Process for the production of a purified hydrofluoroalkane, purified hydrofluoroalkane, use of the hydrofluoroalkane and method for the analysis of a hydrofluoroalkane
AssigneeSolvay SA
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.
Claims17
1-24. (canceled)
A 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.
A purified hydrofluoroalkane, exhibiting an individual content of each organic impurity of less than 10 molar ppm.
A process for the manufacture of a hydrofluoroalkane which comprises controlling the quality of the hydrofluoroalkane by analyzing of the content of organic impurities in a hydrofluoroalkane which comprises the steps of
- (a) subjecting the hydrofluoroalkane to a chromatography operation and
- (b) carrying out an operation in which the organic impurities are detected by mass spectrometry.
A process for the manufacture of a pharmaceutical aerosol, comprising controlling the quality of at least one hydrofluoroalkane of pharmaceutical grade, by analyzing of the content of organic impurities in a hydrofluoroalkane which comprises the steps of
- (a) subjecting the hydrofluoroalkane to a chromatography operation and
- (b) carrying out an operation in which the organic impurities are detected by mass spectrometry.
A process for the production of a purified hydrofluoroalkane selected from the group consisting of 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,3,3-pentafluoropropane 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.
Dependencies are inferred from the claim text.