Method for obtaining a purified hydrofluoroalkane, purified hydrofluoroalkane, use of same and method for analysing same
AssigneeSolvay (Societe Anonyme)
InventorsDominique Balthasart, Charles-Marie Anciaux, Yves Mahaut, Roland Klug
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Abstract
Process for the production of a hydrofluoroalkane, according to which hydrofluoroalkane comprising organic impurities is subjected to at least two distillations.
Claims24
Process for the production of purified 1,1,1,2-tetrafluoroethane, according to which 1,1,1,2-tetrafluoroethane, comprising organic impurities, is subjected to at least two distillations, the second distillation being carried out at a pressure greater than that of the first distillation, and at least one fraction composed of hydrofluoroalkane purified from organic impurities is recovered at the outlet of the second distillation.
Purified 1,1,1,2-tetrafluoroethane, exhibiting an individual content of each organic impurity of less than 10 molar ppm.
Method for the analysis of the content of organic impurities in a hydrofluoroalkane, in which
- (a) the hydrofluoroalkane is subjected to a chromatography operation and;
- (b) an operation is carried out in which the organic impurities are detected by mass spectrometry.
Process for the production of a purified hydrofluoroalkane chosen from 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,3,3-pentafluorouropane and 1,1,1,3,3-pentafluorobutane, according to which the hydrofluoroalkane, comprising organic impurities, is subjected to at least two distillations, the second distillation being carried out at a pressure greater than that of the first distillation, and at least one fraction composed of hydrofluoroalkane purified from organic impurities is recovered at the outlet of the second distillation.
Purified hydrofluoroalkane, exhibiting an individual content of each organic impurity of less than 10 molar ppm.
Dependencies are inferred from the claim text.