How to depolymerize acetaldehyde?
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How to depolymerize acetaldehyde? I heard that acetaldehyde is easy to polymerize, but I don’t know how to depolymerize it? Please help me! Not very grateful! ! !
Adding acid can depolymerize, dilute acid can
Oh my gosh, someone please regulate this. Regarding the self-polymerization of acetaldehyde, some people say it is dilute acid, some people say it is chloride ions, and some people say it is iron ions. Now, dilute acid is also added for depolymerization. Which one is correct?
This post was last edited by rezset on 2009-5-15 10:38. I don’t know what state, stage and purpose of depolymerization you are talking about? In an acetaldehyde storage barrel, you want to degrade the polymer in the barrel? Basically, it's not feasible. It can only be frozen at -5~5℃ during storage to reduce the occurrence of self-polymerization. (Acid will accelerate the self-polymerization of aldehydes) If the crystalline powder of polyacetaldehyde (tetramer) is heated to about 112 degrees, it can sublimate and self-decompose. Polyacetal itself is unstable, and light and heat can cause it to self-depolymerize.
Put the polymer into the distillation tower, add acid, such as hydrochloric acid or sulfuric acid, and depolymerize under heating. At the same time, the polymer is fed for distillation, and acetaldehyde can be obtained from the top of the tower. If pressure is used during the depolymerization process, the effect will be better.
You can check the relevant information on the depolymerization of acetaldehyde, and you can also get the corresponding acetaldehyde solution, such as ethanol solution, etc. Just deaggregate whatever you want to use it for.