Hydroprocessing blends

HYDROPROCESSING OF 33% BLEND OF SHORT-CONTACT TIME SRC (Pressure 13790 kPa NiMo Catalyst)... 

Short contact time SRC can be upgraded via catalytic hydroprocessing into low sulfur boiler fuels. However, the solid SCT SRC feedstock requires solvent dilution to reduce its viscosity. Furthermore, even for a 50 wt % W. Kentucky SCR SRC blend, all pilot unit lines and valves have to be heat-traced above 350°F in order to achieve smooth mechanical operations. 

Table 1 gives a comparison of two operational modes practiced in residue hydroprocessing MHC and HDS. In the MHC mode of operation, usually heavy feedstock is processed at a relatively high liquid space velocity and temperature to produce maximum middle distiUate. The desulfurized bottoms are fed to a vacuum tower to produce FCC feedstock, are used as a blending stock for... 

The above result, that the antioxidant response in two-stage hydroprocessed oils is clearly better than in solvent-refined base stocks, has recently been confirmed [76]. It was demonstrated that phenolic-based formulations, blended into two-stage hydroprocessed oils, gave the greatest oxidative stability when total and polynuclear aromatics were lowest. Most fully formulated turbine oils make use of the synergistic interaction between phenolic and aminic antioxidants, see Reaction (4.70). Thus, depending on the performance requirements and the base oil composition, phenol/amino ratios of 1 1 to 4 1 are used [77],... 

---