Expanded Bed Hydroprocessing of Solvent Refined Coal (SRC) Extract. Interim Technical Progress Report on Subtask II, Recycle Operation

摘要

The feasibility of utilizing an expanded bed reactor (LC-Fining Process) for upgrading SRC-I in a recycle model of operation has been demonstrated with respect to conversion of 850 exp 0 F exp + extract and denitrogenation. The objective of this subtask was to demonstrate that equilibrium recycle solvent could be produced without a concurrent accumulation of refractory, recycled 850 exp 0 F exp + material. The recycle run was made in a fashion that provided an exceptionally high conversion of fresh SRC-I material - approx. 87 weight percent. The demanding goal of producing a 0.3 weight percent nitrogen distillate (390 to 850 exp 0 F) was readily achieved at this high conversion level. Equilibrium recycle solvent (500 to 850 exp 0 F) was produced with a 9 weight percent hydrogen content after two consecutive recycle passes. No buildup of refractory material was discernible when recycling a 500 exp 0 F exp + process stream. A calculated catalyst addition rate of one pound of nickel-molybdenum catalyst per ton of moisture free coal gave a gresh SRC-I conversion of 62 weight percent in the recycle mode of operation and 44.5 weight percent in the once-through mode of operation. This catalyst addition rate was effective in producing a superior quality product to that obtained in competing coal hydroliquefaction processes. (ERA citation 05:021636)