Process and apparatus for making ultra-pure dmso

Details Process and apparatus for making ultra-pure dmso Process and apparatus for making ultra-pure dmso

C - Chemistry, Metallurgy

07

C

C07C 315/06 (2006.01) C07C 317/04 (2006.01)

Patent

CA 2371283

One aspect of this invention relates to processes for solidifying dimethylsulfoxide including a step of partially solid-ifying a liquid phase including dimethylsulfoxide and one or more impurities, to form a mixture comprising solid dimethylsulfoxide and a liquid residue. In certain embodiments of the processes of the invention, ultra-high purity DMSO that exceeds the purity spec-ifications for U.S.P. grade DMSO can be produced by employing solidification, fractional solidification and/or melt crystallization processes.

Un aspect de cette invention concerne des procédés de solidification de diméthylsulfoxyde, comprenant une étape de solidification d'une phase liquide contenant du diméthylsulfoxyde et au moins une impureté, en vue de créer un mélange renfermant du diméthylsulfoxyde solide et un résidu liquide. Selon certains modes de réalisation des procédés de cette invention, du diméthylsulfoxyde à pureté ultra-élevée qui dépasse les spécifications de pureté de diméthylsulfoxyde de la classe USP, peut être produit en utilisant des procédés de solidification, de solidification fractionnée et/ou de cristallisation en fusion.

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