Compositions – Vaporization – or expansion – refrigeration or heat or energy...
Reexamination Certificate
1999-01-12
2001-02-13
Einsmann, Margaret (Department: 1751)
Compositions
Vaporization, or expansion, refrigeration or heat or energy...
C062S114000
Reexamination Certificate
active
06187219
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerant. Hydrochlorofluorocarbons, hydrofluorocarbons, azeotropic compositions thereof and like compositions are known as working fluids or refrigerants. Among them, R-11 (trichlorofluoromethane), R-12 (dichlorodifluoromethane), R-22 (chlorodifluoromethane), etc. have been conventionally used as working fluids for refrigerators. In recent years, however, it has been suggested that some hydrogen-free chlorofluorocarbons, when released into the atmosphere, would deplete the stratospheric ozone layer, thereby inflicting a serious adverse influence on the ecosystem including humans on the earth. In view of the problem, a worldwide agreement calls for the restriction of use and production of major ozone-depleting chlorofluorocarbons. Among the chlorofluorocarbons to be controlled for the restriction are R-11, R-12 and the like all of which are widely used as mentioned above. With the spread of refrigerators and air-conditioning systems, the use and production of these refrigerants are enjoying an annually increasing demand. However, the control over these refrigerants will greatly affect our residential environments and the current social framework as a whole. Consequently, there is an urgent demand for development of a novel refrigerant which has no or little potential to cause the problem of depleting the stratospheric ozone layer.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a novel refrigerant which has excellent properties for use in refrigerators, and which would exert little or no influence on the stratospheric ozone layer, when released into the atmosphere. During the research, we found that when using a mixture of three compounds selected from the group consisting of specific hydrofluorocarbons (hereinafter simply referred to as “HFC”), the contemplated object can be achieved.
According to the present invention, there is provided a refrigerant comprising a mixture of three compounds selected from the group consisting of hydrofluorocarbons represented by the formula
C
l
H
m
F
n
(1)
wherein when l is 1, m is an integer of 1 or 2, n is an integer of 2 or 3 and m+n=4; when l is 2, m is an integer of 1 to 4, n is an integer of 2 to 5 and m+m=6; and when l is 3, m is an integer of 1 to 3, n is an integer of 5 to 7 and m+n=8.
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patent: 5185094 (1993-02-01), Shiflett
patent: 5370811 (1994-12-01), Yoshida et al.
patent: 5438849 (1995-08-01), Yoshida et al.
patent: 5643492 (1997-07-01), Shiflett
patent: 5709092 (1998-01-01), Shiflett
patent: 5722256 (1998-03-01), Shiflett
Fujiwara Katsuki
Noguchi Masahiro
Omure Yukio
Daikin Industries Ltd.
Einsmann Margaret
Larson & Taylor PLC
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