Vacuum flashed cracked residue

The feedstock for the SGP unit is a heavy, vacuum-flashed cracked residue from an existing visbreaker unit. This material is typically characterized by high viscosity and high metal content. 

For conventional VGO cracking the sharpness of the vacuum separation between the flashed distillate and residue is not really important, provided that the undesirable non-volatile asphalthenes and metal compounds are left in the residue. 

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