Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms
AssigneeSolvay SA
InventorsRalf Herkelmann, Carsten Brosch, Vincent Wilmet
Life of this patent
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Abstract
Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms, by extraction using an organic solvent.
Claims24
A process for the separation of hydrogen fluoride from a mixture comprising 1,1,1,3,3-pentafluorobutane and HF,
- wherein the process comprises
- extracting said mixture with at least one organic solvent, under conditions of pressure which is sufficient to maintain the mixture in a liquid state,
- wherein said pressure is the autogenous pressure of the mixture or a pressure less than 10 bars,
- to provide an organic phase enriched in 1,1,1,3,3-pentafluorobutane and a second phase enriched in hydrogen fluoride;
- and
- separating said organic phase enriched in 1,1,1,3,3-pentafluorobutane from said second phase enriched in hydrogen fluoride.
A process for the separation of hydrogen fluoride from a mixture comprising HF and at least one hydrofluoroalkane selected from the group consisting of 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,1,2,2,3-pentafluoropropane (HFC-245ca), 1,1,1,2,3-pentafluoropropane (HFC-245eb), 1,1,1,3,3,3-hexafluoropropane (HFC-236fa), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea) and 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea),
- wherein the process comprises
- extracting said mixture with at least one organic solvent, under conditions of pressure which is sufficient to maintain the mixture in a liquid sate,
- wherein said pressure is the autogenous pressure of the mixture or a pressure less than 10 bars,
- to provide an organic phase enriched in said at least one hydrofluoroalkane and a second phase enriched in hydrogen fluoride
- said at least one hydrofluoroalkane being selected from the group consisting of 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,1,2,2,3-pentafluoropropane (HFC-245ca), 1,1,1,2,3-pentafluoropropane (HFC-245eb), 1,1,1,3,3,3-hexafluoropropane (HFC-236fa), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea) and 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea);
- and
- separating said organic phase enriched in said at least one hydrofluoroalkane from said second phase enriched in hydrogen fluoride.
Dependencies are inferred from the claim text.