Methanol distillation tower
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After four years of start-up and shutdown cycles, and especially the prolonged shutdown last year, the distillation tower has not undergone any inspections or cleaning. Now that it is ready to be started up again, what tasks need to be carried out to ensure a smooth operation this time? I would appreciate advice from those with more experience……
If possible, carry out a systematic alkaline cleaning
Thoroughly purge with nitrogen before driving to prevent explosive gases from forming in the subsystem due to air. The treatment of the pre-tower is crucial. When the system is fed, as long as there is a liquid level in the pre-tower, the reboiler should be activated; the vent temperature of the pre-tower can be increased to around 60 degrees.
Displace with nitrogen, and check it with a combustible gas detector
It should be completely rusted by now; it can be cleaned with an alkali solution first