溶媒抽出後の残渣炭の粘結性
1986 年 65 巻 6 号 p. 389-393
詳細
1986 年 65 巻 6 号 p. 389-393
Caking property, such as Roga index and crucible swelling number, of the residual coals from the extractions was measured. The extractions were done using 1: 1 mixtures of carbon disulfide with pyridine, N, N-dimethylacetamide, and N-methyl-2-pyrrolidone, respectively. The following results were obtained.
1) Roga indexes of residual coals from the extraction with the mixture were higher than those for the Soxhlet extraction with pyridine, in similar extraction yield. This may be attributed to a slight oxidation in Soxhlet extraction, since careful air removal from the Soxhlet apparatus gave similar high Roga indexes with those for the extractions with the mixture.
2) In the extractions of Shin-yubari and Zao Zhuang coals with the mixtures Roga indexes of both residual coals decreased with increasing extraction yields. Zao Zhuang coal showed pronounced decrease in Roga index than Shin-yubari coal. This indicates that both coals are different from each other in chemical structures, molecular weight distributions, and degrees of cross-linking, although they have similar carbon content (%)
