Solvolysis of Coal by Petroleum Vacuum Residue (V)

Abstract

This paper deals with physical properties of solvolysis pitch which affect on the separation of ash from coal after solvolysis reaction. Softening point of solvolysis pitch and density and ash content of solvolysis pitch, its quinoline insoluble mattent (QI) and quinoline soluble matter (QS) were determined in connection with reaction conditions. The results obtained are summerized as follows.(1) From the solvent extraction of solvolysis pitch, it was found that the increase in softening point of solvolysis pitch obtained at a temperature below 400°C was caused by dissolution of a part of coal into petroleum vacuum residue during heat treatment.(2) The softening point of solvolysis pitch increased with a increase in heat treatment temperature and coal ratio used.(3) The softening point of solvolysis pitch from various ranks of coals at 390°C for 60 minutes took a maximum value at 83% of carbon content of coal.(4) The density of solvolysis pitch and its QS prepared from a part of Miike coal and two parts of Khafji vacuum residue increased gradually with a increase in heat treatment temperature. On the other hand, density of the QI took a maximum value of 1.6 at 390°C and ash content of QI took a maximum value of about 32% at the same temperature, too.