14.石炭の溶媒抽出率に及ぼす添加物の影響

抄録

The effect of addition of tetrabutylanmoium salts on the extraction of seven different kinds of coals with carbon disulfide-N-methyl-2-pyrrolidinone (CS_2-NMP) mixed solvent (1:1 by volume) was investigated. Addition of some salts considerably increased the extraction yield of some coals. For Upper Freeport coal, in particular, the addition of a very small amount, 0.25mol/kg-coal of tetrabutylammoniumfluoride increased the extraction yield from 59.8 to 83.9%. The effect of anion types on the extraction yield was also examined. It was found that the polarizability of anion is responsible for the increment of the extraction yields. The fractionations and FT-IR analyses of the extracts indicate that the extracts produced with the additive contain heavier and aromatic-richer constituents than that without additives.