Method for producing calcium chloride scales and a use of...

C - Chemistry – Metallurgy – 01 – F

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C01F 11/30 (2006.01) B01J 2/22 (2006.01) B01J 2/24 (2006.01) C01F 11/24 (2006.01)

Patent

CA 2228586

In the method, calcium chloride scales (75) are produced on a cooled surface (20), namely through the application of a layer (70) consisting of an aqueous CaCl2 solution (7) to the cooled surface, solidification of the layer and stripping off the solidified layer. The solution contains less than 70 % CaCl2 by weight, preferably less than 65 % CaCl2 by weight. The layer thickness is set to a maximum of about 1 mm. A relative speed between the point of application of the solution and the cooling surface is produced so that a specific production rate of at least 20 g/s m2 is connected with this relative speed. The heat is carried off so rapidly through the cooling surface that the solidified layer remains largely free from calcium chloride dihydrate, CaCl2~2H2O. Dry scales thus arise.

Cette méthode permet de produire des dépôts de chlorure de calcium (75) sur une surface refroidie (20), par l'application d'une couche (70) constituée d'une solution aqueuse de CaCl2 (7) sur la surface refroidie, la solidification de la couche et l'enlèvement de la couche solidifiée. Cette solution contient moins de 70 % de CaCl2 en masse ou de préférence, moins de 65 % de CaCl2 en masse. L'épaisseur de la couche est fixée à un maximum d'environ 1 mm. Il se crée une vitesse relative entre le point d'application de la solution et la surface de refroidissement de façon à associer à cette vitesse relative un taux de production d'au moins 20 g/s m2. La chaleur se dégage si rapidement à travers la surface de refroidissement que la couche solidifiée reste en grande partie exempte de chlorure de calcium dihydraté, CaCl2.2H2O. On obtient donc des dépôts secs.

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