Quality control of coarse gasoline

The quality of crude gasoline mainly controls the final distillation point, and the final distillation point of crude gasoline is qualified to ensure the final distillation point of stable gasoline is qualified. The final distillation point of crude gasoline is influenced by the reaction feed, reaction depth, nature of catalyst, temperature and pressure at the top of fractionation tower, top circulation reflux, cold reflux flow, a medium circulation reflux, light diesel extraction and fractionation tower steam volume.

The reaction processing volume increases, the crude gasoline final distillation point increases; the reaction depth increases, the crude gasoline final distillation point increases; the fractionation tower top temperature increases, the crude gasoline final distillation point increases; the fractionation tower top pressure increases, the crude gasoline final distillation point decreases; a medium cycle return flow increases, the light diesel distillation temperature decreases, the crude gasoline final distillation point decreases; the rich absorption oil return tower volume increases, the crude gasoline final distillation point decreases; the amount of steam into the fractionation tower increases, the crude gasoline final distillation point increases. The final distillation point of crude gasoline rises.

During normal production, the final distillation point of gasoline is controlled by the top circulation flow rate and the return tower temperature. If the final distillation point is high, increase the top recirculation flow rate or lower the return tower temperature to reduce the top temperature of the fractionator. If the final distillation point is low, lower the top cycle return flow rate or raise the return tower temperature to raise the top temperature of the fractionator.

When the diesel condensation point is low, the gasoline final distillation point is also low, can be appropriate to increase the return tower temperature of a medium reflux, reduce the return flow rate of a medium cycle, reduce the heat load of each reflux section, improve the final distillation point of gasoline, while also taking into account the diesel condensation point.

When the catalyst activity of the system increases, the tower top temperature should be increased appropriately, but when the activity is too high, the tower top temperature should be reduced in time to control the final distillation point of gasoline.