How should waste methanol from low-temperature methanol washing be treated? ?
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How does everyone handle the waste methanol used in low-methanol processes? Can it be added to pure methanol and sold, or sent back for distillation? ? ?
Low-temperature methanol washing allows for regular removal and replenishment of methanol, with the removed methanol being able to return to the distillation system! I’m not sure what you mean by ‘waste methanol’ – generally, we are referring to the methanol contained in the wastewater at the bottom of the methanol-water separation tower; we send this methanol-water mixture to the coal slurry preparation process!
Yes, I’m referring to low-purity methanol. Currently, the levels of sulfur and ammonia are a bit high, and it’s not clear what to do with the methanol that is returned. If it’s added to the distillation system, could it cause corrosion in that system? ?
Of course, it cannot be discarded; partial distillation must be carried out and the sulfur and ammonia contained within it must be removed in order to reduce their levels in the system. Sulfur can be removed through separation methods, while ammonia can be eliminated by absorbing it with water.
Reply to 3# Drop of Water Seeing the Sea: System ammonia discharge can be carried out by slightly opening the bypass of the heat exchanger in the sulfur recovery unit for the acidic gases from the regenerator, thereby discharging the ammonia in the system to the sulfur recovery incinerator! Increase the steam supply to the regeneration tower appropriately to enhance the regeneration effect! Under normal circumstances, it will get better in one to two weeks!
Methanol with a high ammonia content can be sent to the recovery tower of the distillation system for recovery.
This post was last edited and replied to by See the ocean through drops of water on 2011-5-30 17:12. Reply to 6# 654262293: If that’s the case, ammonia will end up in the three towers. Could you explain in detail how to proceed?
Reply to 7# DrippingWaterViewingTheSea: Doesn’t your recovery tower have a condenser at the top? Go straight to the atmospheric pressure tower? Some manufacturers sell methanol with a high ammonia content as fusel oil, which seems a bit wasteful.
Yes, it might be better if the recovery tower is isolated separately! May I ask how you do it?
Proceed with the separation; after that, just drain the water!
How high is the ammonia content in yours? If it’s high, it’s necessary to investigate its source. Generally, ammonia and methanol operate in separate systems. If the ammonia level isn’t high, distillation can be used for separation, or the mixture can be sent to a distillation system for treatment of fusel oils; the same distillation process is applied even after the mixture is taken out