37. Cross-Linking Structure and Solvent Extraction/De-ashing of Various Ranks of Coals

Abstract

Solvent extraction/de-ashing process (HyperCoal production) is being developed in Japan. The extraction yield is strongly dependent upon physical cross-linking structures in raw coals, since the mechanism of solvent extraction is directly attributed to relaxation of aggregated structures through noncovalent interactions, such as π-π interactions and hydrogen bonds. Nature of physical cross-linking structures of various ranks of coals is discussed on the basis of results of solvent extraction/de-ashing.