One- and two-stage coprocessing of coal and petroleum residues

W. Steedman, T. Flynn, W. Kemp, K. D. Bartle, N. Taylor, S. Wallace

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The potential of two atmospheric and three vacuum petroleum residues as feedstocks for coprocessing with a UK bituminous coal has been assessed. In a simulation of the British Coal Corporation's two-stage liquid solvent extraction process, the residues were first examined as prospective solvents in the extraction stage. Coal conversions varied from about 6-37%, the best yields being obtained from residues with a high asphaltene content or a high (aromatic and polar) content in the maltene-fraction. These yields compare poorly with those obtainable with coal-derived solvents. In two cases, catalytic prehydrogenation of the petroleum residue improved conversions to about 65%, but these results were not reproducible. One-stage coprocessing at 450°C and 12 MPa hydrogen pressure was much more successful. Coal conversions of about 75% were obtained at optimum conditions. Conversions under one-stage coprocessing were insensitive to the nature of the residue.

Original languageEnglish
Pages (from-to)299-307
Number of pages9
JournalInternational Journal of Energy Research
Issue number2
Publication statusPublished - Mar 1994
EventProceedings of the EC Conference - Palermo, Italy
Duration: 1 Oct 19901 Oct 1990


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