... volatile are discharged after combustion of hydrocarbons and purification treatment, so, there is no odor and no environment pollution. Oil Distillation Advantages: ... also you use the coal furnace, the burning material is fuel, natural gas and coal. For the fuel, it can be the ... , it produces less sludge, the sludge is purity carbon materials without any oil, and the sludge can be processed into a ...