I seek advice and help from my colleagues; the desulfurization tower using MDEA for liquefied gas is suffering from severe catalyst fouling, and I am looking for solutions.

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This desulfurization tower is a packed tower; the lean liquid flows from top to bottom, while the liquefied gas flows from bottom to top. After this maintenance work was completed, the operation of the desulfurization tower became unstable, with severe carryover of agents. Specific manifestation: In actual operation, the lower limit plate is used to control the level, but the upper limit plate always maintains a certain level; the value indicated by the upper limit plate is clear (for example, if 50 centimeters is indicated as the level, then there is about 10 centimeters of dark area above that level), with no foam or other impurities. Regardless of what happens, the level on the upper limit plate is still visible. It is suspected that there may be a blockage in the packing tower. I hope my colleagues will not hesitate to offer their guidance.