It is important to obtain the basic data for evaluation and utilization of coal liquid vacuum residue (CLVR) from economical viewpoints in coal liquefaction technology. The purpose of this study is to clarify the characteristics of solvent-frac-tionated components of CLVR and the influence of raw coals on them. Samples used were five kinds of CLVR obtained from the continuous 0.1t/d coal liquefaction plant (BSU) of NEDOL process.
The following conclusions were derived from the measurement of 1H-NMR spectra, molecular weight, elementary analysis data and extraction yields of solvent extracts of CLVR.(1) CLVR derived from lower rank coal had a tendency to contain a larger quantity of light organic components (n-hexane solubles, HS).(2) CLVR from the coal giving a higher liquid yield contained a larger quantity of HS and a smaller quantity of asphaltene.(3) N/C and O/C values of heavy organic component of CLVR were generally proportional to those of the raw coal respectively, and their values increased as the solvent-fractionated component became heavier except N/C of THE insoluble.(4) The ratio of naphthenic to total rings in the extracts of CLVR decreased with increasing rank of the raw coal.
