Abstract: Dushanzi petrochemical refinery took measures to reduce light waste oil emissions for operating units. The sampling frequency for distillation unit was reduced and the waste samples produced by sampling were recycled. The sealing conditions of equipments were carefully examined; The conditions at debutanization tower top and atmospheric tower top were optimized to increase the initial boiling point of naphtha from 42℃ to 49℃, resulting in reduction of the VOCs emission in naphtha tank area. The light waste oils from units of the refinery were recycled through the circulation line system of the distillation unit and received at the entrance of the crude pump of the atmospheric distillation tower, instead of sending into the middle tanks, thus reducing the VOCs emissions of the plant, effectively improving the plant production environment.

Key words: distillation unit, light waste oil, naphtha, VOCs emission