Method for recovering fluorine-containing emulsifier

Details Method for recovering fluorine-containing emulsifier Method for recovering fluorine-containing emulsifier

2008-04-01

2008-04-01

Hopkins, Robert A. (Department: 1724)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C210S808000

Reexamination Certificate

active

07351342

ABSTRACT:
An aqueous solution containing a fluorine-containing emulsifier in a low concentration of at least 1 ppm by mass and at most 1% by mass (e.g., coagulation waste water after an emulsion polymerization of a fluoropolymer and/or an aqueous solution obtained by washing with an aqueous solution a waste gas from a drying process and/or a heat treating process of the fluoropolymer) is subjected to vacuum concentration under a pressure of at most 100 kPa and a temperature of the aqueous solution of at most 100° C. by means of a heating tube surface evaporation type concentrator equipped with a heat pump or the like, and the fluorine-containing emulsifier is recovered from a highly concentrated aqueous solution containing the fluorine-containing emulsifier in a higher concentration of at least 5% by mass. According to the present method, the fluorine-containing emulsifier can be recovered with a high yield from a low-concentration liquid such as coagulation waste water of a fluoropolymer.

REFERENCES:
patent: 4369266 (1983-01-01), Kuhls et al.
patent: 4952290 (1990-08-01), Carnarius et al.
patent: 5312935 (1994-05-01), Mayer et al.
patent: 6518442 (2003-02-01), Felix et al.
patent: 2003/0098282 (2003-05-01), Funaki et al.
patent: 2003/0125421 (2003-07-01), Bladel et al.
patent: 2004/0072977 (2004-04-01), Kaulbach et al.
patent: 0 716 867 (1996-06-01), None
patent: 7-8704 (1995-01-01), None
patent: 10-57702 (1998-03-01), None
patent: 2003-160531 (2003-06-01), None
patent: WO 02/13953 (2002-02-01), None

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