Dimethyl sulfoxide (DMSO) DISTILLATION

DMSO is recovered from diluted aqueous solution by distillation, taking advantage of the relative volatility difference between DMSO and water. The feed stream is first concentrated in a section using multiple effects technology, concentrated DMSO is then distilled and purified in a separated section. This column works under high vacuum to let the bottom temperature stay below 120°C, avoiding DMSO degradation, Tails containing high boiling are treated in a squeezing unit to improve DMSO recovery yield. The technology is very similar to the NMP recovery by distillation ( see relevant description): hereunder a simple double effect plant: