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

2005-02-04

2010-02-09

Price, Elvis O (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S913000, C568S914000

Reexamination Certificate

active

07659433

ABSTRACT:
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).

REFERENCES:
patent: 3702872 (1972-11-01), Regan
patent: 974 612 (1964-11-01), None
Derwent Publications Ltd. 1994-252744; XP-002463629; Central Glass Co. Ltd. Jul. 5, 1994, Abstract.

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