I am converting maleic acid into maleic anhydride via dehydration in xylene and I would like to determine the impurities in the product. spcifically maleic/fumaric acid content and xylene. as well as maybe some impurities originally in the maleic acid solution.
I thought about melting the anhydride at ~55 degrees (C) trying to collect precipitate, however this has a relatively low sensitivity.
Any suggestions?
Dear Peter Teplitzky
As Professor Frank T. Edelmann answered, the best method is the distillation under reduced pressure. The purity acn be also checked chromotographically.
All the best.
Dear Peter Teplitzky , maleic anhydride can be purified by fractional distillation under vacuum (see attached). You can the check the purity by NMR (1H, 13C).
Dear Peter Teplitzky
As Professor Frank T. Edelmann answered, the best method is the distillation under reduced pressure. The purity acn be also checked chromotographically.
All the best.
Thank you for the answer
A purification method can indeed be useful.
However I am looking of the best method to determine the purity of my Maleic acid distillation on the first place, Yasser Fakri Mustafa can you please elaborate a little further on the chromatography method? solvents and detectors and so on?
Dear Peter Teplitzky
Simply, you can use column chromatography eluted by a mixtures of Chloroform: ethylacetate in the range of 1:3 to 3:1.
All the best
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