Co-refining of coal and petroleum
The potential of five petroleum residues as feedstocks for co- processing with a UK bituminous coal is assessed. The petroleum fractions, comprising two atmospheric and three vacuum residues, originate from the Middle East, the North Sea, South America and Alberta. The coal used is Point-of-Ayr coal. In a simulation of the British Coal Corporation's two-stage liquid solvent extraction process, the residues are first examined as prospective solvents in the extraction stage. Coal conversions vary from 6 to 37%, depending on the residue used and reaction conditions. These yields compare poorly to those obtainable with coal-derived solvents. Best yields are obtained from residues with a high asphaltene content or a high (aromatic and polar) content in the maltene fraction. In two isolated cases, catalytic prehydrogenation of the petroleum residue improves conversion, to ca. 65%, but this result is not reproducible. One-stage coprocessing of the coal with the residues, in which the co-reactants are hydrocracked at 450 C and 12 MPa hydrogen pressure, is much more successful. Coal conversions of about 75% are obtained under optimum conditions. Conversions under one-stage coprocessing are insensitive to the nature of the residue.
Bibliographic Reference: EUR 12825 EN (1990) 40 pp., MF, ECU 4
Record Number: 199010750 / Last updated on: 1994-12-01
Original language: en
Available languages: en