Salt formation in the distillation tower
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This post was last edited by jbcyf on 2012-1-21 at 19:46. The pressure drop in our company’s distillation tower is around 35 KPa. 1. The top circulation extraction temperature is only around 135 (it used to be around 145); if this temperature is increased, it will inevitably lead to an excessively high dry point of the gasoline. 2. The dry point of gasoline is difficult to control. 3. The liquid level in the catalytic oil stripping tower experiences slight fluctuations. 4. The tower top temperature is only 104 degrees. 5. Currently, crude steam is used to supply the inlet of the top circulation pump to maintain operation. In summary, can it be concluded that salt accumulation has occurred at the top of the distillation tower, but not to a serious extent yet? What impact will this have on production in the long run? How to handle it? I would appreciate some guidance from an expert.
Based on the pressure drop data, salt deposition has already occurred; it is particularly important to compare this with your previous data. Or, if the pressure drops at the bottom and top of the tower are accurate, and there is no overload, salt formation occurs. Rinse it with water; it will recover in a short time. It’s not necessary to reduce the processing volume, but the diesel will contain water, so make sure to seal it properly. Water can come from anywhere. It is even possible to avoid sending sulfur-containing wastewater outside; the crude gasoline can be treated by washing it with water.
In this case, it’s best to wash it with water.
Increase the top circulation flow rate and return temperature; reduce the cold return flow when there is sufficient capacity in the top circulation pump. If that isn’t possible, reduce the volume used for washing
Salt formation at the tower top is addressed by injecting water at the top of the tower to wash away ammonium salts and prevent salt buildup in the equipment there