Process and apparatus for the concentration of an alkaline solut

Details Process and apparatus for the concentration of an alkaline solut Process and apparatus for the concentration of an alkaline solut

1981-06-26

1982-11-02

Sever, Frank

Concentrating evaporators

Film type

Moving film

159 49, B01D 110, B01D 122

Patent

active

043572065

ABSTRACT:
An alkaline solution film flowing from the top toward the bottom in falling-film evaporator tubes (1) is heated by a heat-transfer fluid flowing from the bottom toward the top in a narrow heating jacket (5). Since large temperature differences occur between the heat-transfer fluid and the alkaline solution film in the upper heated portion of the evaporator tube (1), in contrast to the lower portion, especially at high flow rate as it occurs in a narrow heating jacket (5), the heat flow density can at that location lead to a lack of wetting of the evaporator tube. To avoid such critical heat flow densities, the upper section (5a) of the heating jacket (5) is conically widened and thus the flow rate in this section is reduced to such an extent that a critical heat flow density is not reached at that point.

REFERENCES:
patent: 2545028 (1951-03-01), Haldeman

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