ABSTRACT
Atmospheric and vacuum residua are the usual feedstocks to a visbreaker, although tar sand bitumen has long been considered a likely feedstock. The atmospheric and vacuum residua will typically achieve a conversion to gas, gasoline, and gas oil on the order of 10-50% weight, depending on the severity and feedstock characteristics. The conversion of the residua to distillate (low-boiling products) is commonly used as a measure of the severity of the vis breaking operation, and the conversion is determined as the amount of 345 c+ (650)F+) material present in the atmospheric residuum or the
Figure 14.7 The aquaconversion process.
