Patent ID: 7150807

Claim:
Method for evaporating at least one substance wherein a) during at least one dosing phase (TG) importing a predefined or predefinable quantity of a product (M), which comprises at least one substance that evaporates, via a feed system ( 7 , 14 , 17 , 33 , 36 ) into a revolving vessel ( 2 ), b) rotating the revolving vessel around an axis of rotation (R), and c) generating or maintaining appropriate process conditions for the evaporation of the at least one substance, whereas: the feed system ( 14 , 17 ) automatically controls or regulates a flow (F) of the product (M) during the dosing phase (TG) as a function of at least one process parameter and/or of at least one characteristic property of the product, the product (M) is imported into the revolving vessel ( 2 ) in the course of the dosing phase only during predefined feed periods interrupted by intervening intervals, the flow or imported quantity of the product is less during the intervening intervals than during the feed periods and is essentially zero during the idle intervals, and whereby a function of the formation of foam in the revolving vessel controls or regulates the flow during the dosing phase.