EXTRACTING AND SEPARATING METHOD BY SUPERCRITICAL SOLVENT

摘要

PURPOSE:To enhance the extractive decomposition capability and extraction velocity by increasing the pressure of a solvent and then increasing the temp. easily to form a large amt. of a supercritical solvent which is used for extraction. CONSTITUTION:Gaseous carbon dioxide to be used as an extracting solvent flowing from a tank 20 is cooled by a liquefier 21 to form liquefied carbon dioxide. The liq. is filtered in a filter 23 to remove foreign matter. Then the pressure of the liq. is increased to above a critical point by a pump 24 and the temp. is increased by a heat exchanger 25 to a supercritical state to obtain a supercritical extracting solvent. The supercritical liquefied carbon dioxide is brought into contact in an extraction tank 26 with substances to be extracted supplied from a device 27 for supplying the substances to be extracted and a specified component is dissolved and extracted from the substances to be extracted. The liquefied carbon dioxide wherein the substances to be extracted are dissolved is introduced from the extraction vessel 26 to a separation vessel 30 to separate the desired specified component. The separated specified component is stored in a selection vessel 31 and selected.