| abstract |
A compressed gas, e.g. carbon dioxide, or a gas cure is injected under pressure into a press to increase the yield of oil from a natural material, particularly plant material, e.g. canola and calendula seeds. The effect is brought about by the gas dissolving in the oil to give an oil-rich gas/oil composition. The mass of gas required is less than that of conventional processes. The press comprises a screw 2 driven by motor 1, a hopper 4 and entry points 5 for pressurized gas. |