Analysis of the reasons for ethylene glycol discoloration
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May I ask why ethylene glycol turns yellow? No contact with metal.
It’s not clear whether your ethylene glycol contains water, nor are the storage temperature, pressure, purity, and other environmental factors known, so it’s difficult to give an answer. There was a post about this before; for reference: https://bbs.hcbbs.com/thread-1235759-1-1.html
There are many reasons why ethylene glycol turns yellow; ultraviolet radiation from light can also cause discoloration. You need to provide detailed information about your operating conditions or the process used, so that I can analyze the reasons for the discoloration