How do I remove water from formic acid?

Purification of Formic Acid According to : Purification of Laboratory Chemicals , Sixth Edition

"Anhydrous formic acid can be obtained by direct fractional distillation under reduced pressure, the receiver being cooled in ice-water. The use of P2O5 or CaCl2 as dehydrating agents is unsatisfactory. Reagent grade 88% formic acid can be satisfactorily dried by refluxing with phthalic anhydride for 6hours and then distilling it. Alternatively, if it is left in contact with freshly prepared anhydrous CuSO4 for several days about one half of the water is removed from 88% formic acid; distillation then removes the remainder. Boric anhydride (prepared by melting boric acid in an oven at a high temperature, cooling in a desiccator, and powdering) is a suitable dehydrating agent for 98% formic acid; after prolonged stirring with the anhydride the formic acid is distilled under Vacuum. Formic acid can be further purified by fractional crystallisation using partial freezing. [Beilstein 2 IV 3.]"

With that amount of water, I suggest that you should try with an absortbent such as zeolit, sulphate salt or superabsorbing polymer, etc.

Many thanks for your answers, I´ll try it and I´ll let you know.

Hello again, I´ve tried with zeolit and you can see the result on the photo. There is a kind of fog between zeolit and formic acid (uploaded file). I have tried with other formic acid and it happens the same, so I decided to try with other acids from the same family (trifluoroacetic acid, propionic acid and acetic acid) and nothing appears on the solution. Do you have any idea what it can be?? I´ll try to make some experiments to know what is it...

mjjlk;kik;k,

i loooove formic acid