Purification of 1,1,1,3,3,3-hexafluoroisopropanol

Details Purification of 1,1,1,3,3,3-hexafluoroisopropanol Purification of 1,1,1,3,3,3-hexafluoroisopropanol

C - Chemistry, Metallurgy

07

C

C07C 31/34 (2006.01)

Patent

CA 2555653

1,1,1,3,3,3-Hexafluoroisopropanol (HFIP) substantially free of 1,1,1- trifluoroacetone (TFA) can be separated from a mixture containing both compounds by A) catalytic reduction with hydrogen followed by fractional distillation; B) cooling to a temperature at which HFIP freezes and TFA remains liquid; C) forming a high boiling complex comprising HF and TFA followed by fractional distillation; or D) producing HF-free conditions to yield a HFIP/TFA azeotrope followed by fractional distillation. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR § 1.72(b).

Le 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) sensiblement exempt de 1,1,1-trifluoroacétone (TFA) peut être séparé d'un mélange contenant les deux composés par A) une réduction catalytique avec un hydrogène suivie d'une distillation par fraction; B) refroidissement à une température à laquelle HFIP se congèle et TFA reste liquide; C) la formation d'un complexe à forte ébullition comprenant HF et TFA suivie d'une distillation par fraction; ou D) la production de conditions exemptes de HF pour obtenir un azéotrope HFIP/TFA suivie d'une distillation par fraction. Cette invention s'accorde avec les règles d'un abrégé qui permettent au chercheur ou à un autre lecteur d'évaluer rapidement le sujet traité. Cet abrégé ne va pas servir à interpréter ou restreindre la portée ou la signification des revendications.

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