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[1314] Effect of hydrothermal dewatering of Loy Yang lignite on gaseous and wastewater products

^○劉祥春¹, 平島剛¹, 野中壮泰¹, 笹木圭子¹ (1.Kyushu University)

司会:大川浩一(秋田大学)

Keywords:hydrothermal treatment, wastewater products, gaseous products

The changes in the gaseous and wastewater products obtained from hydrothermally treated lignite were investigated. Gaseous and wastewater products were characterized by gas chromatography and total organic carbon (TOC) analyzer, inductively coupled plasma atomic emission spectroscopy, and high performance liquid chromatography (HPLC), respectively. The results showed that TOC value began to apparently increase at the temperature of 200 °C, when CO₂ started to be detected. The detection of CO₂ is due to decarboxylation. Glucose, xylose, glyceraldehydes, and levulinic acid were detected by HPLC. Moreover, the total amounts of monovalent cations (Na⁺ and K⁺) in wastewater increased markedly from 100 to 150 ^oC and then changed slight with increasing temperature. The total amount of divalent cation Mg²⁺ in wastewater increased greatly up to 200 ^oC then changed little with increasing temperature, and the total amount of divalent cation Ca²⁺ increased apparently up to 250 ^oC.