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3578014 
Journal Article 
Study of the interaction of aromatic compounds with coals by inverse liquid chromatography 
Kaneko, H; Morino, M; Takanohashi, T; Iino, M 
1996 
Yes 
Energy and Fuels
ISSN: 0887-0624
EISSN: 1520-5029 
AMER CHEMICAL SOC 
WASHINGTON 
10 
4 
1017-1021 
English 
WOS:A1996UY20500022 
Inverse liquid chromatography using the extraction residue which was obtained from the extraction with a carbon disulfide-N-methyl-2-pyrrolidinone (CS2-NMP) mixed solvent at room temperature was carried out. The capacity factors (the increment of the elution volume of probe relative to the elution volume of the carrier solvent) of various aromatic compounds were higher than that of a carrier solvent used and increased with an increase in the size of condensed aromatic rings, suggesting that the separation is carried out by the sorption mechanism and not by size exclusion. The capacity factors of substituted anthracenes (methyl-, ethyl-, tert-butyl, phenyl-, and diphenylanthracenes) were found to decrease with an increase in their bulkiness, suggesting that the substituted groups on an anthracene ring hinder the access of the anthracenes to the interacting sites in coals. The extraction residue with a higher extraction yield showed a larger difference in the capacity factors between benzene, naphthalene, and anthracene than that with lower extraction yield from the same coal. The column packed with coal extract also gave similar elution orders for aromatics as those for the residues, suggesting that in addition to the interactions between aromatic compound-coal pore surface, those between aromatic compound-coal bulk, i.e., diffusion (absorption) into coal bulk, are important, since the extract fraction does not seem to have much of physical pores.