Mixtures of dimethylether and of 1,1,1,2-tetrafluoroethane,...

C - Chemistry – Metallurgy – 09 – K

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31/61, 18/679

C09K 5/04 (2006.01) C07C 19/08 (2006.01) C07C 43/04 (2006.01) C08J 9/14 (2006.01) C09K 3/30 (2006.01)

Patent

CA 2036570

Pour remplacer les chlorofluorocarbures comme fluides frigorigènes, l'invention propose d'utiliser un mélange contenant environ de 15 à 95% en masse de diméthyléther et environ de 35% à 65% en masse de 1,1,1,2-tétrafluoroéthane. Ces composés forment un azéotrope qui, à son point d'ébullition normale (environ -22,4°C sous 1,013 bar), contient environ 62,3% en masse de 1,1,1,2-tétra- fluoroétane. Le mélange selon l'invention peut également être utilisé comme propulseur d'aérosols ou comme agent d'expansion des mousses plastiques.

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