Method for the selective extraction and separation of organic substances by means of high pressure

Abstract

The invention relates to an extraction method for producing soluble substances from organic plant or animal raw material with high pressure, wherein supercritical gas is used as a solvent and wherein the organic material is filled into one or a plurality of high pressure reservoirs. The high pressure reservoirs are closed and a pressure of more than 800 bar is subsequently applied. In an extraction step, the supercritical gas flows at least once through the filled high pressure reservoir, wherein no additional entraining agent is added to the supercritical gas. Subsequently the charged supercritical gas is fed completely or partially to a separation stage, wherein natural substances or substance mixtures are reacted or separated from each other by lowering the pressure. The pressure in the extraction stage exceeds the maximum solubility pressure of the oil or fat of the raw material in the supercritical gas at least by 10%. The respective oil or fat of the raw material serves as the entraining agent.

Dependencies are inferred from the claim text.