During the material removal and replacement process for the maintenance of aromatic hydrocarbon extraction units, what is the best way to proceed in order to ensure the safe conduct of subsequent maintenance work?
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Scenario 1: After the materials from various systems are removed, water is filled into the raw material tank; it then circulates sequentially through the pumps according to the process, and is finally discharged at the bottom of the last tower； Treatment idea 2 for the distillation tower: Water is injected from each reflux tank and then used to flush the tray plates through the reflux pump; finally, distillation of the tower is carried out once there is little clear oil left at the bottom of the tower ； I would appreciate it if experts could provide guidance on how to meet requirements such as using environmentally friendly sealed steam towers and preventing oil from spilling on the floor!
Oil removal – nitrogen purging – steam purging (with recovery of steam condensate); if possible, rinse the extraction distillation column and solvent recovery column with a small amount of water to remove ferrous sulfide. Water must be recovered specially and cannot enter underground pipes.
We are planning to try chemical cleaning
Use self-made coolers or solvent recovery coolers for recycling; strive to recover as much as possible, as this helps reduce energy consumption and also prevents solvents such as sulfolane from causing severe environmental pollution