How to remove water from 85% orthophosphoric acid [[H3PO4]?

19 January 2022 1 6K Report

My experiment needs anhydrous orthophosphoric acid and we only have a 85% aqueous solution. Any method to dry it? Most of the literature I found deals with purification from metal ions present in the acid. Liquid-liquid extraction tried with toluene and ethyl acetate were inefficient.

Lukas Schulig

Distillation with glacial acetic acid under reduced pressure followed by recrystallization. You could also check some patents for synthesis and purification.

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