Rotary evaporation with variable dosage metering

Abstract

Method and system for evaporating at least one substance. During at least one dosing phase (TG) a predefined or predefinable quantity of a product (M) which contains at least one substance to be evaporated is imported via a feed system (7, 14, 17, 33, 36) into a revolving vessel (2). The revolving vessel is rotated around an axis of rotation (R) and appropriate process conditions for the evaporation of at least one substance are generated or maintained. The flow (F) of the product (M) is automatically controlled or regulated by the feed system (14, 17) during the dosing phase (TG) in particular 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 (t1, t2) that are interrupted by intervening intervals and especially idle intervals (t1, t2). The flow or imported quantity of the product is less during the intervening intervals by at least a factor of 10 and preferably at least by a factor of 20 than during the feed periods and is essentially zero during the idle intervals. The time duration of the feed periods and/or of the intervening intervals is or can be modified during the dosing phase.

Dependencies are inferred from the claim text.