Name : [in Japanese]
Location : [in Japanese]
Date : October 30, 2024 - October 31, 2024
Pages 10-11
To prepare humic acid from biomass (sugarcane leaves) with high yield, a two-step hydrothermal treatment using acidic and alkaline solutions was carried out. It was confirmed that when the biomass was treated directly with hot alkaline solution, the yield of humic acid was only 5% of the total carbon. Since humic acid can be obtained in high yields when reagent lignin is treated with hot alkaline solution, it was speculated that cellulose and hemicellulose in the biomass inhibit the alkaline extraction of lignin. To decompose cellulose and hemicellulose, the biomass was hydrothermally treated in an acidic solution at different temperatures and reaction times, and the obtained sample was then treated in an alkaline solution to recover humic acid. At 140°C, that hemicellulose decomposes, the humic acid yield increased to approximately 8%. It was found that by increasing the temperature to 180°C and extending the reaction time, the cellulose was decomposed and the humic acid yield increased to 15%.
