Dear scientists,
My acetic acid solvent contains 1000 ppm acetic anhydride. I want to reduce it to 0 ppm. what process I should do? - I have tried atmospheric distillation but it was reduced to 600 ppm. Please suggest.
The excess acetic anhydride can be removed by distillation at atmospheric pressure, and the residue is distilled under reduced pressure through a short (15-cm.) http://www.orgsyn.org/demo.aspx?prep=CV4P0790
Check https://patentimages.storage.googleapis.com/54/e3/b1/2c908592528119/EP0087870A1.pdf
Chinaza Godswill Awuchi Boiling point of acetic anhydride is high as compare to acetic acid. distilling it at atmospheric pressure will distill only acetic acid and some traces of acetic anhydride with it (because of mass transfer challenge). It will not solve my objective of 100% removal of acetic anhydride. is there any other way to add any reagent that will only react with acetic anhydride and make it to 0 ppm and act as inert to my main solvent acetic acid.
Hello Pawar,
Kindly check on this paper.
https://www.mdpi.com/1420-3049/26/11/3219/pdf
Dear Virendra,
this is also a very interesting technical question. In this case, too, I have a rather unconventional suggestion. You could add the calculated amount of water which is required to convert the acetic anhydride to acetic acid. This should be achieved by heating the mixture for a while. If it works, there will be no need for any further distillation! Just give it a try! 😎
Good luck and best wishes!
P.S. I also suggest to try this method first with e.g. 1 liter of your anhydride-contaminated acetic acid and see how it works.
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