Thanks for the links to Gaylord and Jacob, Garnet. I notice that Gaylord calls their process an engineering process that removes all impurities from the DMSO, while JacobLab uses a chemical additive to counter the odor. Gaylord's method may be just distillation - they don't say. The odiferous impurities such as dimethyl sulfide have much lower freezing points, flashpoints and boiling points than DMSO itself. Being therefore more volatile, perhaps these can be driven off by boiling without vaporizing the DMSO. But you are probaby right...if it were this simple, others would have discovered it long ago.
Semiconductor materials are ultrarefined and monocrystallized by zonal melting. I wonder if this is Gaylord's engineering process? Matthew
