抄録
Extractions of Shin-yubari, Miike, and Zao Zhuang (China) coals with carbon disulfide-N-methyl-2-pyrrolidone mixture at room temperature for 30min gave high yields (daf) of 55%, 37%, and 60%, respectively. The effects of extraction time, coal/solvent ratio, and particle size of the coal were studied for Shin-yubari coal. The yields for the extractions more than 15min are almost the same (≅55%) The increase of coal/solvent ratios from 2g/100ml to 8g/100ml and the increase of particle sizes from -170 mesh to -16 mesh gave little change to the extraction yields. H/C ratio of the residue from the extraction (53% yield) of Shin-yubari coal was found to be 0.82, compared to 0.87 of the raw coal.
