Reading about water vapor distillation, I found two different approaches:
The direct approach has an arrangement like this:
Here the chamber contains the water and the plant. It is cooled and as the water vapor flows away it carries the low volatile compound vapor of the plant/vegetable. Both condense and the oils can be obtained.
The plant matter is in the same pot as the water.
The indirect approach is setup like this:
Here the water vapor is generated in the first container (the one furthest to the left) and when flowing through the second flask, it carries the oil vapor. I should remark: the plant matter is in a different pot than the water.
Do you see any fundamental differences in these processes or something related?
It might have to do with the aggregation state of the material we need to extract, but I'm not sure.