centrifugal molecular still [´sen`trif·i·gǝl mǝ`lek·yǝ·lǝr `stil] CHEMICAL ENGINEERING A device used for molecular distillation; material is fed to the center of a hot, rapidly rotating cone housed in a chamber at a high vacuum; centrifugal force spreads the material rapidly over the hot surface, where the evaporable material goes off as a vapor to the condenser. |