Simulation with Different Vacuum Residues as Feedstock

1 Simulation with Different Vacuum Residues as Feedstock 

The gasification model was applied to four vacuum residua with boiling range higher than 538°C+ (1000°F+), obtained by TBP (true boiling point) distillation of various crude oils  

The proximal and elemental analyses of these residua are shown in Table 4,6. Crude oils of 10, 13, and 21°API are virgin oils, while 25°API crude is an upgraded oil obtained by catalytic hydrotreatment (Ancheyta et al., 2010). 

With these four vacuum residua it is possible to evaluate the effect of the type of feed to the gasifier, and also the effect of using a VR coming from crude oil hydrotreatment. The results of the simulation using these four feeds at identical operating conditions are reported in Table 4.7. 

It is noted that the VR from the 25°API crude oil produces more CO and H2 and less CO2, H2O, and H2S. The 25°API crude oil has higher hydrogen content and lower content of impurities (sulfur, metals, etc.) as compared with virgin crude oils because of its previous hydrotreatment due to this its VR is a better feed to gasification in comparison with VR coming from virgin crude oils. In addition, since VR from 

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