In Farmstead Arts we did some distilling. It is a pretty simple but specific process involving some glass wear that costs about $400. I'm thinking it would be possible to gather or make the materials on your own for a lot cheaper. To distill something you need a lower chamber to boil water, an upper chamber to hold the materials being distilled, some hose, and a condensing tube with valves. As the water stats to boil the steam rises up through the material above and gathers the essential oils. When the oily steam gets to the top of the material chamber it hits a right angled tube and then starts heading down into the condensing tube. The condensing tube is actually a tube within a tube. The inside tube is where the steam goes and the outside tube has a continuous flow of cold water from the bottom that drains out the top. The water chills the inner tube and causes the steam to condense to liquid. The water droplets run down the side into a valved collection area at the bottom. As the drops accumulate you will start to see the water and oil separate with the oil floating on top of the water (there will be a lot more water than oil). It takes about 30 minutes for the oil to start appearing and about 1 to 3 hours to completely harvest the oil depending on the materials. We distilled peppermint leaves and orange rinds. When you're done distilling carefully open the valve and allow all the water to drain out. Close the valve right when you reach the water/oil line. This should leave pure oil which you can collect in a dropper bottle and use to infuse flavor in drinks and foods, burn as incense, scent salves, or use for medicinal purposes. Here's some photos of the process.
Breaking off peppermint leaves.
Steaming the orange
Steaming the peppermint
The thin layer of whitish fluid on the top is the peppermint oil
Waiting for the oil to collect
Draining the water
Collecting the oil
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