A process and system to extract essential oil from a material is described. The process includes expressing the essential oil into water to form a fluid mixture that contains essential oil, an essential oil-water emulsion, and water; heating the fluid mixture to destabilize the essential oil-water emulsion and separating the heated fluid mixture into a waste mixture and a product fluid mixture, where the concentration of essential oil in the product fluid mixture is greater than the concentration of essential oil in the fluid mixture.