion among a filter funnel, a separating funnel and the process of fractional distillation. Let me make this clear for you.
Filter funnel and separating funnel are two different things. A filter funnel is used to separate a solid from a liquid. A separating funnel on the other hand is used to separate a mixture of two immiscible liquids.
Now, fractional distillation is a different concept wherein a mixture of two or more miscible liquids having difference of less than 25 K in their boiling points are separated
Hope this piece of information helps!