Hephestus
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Acetic anhydride storage and degrading
Hello to all people
I've had an issue recently with some acetic anhydride degrading in quality to where it's properties are similar to CH3COOH This is been perplexing as
to my storing it.
The acetic anhydride was keep it in glass amber bottle which were then in a dark and cool cupboard. This is the last bits of a batch I got maybe a
year ago at the longest time ago. I'm very careful with it. Yet, this has happened.
I've had a process I've had different results and after much checking of every aspect, I've narrowed it to the anhydride. I obtained a small amount of
a different batch and this problem didn't occur.
Any input would be welcoming
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NZniceguy
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That is odd, ive kept it for months and had no issues but if its just a wee bit left in a big bottle and you live in a fairly humid area, the water
content in the air space in the bottle could perhaps be the cause?
Send some to me and i'll check it for you. 
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DavidJR
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Maybe the cap wasn't sealing properly to prevent moisture ingress?
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Ubya
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Quote: Originally posted by DavidJR
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|| Maybe the cap wasn't sealing properly to prevent moisture ingress?
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most plausible reason, acetic anhydride doesn't go "bad" by itself
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feel free to correct my grammar, or any mistakes i make
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ZetekitoxinAB
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Clean, water free acetic acid anhydride is stable indefinitely if protected from air. In what ways it has properties similar to acetic acid?
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markx
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Hmmm....as far as my experience goes, if one does not deliberately pour water into the container then it shall not "go bad". I had remnants of an
ancient batch in a huge loosely sealed glass bottle. It was stored in a shed for about a year in this condition (and only the Creator knows for how
many decades before my time). No problems at all.
Another small quantity was from the 50s of last century....in original bottle. Again stored in unknown conditions and not tightly sealed, remains very
functional to this day.
Exact science is a figment of imagination.......
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