1.The first step in petroleum refining is fractional distillation. Crude Oil Product Unit/Use Distillation: Temp(F): Recovered: Sentto: <90° Butane Gas The First Step Lighter Processing 90-200°- Light Straight Gasoline Naphtha Blending 200360°-Naphtha Catalytic Reforming Crude Oil 350-450°-Kerosene Hydro- Treating 450-650°-Distillate Dist.Fuel Blending 650-1000° Heavy Fluid Catalytic Gas Oil Cracking 1000+0- Residuum Coking 1. The first step in petroleum refining is fractional distillation