부산대학교 도서관

This paper is part of a series of papers directed to inform the research community of the major achievements obtained during the development of the Integrated Two-Stage Liquefaction (ITSL) process and recent results from a few research laboratories which are closely related to the ITSL approach. The conclusion derived from these achievements is that the low-severity approach, exemplified by the ITSL process, has shaped a new direction in direct coal liquefaction development which needs further complementary support work of manifestly fundamental nature. This paper intends to demonstrate that low-severity coal liquefaction operations are instrumental in producing some uniquely structured hydrocarbon distillate products. While the structure of these hydrocarbons can be traced to the unique condensed cyclic hydrocarbon structure present in coals, the low-severity operations, practiced in staged coal liquefaction processes, are the main contributors to the maintenance of the cyclic structure throughout and up to the final distillate products.