One aspect of this invention relates to processes for solidifying dimethylsufoxide including the steps of partially solidifying a liquid phase including dimethylsulfoxide and one or more impurities, to form a mixture comprising solid dimethylsulfoxide and a liquid residue, and substantially separating the solid dimethylsulfoxide from the liquid residue, wherein the liquid residue comprises liquid dimethylsulfoxide and at least a portion of the impurities, and wherein the liquid residue is not subsequently treated by any step of partial solidification. In certain embodiments of the processes of the invention, ultra-high purity DMSO that exceeds the purity specifications for U.S.P. grade DMSO can be produced by employing solidification, fractional solidification and/or melt crystallization processes.

Um aspecto desta invenção relaciona-se aos processos para o dimethylsufoxide solidifying including as etapas parcialmente de solidifying uma fase líquida including o dimethylsulfoxide e o um ou mais impurezas, para dar forma a uma mistura que compreende o dimethylsulfoxide contínuo e um resíduo líquido, e separando substancialmente o dimethylsulfoxide contínuo do resíduo líquido, wherein o resíduo líquido compreende o dimethylsulfoxide líquido e ao menos uma parcela das impurezas, e wherein o resíduo líquido não é tratado subseqüentemente por nenhuma etapa do solidification parcial. Em determinadas incorporações dos processos da invenção, o purity ultra-high DMSO que excede as especificações do purity para a classe DMSO de U.S.P. pode ser produzido empregando o solidification, o solidification fracionário e/ou os processos da cristalização do derretimento.

 
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