Acetone can be dried with molecular-sieve pellets type 3A or 4A, or either with anhydrous CaSO4 (for 'Drierite' without indicator: 25 g/dm3; > 1 h) or K2CO3; decanted or filtered; and preferably distilled with a smaller quantity (< ½) of fresh desiccant. 'Drierite' seems the most recommended desiccant for acetone. Dry acetone is rather hygroscopic. Nearly anhydrous acetone (~ 0.05 wt% H2O) is commercially available. Further details on desicant efficiency for acetone can be found at:

Article Desiccant efficiency in solvent drying. 3. Dipolar aprotic solvents

Hi,

are you familiar with this research work?

Upgrading Recycled Acetone to 100% with Molecular Sieves

http://journal.plastination.org/archive/jp_vol.25.2/jp_25.2_Dec13_pages27-32.pdf

B.R.,

Ari