Abstract
Solid- and liquid-state 13 C n.m.r. measurements were made on a suite of samples obtained from different stages of a coal liquefaction run at the Wilsonville Two-Stage Advanced Coal Liquefaction Research and Development Facility. The n.m.r. measurements were combined with elemental analysis and mass balance data to measure aromatic carbon balances and hydrogen utilization for Wilsonville coal liquefaction run 259G. This was a catalytic/catalytic integrated two-stage liquefaction run on a deeply cleaned, Pittsburgh seam, high volatile bituminous (hvAb) coal from the Ireland mine in West Virginia, USA. The n.m.r. measurements showed that on the basis of the feed coal, about 58% of the aromatic carbons in Pittsburgh coal were hydrogenated during two-stage liquefaction, and 55% of the hydrogenation occurred during the second stage. A net of 68.1 mol of hydrogen per 100 mol of coal carbon was consumed during the first stage of Wilsonville run 259G. This amounted to 69% of the total overall two-stage hydrogen consumption. Matrix cleavage and hydrogenation reactions accounted for 31% and 27%, respectively, of the total first-stage hydrogen consumption. Hydrogenation reactions accounted for most (69%) of the hydrogen consumed during the second stage, and accounted for 40% of the overall two-stage total hydrogen consumption. Most of the total hydrogen consumed for hydrocarbon gas generation (70%), and for heteroatom removal and heterogas production (71%) occurred in the first stage. Overall hydrogen consumption was 14% for hydrocarbon gas production and 27% for heteroatom removal and heterogas production.
Published Version
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