Middle distillate hydro-treating

The SRC-II process is one of several coal liquefaction processes currently under development in programs funded by the Department of Energy (DOE). Product from this process is a distillate that is relatively attractive as a feed for conversion to transportation fuels. Essentially all of the nitrogen, sulfur, and oxygen can be removed in a single catalytic hydro-treating stage to yield a naphtha that is an excellent feed for a catalytic reformer and a middle distillate fraction that is a... 

Hydro-treating of the middle distillates must be accompUshed to reduce sulfur for the obvious environmental concerns as well as to eliminate downstream processing problems. Hydrogenation of sulfur compounds over cobalt-moly or nickel-moly catalyst is generally of the first-order kinetics with respect to the sulfur compounds. Thiophenic sulfur is more difflcult to hydrogenate than sulfides, disulfides, and mer-... 

The middle distillates were hydro-treated under conditions of 1000 psig, 1000 SCF H2/bbl, 3 LHSV, and temperatures ranging from 450 -700°F in 50 F increments. Again, desulfurization, denitrogenation, and gravity changes were profiled utilizing American Cyanamid HDS-3A nickel-moly catalyst. 

Table V presents the tabulated experimental results of hydro-treating the middle distillates. Desulfurization results reveal at least 96% sulfur removal at 700 F for all three middle distillate materials. Nitrogen...

Table V. Characterization of Hydro-Treated Middle Distillates...

Generally, the program consisted of the hydro-treating of naphthas, middle distillates (400°-650°F), and heavy distillates (650°-975°F) derived from coal liquefaction (H-Coal), shale oil liquefaction (TOSCO II), and petroleum. 

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