Method for producing calcium chloride scales

Details Method for producing calcium chloride scales Method for producing calcium chloride scales

1998-02-04

1999-03-16

Nguyen, Ngoc-Yen

Chemistry: physical processes

Physical processes

Crystallization

423497, C01F 530

Patent

active

058823611

ABSTRACT:
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 CaCl.sub.2 solution (7) to the cooled surface, solidification of the layer and stripping off the solidified layer. The solution contains less than 70% CaCl.sub.2 by weight, preferably less than 65% CaCl.sub.2 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 m.sup.2 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, CaCl.sub.2.2H.sub.2 O. Dry scales thus arise.

REFERENCES:
patent: 1851309 (1932-03-01), Heath
patent: 1869906 (1932-08-01), Martin
patent: 2839360 (1958-06-01), Gump et al.
patent: 2882126 (1959-04-01), Conrad
patent: 3071816 (1963-01-01), Allen et al.

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