Process for the reduction of acidic contaminates in...

Details Process for the reduction of acidic contaminates in... Process for the reduction of acidic contaminates in...

2008-07-29

2008-07-29

Keys, Rosalynd (Department: 1621)

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

Organic compounds

Halogen containing

C570S180000, C570S238000, C570S262000, C570S263000

Reexamination Certificate

active

10444487

ABSTRACT:
The present invention relates to processes for reducing the concentration of acidic impurities HF, HCl, HBr, HI, HNO3and H2SO4in fluorinated hydrocarbons. The process involves: (i) contacting the fluorinated hydrocarbon with a phosphorous oxyacid salt, and (ii) recovering the fluorinated hydrocarbon having reduced concentration of, or substantially free of, said acidic contaminant, provided that said fluorinated hydrocarbon is not CF3CH2CF3or CF3CHFCF3.

REFERENCES:
patent: 4102981 (1978-07-01), Woychesin et al.
patent: 5684211 (1997-11-01), Kawai et al.
patent: 6187976 (2001-02-01), Van Der Puy et al.
patent: 2001/0000911 (2001-05-01), Stewart et al.
patent: 1363543 (2002-08-01), None
patent: 1 346 936 (1974-02-01), None
patent: WO 95/26218 (1995-10-01), None
patent: WO 96/35653 (1996-11-01), None
patent: WO 98/00378 (1998-01-01), None
Lewis, Sr. Hawley's Condensed Chemical Dictionary, twelfth edition, 1993, p. 531.

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