WordNet sense 1 (made pure):

refined, purified

WordNet sense 2 (free of extraneous elements of any kind):

pure

WordNet sense 3 (make more subtle or refined):

rarefy, subtilize

WordNet sense 4 (remove impurities from, increase the concentration of, and separate through the process of distillation):

distill, purify, make pure

WordNet sense 5 (change or cause to change directly from a solid into a vapor without first melting):

sublime