I have recently starting distilling my own essential oils using a still that I built out of an old diesel barrel. Before the first run with the still, I cleaned the inside using soap and water. I distilled until I created 5 gallons of hydrosol. The issue is that it seems that the oil and water are emulsified (hope that is the right term, I don't have a background in chemistry). There appears to be a thin film of oil on the surface, rather than the "globs" I would expect. Another reason I believe this is an emulsion is that no matter how much I skim off the top, that film is always present, making me think that the oil is thoroughly mixed in the solution.I have done some research and it seems to be that there may be a surfactant present that is causing this.
Is there a way that I can test for the presence of a surfactant?
Does it sound like my issue is the presence of a surfactant or something entirely different?
Could the soap I used to clean it be the surfactant?
Update in Response to Answer:
The end goal is to use a few drops of the oil to enhance the smell of a facial product (beard oil), so the end product has to be safe for skin.
I don't have a diagram at the moment, but here is a smaller still that is basically the same as my setup, just much smaller. I am using a propane heat source to control the temperature.
To be honest, I don't know the expected structure of the oils. This is my first attempt at anything like this (I'm a software engineer that recently acquired an interest in chemistry!).
Thanks for the help!