Process for purifying perfluorinated products
AssigneeE. I. Du Pont de Nemours and Company
InventorsMark Brandon Shiflett, Akimichi Yokozeki
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Abstract
This invention relates to a process for purifying at least one of perfluoromethane and nitrogen trifluoride from a mixture thereof using an ionic liquid. The process may be performed by a technique such as extractive distillation or absorption wherein at least one ionic liquid is used as the entraining agent or absorbent, respectively.
Claims12
A process for separating either nitrogen trifluoride or tetrafluoromethane from a mixture that comprises nitrogen trifluoride and tetrafluoromethane, comprising contacting the mixture with at least one ionic liquid, which comprises an organic salt, in which one member of the group of nitrogen trifluoride and tetrafluoromethane is soluble to a different extent than the other member, and separating the lower-solubility member from the mixture;
- wherein an ionic liquid comprises a fluorinated cation and an [SbF6]−, anion.
A process for separating either nitrogen trifluoride or tetrafluoromethane from a mixture that comprises nitrogen trifluoride, tetrafluoromethane and one or more other compounds as components of the mixture, comprising contacting the mixture with at least one ionic liquid in which one member of the group of nitrogen trifluoride and tetrafluoromethane is soluble to a different extent than either the other member of the group or another component of the mixture, and separating the low solubility member of the group from the mixture;
- wherein an ionic liquid comprises a fluorinated cation and an [SbF6]− anion.
Dependencies are inferred from the claim text.