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

1981-07-06

1983-05-17

Sever, Frank

Concentrating evaporators

Film type

Moving film

203 89, B01D 122

Patent

active

043838871

ABSTRACT:
A method and apparatus for the concentration of an alkaline solution to an approximately anhydrous melt using the falling-film principle under atmospheric pressure wherein the solution to be concentrated is conducted along the internal surface of evaporator tubes (1). Each tube (1) is surrounded by a heating jacket (2). The heating jackets (2) are fed with heat-transfer fluid from a conduit (6) which is common to all jackets. An annular collecting trough (8) is associated with the lower end of each evaporator tube (1). The metal running off from the tube (1) is collected by the trough (8) separately from the vapors. All of the troughs (8) are connected to a melt discharge line (9) which is also common to all troughs. The vapors descending in the tube (1), in contrast thereto, pass through the opening (8a) of the collecting troughs (8) into a collecting duct (10) which is common to all troughs. By the separation of the melt and vapors at the tube end portions, a renewed drop in the alkali concentration is avoided.

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