Discussion on liquefaction reactivity of lithotype and maceral of low rank coal

In this paper, the liquefaction reactivity of the lithotype and maceral of low rank coal was studied in autoclave when solvent and catalyst were used in the hydro-liquefaction test. The experiment results indicate that the conversion and the oil yield are in the sequence of vitrain, clarain, durain and fusain for macro-lithotype of coal. At the same time, for micro-maceral, not only vitrinite, exinite have activity, but also semi-vitrinite has certain activity, and the content of the active component (vitrinite, semi-vitrinite, exinite) increases linearly with the conversion and the oil yield. Semi-fusinite has activity in liquefaction when the reflectance is less than 1.5%, but its activity is less than that of semi-vitrinite in the same coal, and inertinite does not have any activity when the reflectivity is more than 1.5%.