24.ハイパーコール製造における高温抽出機構の検討(3) : 種々の抽出条件下で得られたハイパーコールのキャラクタリゼーション

抄録

Structural characterization of ashless coals obtained from 200℃ to 360℃ in a nonpolar solvent of 1-methyl-naphthalene (1-MN) or a high polar solvent of N-methyl-2-pyrrolidinone (NMP) was carried out. The characterization results for bituminous Upper Freeport ashless coals showed that the aromaticity (f_a), aromatic hydrogen to carbon ratio (H_<ar>/C_<ar>), and degree of substitution (σ) were almost similar, regardless of the extraction conditions. For bituminous Illinois No. 6 and subbituminous Wyodak coals, NMP strongly interacted with coal extract during thermal extraction, resulted in high extraction yields, while, when 1-MN was used as extraction solvent, relatively low molecular-weight components were extracted.