Upgrading of Coal Liquids for Use as Power Generation Fuels. Final Report, February 1978-June 1979

摘要

Residual coal liquids were hydroprocessed in a fixed bed unit to upgrade them to power generation fuels. A series of catalysts was evaluated for the desulfurization of short contact time (SCT) SRC. Low sulfur (0.4 wt %) boiler fuels were produced with hydrogen consumptions as low as 800 and 1200 scf/B from Indiana V regular SRC and W. Kentucky SCT SRC, respectively. Constant temperature aging runs were conducted with both regular and short contact time SRC. A kinetic aging model was developed to estimate process conditions and yields in either a fixed bed or ebullated bed reactor. Chemical characterization indicated that W. Kentucky SCT SRC molecules are significantly larger and more polar than those of Indiana V regular SRC. The high conversion of asphaltenes to less polar material does not appear necessary for SRC desulfurization. A structural comparison was made between SCT SRC recycle solvent and hydroprocess-generated solvent to assess the potential of process solvent in an integrated short contact time SRC/hydrotreating scheme. The alkali metals found in SRC distillate were determined not to be organically bound and are easily removed by water washing or distillation. A heating value correlation was developed from a wide range of raw and hydroprocessed coal liquids, based on elemental composition. (ERA citation 05:023439)