Process for selective extraction and separation of organic...

B - Operations – Transporting – 01 – D

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B01D 11/02 (2006.01) C11B 1/10 (2006.01)

Patent

CA 2669477

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.

Procédé d'extraction pour récupérer sous haute pression des substances solubles à partir de matières premières organiques végétales ou animales, selon lequel : on utilise comme solvant un gaz surcritique ; la matière organique est remplie dans un ou plusieurs récipients à haute pression, le récipient est fermé puis est sollicité avec une pression supérieure à 800 bars ; ensuite, au cours d'une étape d'extraction, le récipient rempli à haute pression est traversé au moins une fois par le flux de gaz surcritique, sachant qu'on ne mélange pas d'agent entraîneur supplémentaire au gaz surcritique, puis le gaz surcritique chargé est apporté en totalité ou en partie à une étape de séparation au cours de laquelle, en abaissant la pression, les substances naturelles ou des mélanges de substances sont enlevés ou séparés les uns des autres, sachant que la pression durant l'étape d'extraction dépasse d'au moins 10 % la pression maximale de solubilité dans le gaz surcritique de l'huile ou graisse propre à la matière première, sachant que l'huile ou graisse respective propre à la matière première sert d'agent entraîneur.

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