Why is the aldehyde level high at the distillate outlet of the ethylene glycol purification tower?
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When ethylene oxide is used in the aqueous method to produce ethylene glycol, why is the level of aldehydes at the distillate outlet of the purification tower consistently high? The dehydration system can also remove aldehydes, but the aldehyde level is high at the side stream of the purification tower. Vacuum leakage has been basically ruled out; what other factors could cause the formation of aldehydes? For example: What catalyst is used to convert ethylene glycol into an aldehyde at high temperatures? ?
Check if there is rust in the system, and clean the filters at each point