Discussion on the high acid value of atmospheric distillation columns

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Hello everyone. I’m not sure if anyone has encountered this situation: the parameters of the PH and the pressure tower are normal, but the acid value in the atmospheric pressure tower is high; sometimes its water solubility is also poor. From my own experience in actual operations, I’ve found that: 1) The exhaust gas from the pre-tower might leak into the atmospheric pressure tower, affecting the quality of the product produced there. This happens because, in the design, the exhaust channels of the atmospheric pressure tower and those of the pre-tower are connected. When the check valves in these pipelines fail, it can impact the quality of the product from the atmospheric pressure tower. We can address this by separating the connection between the pre-tower and the atmospheric pressure tower. 2) It’s possible to increase the temperature at the outlet of the condenser in the atmospheric pressure tower as much as possible, thereby ensuring that the tower operates under a slight positive pressure. However, this approach might result in excessive levels of residual liquid. I’d like to ask if there are any other methods everyone might have? ?