This is not strictly a cut but consists of all the light material in the crude absorbed into the total overhead distillate from the crude tower. This distillate, and in most cases, together with similar distillates from other processes form the feed to the refinery’s light end unit. It is in the light end unit that the straight run LPG, light naphtha, and the Heavy Naphtha are separated. However, the end point of the heavy naphtha is determined by the cut point of the overhead distillate and the fractionation between it and the first side stream product from the atmospheric unit.
