【企画講演】 最近の石炭等エネルギーの開発・利用の動向

[2301-06-04] 溶剤処理による低品位炭の改質とイオン液体を用いた溶剤可溶成分の脱硫

○加藤 貴宏¹、大川 浩一¹、菅原 勝康¹、Worasuwannarak Nakorn² (1. 秋田大学、2. The Joint Graduate School of Energy and Environment, Center of Excellence on Energy Technology and Environment, King Mongkut’s University of Technology Thonburi Bangmod)

司会：濱中晃弘（九州大学）

キーワード：石炭、溶剤抽出、硫黄、イオン液体、XANES

Three kinds of coal with different ranks and sulfur contents were extracted using 1-methyl naphthalene at 350°C. The sample coals were fractionated into three fractions: a solvent-soluble fraction, a deposited fraction from the solvent-soluble fraction at room temperature, and the solvent-insoluble fraction. The forms of sulfur in the raw coals and the extracted products were determined by X-ray adsorption near edge structure analysis. Most of the inorganic sulfur was transferred to the solvent-insoluble fraction and the organic sulfur was distributed among the three fractions. Interestingly, the solvent-soluble fraction contained organic sulfur without inorganic sulfur, and only thiophenic sulfur was detected independent of coal type. Because of the high selectivity of imidazolium type ionic liquid for thiophenic sulfur, dimethyl imidazolium methyl sulfate was applied to extract the sulfur contained in the solvent-soluble fraction. The extractive experiment using ionic liquid showed that the sulfur content decreased linearly with the number of extraction stages. A high extent of desulfurization was obtained with a high concentration of ionic liquid.