Solvolysis of Coal by Petroleum Vacuum Residue

Abstract

In order to investigate behaviour of coal in petroleum vacuum residue, mixture of two parts of Khafji residue and a part of coal was heat-treated at temperature range of 400-450°C for 60 min. Pitch produced was fractionated by benzene and quinoline, and was observed by using a polarized-light microscope.
The results obtained were as follows,
1) From change of amounts of the quinoline soluble matter with heat-treatment temperature (HTT), it could not be recognized that coal in petroleum vacuum residue disintegrated itself into the quinoline soluble matter.
2) In the case of Miike and Takamatsu coal, coal particles in the pitch were covered with mesophase spherules formed in petroleum vacuum residue. In the case of Miike and Nishikawachi coal showing optically anisotropic structure under heat treatment, anisotropic parts in coal particles and in petroleum vacuum residue were indistinguishable clearly in the pitch heat-treated at 450°C.