METHOD OF ISOLATION FOR HUMIC SUBSTANCES USING SUBCRITICAL/SUPERCRITICAL WATER

摘要

The present invention relates to a humic substance separation method using subcritical and supercritical water. The method is used to remove the residues of inorganic salts and acid-base compounds generated by using a conventional acid-base cross-extraction method to increase refining yields, apply a supercritical condition with a high hydroxyl radical concentration rate to extract a humic substance in order to replace an extraction step executed under a strong alkaline condition due to the high hydroxyl radical concentration rate, and uses a subcritical water to change water to have properties in an acidic condition in order to separate and recover the mixture solution of humic and fulvic acids as a single substance, thereby replacing another extraction step executed under an acidic condition. The mixture solution is reduced to water after a predetermined period due to the nature of the supercritical water to enable an eco-friendly separation process harmless to the human body and the environment.