I need to dry acetonitrile that we have in the lab. Vogel (4th Ed.) suggests the use of molecular sieves (4A)/silica gel (what mesh size, does anyone know?) for preliminary drying followed by treatment with calcium hydride.
How do I pre-treat these molecular sieves? We don't have calcium hydride in the lab so I googled and found an alternative - P2
. But I don't know how to go about using P2
- do I need a certain amount w.r.t. the amount of solvent I take? Are there some precautions I need to take?
I also read somewhere that I could distill my solvent with benzene whereby I'd get the benzene-water azeotrope. Is that a do-able technique for getting dry acetonitrile?
Or, well, if there is a different method that would work?