I have researched a lot about solvent extracts. Do you know that we all use them? Soy bean oil is extracted with hexane,propane,butane and other solvents. They turn soybeans into flakes, then they blast them into oil. Then they take the flakes and clean them by degassing and washing, then they feed those flakes to animals that we eat.
facts.. 9.11.1.2 Process Description6-9 The following process description discusses only soybean oil manufacture, because emission factors are available only for that activity. Corn, cottonseed, and peanut oil processing are similar to soybean processing, except for differences in the soybean preparation for oil extraction. The process for soybeans typically consists of five steps: oilseed handling/elevator operations, preparation of soybeans for solvent extraction, solvent extraction and oil desolventizing, flake desolventizing, and oil refining.
the link and full description..
http://www.epa.gov/ttnchie1/ap42/ch09/final/c9s11-1.pdf
So BHO came from farmers lol