| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing fulvic acid from low-grade coal using high-temperature water under pressure to increase the amount of fulvic acid extremely effective as a physiologically active substance for plants and separable only a small amount from low-grade coal by the water extraction under normal pressure because fulvic acid is a water-soluble substance in fumic materials. SOLUTION: Fulvic acid is produced in high yield by oxidizing and decomposing fumic materials in low-grade coal with hot pressurized air, extracting the decomposition product with high-temperature water and separating the aqueous solution of fulvic acid from the reaction system before the start of the decomposition of the extracted fulvic acid. COPYRIGHT: (C)2004,JPO&NCIPI
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