Expanded Bed Hydroprocessing of Solvent Refined Coal (SRC) And Short Contact Time (SCT) Extracts. Final Technical Progress Report

摘要

Process Development Unit studies have been made to demonstrate the use of Lummus/Cities-Fining (LC-Fining) expanded bed hydroprocessing technology to upgrade solvent-refined coal extract (SRC). Three SRC and two short contact time (SCT) extracts, defined as 850 exp 0 F+ materials, were processed. One SRC, which initially contained 0.8% sulfur and 2.0 wt % nitrogen, was upgraded to distillate products which contain < 100 ppM sulfur and 0.3 wt % nitrogen using a NiMoly catalyst. Ninety percent conversion of SRC to distillates has been obtained in recycle operation. Additional work was undertaken to investigate the effects of processing with a higher boiling solvent (680 exp 0 F versus 500 exp 0 F). Both a 50/50 and a 70/30 SRC/solvent feed blend ratio have been run. SRC from Western coal, and SCT coal extract prepared at Wilsonville (both deashed and non-deashed) have been tested. Expanded bed processing of coal extracts in the various modes described above has been demonstrated to be completely feasible and desirable to produce low nitrogen distillates (390 to 850 exp 0 F). The technical information derived from this work is being used in support of a two-stage liquefaction program. Hydrocracking of the SRC/SCT coal extracts in the presence of a selective catalyst and under optimum conditions of temperature and space velocity enhanced the production of middle distillate liquid fuels, minimized the formation of light hydrocarbon gases, and optimized the overall utilization of hydrogen. (ERA citation 08:008908)