Process for the purification of fluoromethyl...

Details Process for the purification of fluoromethyl... Process for the purification of fluoromethyl...

2006-12-26

2006-12-26

Manoharan, Virginia (Department: 1764)

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

C203S059000, C203S064000, C203S067000, C203SDIG025, C568S682000, C568S683000

Reexamination Certificate

active

07153397

ABSTRACT:
A process for the purification of fluoromethyl hexafluoroisopropyl ether which comprises contacting a crude composition comprising fluoromethyl hexafluoroisopropyl ether and hexafluoroisopropyl alcohol with a modifier in the presence of which the vapor pressure of the ether and/or the alcohol is modified whereby the difference in vapor pressure of the ether and the alcohol increases relative to the difference in vapor pressure of the ether and alcohol in the absence of the modifier and separating the ether from the alcohol.

REFERENCES:
patent: 4250334 (1981-02-01), Coon et al.
patent: 4328376 (1982-05-01), Berger et al.
patent: 4469898 (1984-09-01), Coon et al.
patent: 5684210 (1997-11-01), Kawai et al.
patent: WO 99/44978 (1999-09-01), None

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