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The thermal upgrading of two residual oils with different characteristics was studied in a laboratory-scale continuous delayed coking unit.The goal was to investigate the influence of the process variables such as temperature,reaction time and additive on liquid yield and products distribution.A maximum liquid yield of 73% was achieved compared to 69% with the commercial unit.This yield was even increased to 75% under the effect of an additive.The fractionation of liquid oil by simulated vacuum distillation showed a high yield of diesel(46.9%).compared to 28% for the commercial unit.