Does ethylene glycol turn black? How to deal with it?
Thread Content
After ethylene glycol is used as a reaction material and the reaction proceeds for a period of time, its color gradually changes from brownish-yellow to dark green. The pipelines through which the reaction material flows are made of carbon steel; what could be the cause of this? Are there any good methods for decolorizing and recovering ethylene glycol?
Secondary hydrogenation refining, or use resin once
What other reaction media are there besides ethylene glycol?
We have developed a process for recovering ethylene glycol from brown-colored materials; I’m not sure if it’s similar to yours
The main issue here is incomplete reaction of ethylene glycol, along with recycling; we don’t have a recovery system in place yet, but this problem has occurred during laboratory trials, so we’re quite concerned.
To recover ethylene glycol from an aqueous solution of it, it is not possible to simply use vacuum distillation to obtain the liquid at the bottom of the distillation column. Doing so would cause the ethylene glycol product to be exposed to heat for an extended period, leading to reactions; this is one of the reasons for the discoloration of ethylene glycol. However, the main reason for discoloration is usually the presence of other components in the ethylene glycol liquid, which change color when heated. It is advisable to use the distillate as the recovered ethylene glycol, and it is important to select an appropriate distillation temperature. Water has a very low boiling point, while polymers are difficult to distill at high temperatures; generally, substances with dark colors also remain at the bottom of the mixture.
Hello, I work in the antifreeze industry. Why does industrial-grade ethylene glycol turn black when heated? I see you have already published one; I downloaded it but am unable to open it. I would like to ask if chemical additives can be used to prevent ethylene glycol from turning black when exposed to high temperatures. Could you please add me on WeChat to give me some guidance? Thank you very much. My WeChat ID is zhangcom999
Industrial ethylene glycol turns black when heated to high temperatures. What additives can be used to prevent this blackening? I would be extremely grateful if experts could provide some advice. My WeChat ID is zhangcom999; thanks in advance
Ethylene glycol turns black when heated to high temperatures, possibly due to reactions or polymerization.