Patent ID: 7153396

Claim:
Device for evaporating at least one substance with a) a rotary container ( 2 ) for receiving a medium (M), that comprises the at least one substance to be evaporated, b) a drive means ( 6 ) to rotate the rotary container around an axis of rotation (R) inclined against the direction of gravity (G), c) a control mechanism ( 60 , 14 , 15 , 16 ) in an active connection with the drive means c1) to detect at least one process value and c2) to automatically control or regulate the speed of the rotary container depending on the process value/s detected, and with d) a heat transfer bath ( 3 ), into which the rotating container is or can be at least partially dipped during operation and by means of which the rotating container is or can be brought to temperatures suitable for evaporating the substance/s to be evaporated wherein e) the control mechanism controls or regulates the rotary speed of the rotary container in such a way that in the lower area of the rotary container, there is a reservoir of the medium drawn downward by gravity and out of which, at least on a portion of the inner wall of the rotary container, a film of the medium (MF) is formed that is at least approximately uniform and/or favorable for the evaporation and is constantly at least partially renewed.