While the precise amount of mol. sieve will vary depending on its water absorption capacity, the amount of water to be removed and other factors, generally a contact time of from 1 min. to 1 hour at temperatures of 0 ??? to +50??? C., employing from 1 to 500 gms. of NCM per gram of 3 Angstrom molecular sieve will be sufficient to decrease the H2 O level to <20 ppm for a NCM liquid containing about