Has anyone ever noticed if molecular sieves are slightly acidic? I require some dry DMF and am concerned that the acidic residue from the sieves may affect the purity of the solvent.
I have the suspicion that sieves are slightly acidic, as I tried to make some dry ethyl vinyl ether by storing over 4Å sieves, and within a few hours the solution was noticeably more viscous, and after 2-3 days, the solution was a gel. I suspect the vinyl ether polymerized due to acid in the sieves.
Anyone else had problems with sieves?