Reasons for the excessive pressure difference between the top pressure of the initial distillation tower and the pressure in the reflux tank

If the water injection volume is high, what impact does it have on the pressure difference between the two?

Ammonium salt crystallization, causing pipeline blockage‘

Ammonium salt crystallization generally occurs in the cooler behind the atmospheric pressure tower, which leads to pressure buildup due to obstruction in the path downstream of the atmospheric pressure tower; that’s roughly what happens

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Salt deposition occurs on the surfaces of the heat exchanger tubes and the air-cooled tube bundles, leading to blockages and an increase in pressure drop. This is mainly caused by the injection of inorganic amines or by the tower top temperature being set too low, below the salt deposition threshold for ammonium chloride. Increasing the tower top temperature or increasing the amount of water used for flushing may help resolve this issue.

A large pressure difference means that the pressure in the return tank is very low; surely this is because the air coolers and water coolers are not able to cool it down properly