Analysis of the causes of operational imbalance in extraction towers

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Through the chemical reaction of the solvent in the extraction tower, aromatics and non-aromatics are separated; the non-aromatic compounds that settle down serve as feedstock for the stripping tower. The temperature in the stripping tower is around 168 degrees, which allows the non-aromatic components in the aromatics to be vaporized. These vaporized compounds are then cooled to become liquid and returned to the extraction tower (as aromatics). Sometimes, the liquid level in the extraction tower is unstable, as is the pressure in the stripping tower. Reasons for instability in the extraction tower’s liquid level: 1. Material imbalance； 2. Hui Fangfang has a high content. 3. The amount of return fragrance is too high. Reasons for unstable pressure in the stripping tower: 1. Unstable temperature, 2. Unstable feed, 3. Unstable composition. Question: Are there any other reasons for these two situations, given that the solvent is fine?