Rotary evaporation with variable dosage metering

Method as in one or several of the preceding claims, in which the mass flow (F) is essentially constant during at least one feed period and for the entire duration (t1, t2, t3) of the feed period.

Method as in one or several of the preceding claims, whereby during at least two of the feed periods (t1, t2, t3) the quantities of the product (M) imported in the course of the entire duration of the feed periods are mutually different.

Method as in one or several of the preceding claims, in which the time lengths of at least two feed periods are mutually different.

Method as in one or several of the preceding claims, in which the time lengths (t1, t2, t3) of the feed periods are essentially identical to one another.

Method as in one or several of the preceding claims, in which the time lengths (τ1, τ2) of the intervening intervals between the feed periods are essentially identical to each other.

Method as in one or several of the preceding claims, in which the time lengths of at least two of the intervening intervals between the feed periods are mutually different.

Method as in one or several of the preceding claims, whereby the time-related profile of the mass flow (F) of the product (M) is or can be modified during the intake phase.

Method as in one or several of the preceding claims, whereby the total quantity of the product (M) contained in the revolving vessel (2) is determined and the amount of product imported per intake phase is controlled on the basis of said determination of the total product quantity.

Method as in one or several of the preceding claims, whereby the product quantity imported into the revolving vessel during a predefined time span is determined by time summation or integration.

Method as in one or several of the preceding claims, in which the revolving vessel can be rotated around a pivot and a pivoting angle of the revolving vessel relative to a reference position is determined as a measure for the product quantity to be imported during the intake phase.

Method as in one or several of the preceding claims, whereby the mass flow during the intake phase is controlled or regulated as a function of the formation of foam in the revolving vessel.

Method as in one or several of the preceding claims, whereby the product mass flow during the intake phase is controlled or regulated as a function of the product temperature.

Method as in one or several of the preceding claims, whereby the product mass flow during the intake phase is controlled or regulated as a function of the product viscosity.

Method as in one or several of the preceding claims, whereby the product mass flow during the intake phase is controlled or regulated as a function of the speed of rotation of the revolving vessel.

Method as in one or several of the preceding claims, whereby the product mass flow during the intake phase is controlled or regulated as a function of the pressure in the revolving vessel or of the system vacuum.

Method as in one or several of the preceding claims, whereby at least one process parameter and/or at least one characteristic property of the product is automatically determined and the product mass flow during the intake phase is controlled or regulated as a function of the process parameter and/or characteristic product property thus determined.

Method as in one or several of the preceding claims, whereby the revolving vessel (2) is rotated in a heat transfer bath (Fl) and in the process is heated to a temperature that is needed to vaporize the substance(s) to be evaporated.

System as in claim 21 or claim 23, including a control device which detects at least one process parameter or characteristic property of the product (M) and controls the feed system as a function of the process parameter or characteristic product property determined.