Internal tubular falling film apparatus for the evaporation of liquids and for the absortion or degassing of solutions of two or more substances

Apparatus for the evaporation of liquids or for the absorption or degassing of solutions of two or more substances, having a completely closed upright pressure tank provided with at least one inlet and one outlet, through which tank a thermal transfer fluid can flow, the interior of the tank containing a plurality of vertical tubes parallel to and spaced from one another whose ends are brought sealingly through horizontal plates closing off the pressure tank at the bottom and at the top such that they open into a bell disposed in a pressure-tight manner on the bottom and top of the pressure tank, the upper ends of the tubes protruding into the bell each by the same amount above the upper side of the top horizontal plate and an inlet for liquid or solution being provided on the upper bell plus a connection for the infeed and outfeed of evaporated liquid or gaseous solution component, and an outlet for liquid or liquid solution being provided on the bottom bell, while at a distance above the upper mouths of the tubes and below the liquid or solution inlet a dividing plate parallel to the top plate of the pressure tank is inserted into the upper bell and contains a plurality of perforations of small diameter offset from the mouths of the tubes, characterized in that, at a distance above the perforated dividing plate (42;

• 142) and above the inlet (36;
• 136) for the liquid or solution, and below the connection (38;
• 138) for feeding in or carrying away evaporated liquid or gaseous solution component, an additional dividing plate (52;
• 152) is inserted into the bell (24;
• 124), and that the space formed between the perforated dividing plate and the additional dividing plate contains a number of vertical tubes (54;
• 154) aligned with the tubes passing through the pressure tank, whose ends are brought sealingly through the lower perforated dividing plate and the additional upper dividing plate.