Hydrotreated yields from

Table VII shows the estimated yields from an SCT-SRC plus hydrotreating scheme along with published yields from SRC-I (5), SRC-II (6) and H-coal Syncrude (7) processes. The yields for the SCT dissolution operation at Wilsonville (8) are also included...

YIELDS FROM SEVERE HYDROTREATING OF ILLINOIS H-COAL, WYODAK H-COAL, AND SRC-II SYNCRUDES ... 

YIELDS FROM HYDROTREATING RERUN ILLINOIS H-COAL PRODUCT OVER ICR 106... 

Figure 4. Catalytic cracking yields from hydrotreated feeds. Shale oil arm Arabian Light vacuum gas oil at 975°F (O), shale oil containing 870 ppm N (0), shale oil containing 385 ppm N.

Although hydrotreating increases the percentage of sulfur in coke and slurry, the actual amount of sulfur is substantially less than in the nontreated feeds. Sulfur still plays a minor role in unit conversion and yields. Its affect on processing is minimal. Some aromatic sulfur compounds do not convert, but this is no different from other aromatic compounds. They become predominately cycle oil and slurry. This tends to lower conversion and reduce maximum yields. 

The performance analysis and product analysis results confirm previous findings (3,8) that hydrotreating improves the quality of catalytic cracker feedstock and the resultant products. In addition, it was shown that the quality of the liquid products and the yields of the coke and the heavy cycle oil (HCO) from cracking of the severely hydrotreated feedstock (WM-2-9) were independent of the conditions of the cracking process. These results imply that there exists a degree of pretreatment hydrotreating above which... 

Effective hydrotreating removes sulfur, nitrogen, and oxygen from products yielding H2S, NH3, and H20, respectively. Incomplete hydrotreating can produce mercaptans, amines, and alcohols. Although rare, carryover of these compounds into finished products can lead to copper corrosion, instability, or odor problems. 

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