An apparatus and method of use employs a multiple displacement evacuation tank and a cavitation apparatus. Heated fluid from the cavitation apparatus is used to treat a plant material to obtain a purified oil product therefrom. The cavitation apparatus output is used to both heat the multiple displacement evacuation tank contents and supply a feed to the multiple displacement evacuation tank for oil product manufacture. The fluid is preferably a lipid emulsion and the plant material is preferably a hemp material that allows for recovering of the cannabinoids therefrom.