Block short-way evaporator with wiped-off film

A block short-way evaporator with wiped-off film, comprising a vacuum chamber containing a plurality of spaced parallel vertical double-sided flat evaporators, wipers for wiping the flat evaporating areas of the evaporators, frames which are capable of orbital motion in respective vertical planes, the wipers being supported on the frames, double-sided flat condensers in the chambers disposed in alternation with the evaporators so that they form a continuous block, on the bottom of the chamber there being distillate collecting troughs with distillate outlet tubes, the distillate collecting troughs being disposed below the double-sided flat condensers and being formed by separating partitions, residue collecting troughs alternating with the distillate collecting troughs and disposed below the double-sided flat evaporators, the residue collecting troughs being provided with residue outlet tubes, and feed tubes which are led through the bottom of the chamber and the double-sided flat evaporators into separating troughs in the upper part of the double-sided flat evaporators, the wipers being supported on the frames, the frames being rectangular in shape, the means for driving the frames in orbital motion comprising eccentric means disposed in driving engagement with the respective corners of the frame, and means for driving all of said eccentric means in synchronism.