Methods of operating a membrane separation device, control devices for a membrane separation device and devices that operate a membrane separation device

A control device for a membrane separation device operated in a continuous flow process,

• wherein a supply liquid can be separated into a first partial stream and a second partial stream, a flow rate of the second partial stream and/or a recovery rate of the second partial stream is influenced by at least one influencing variable that varies during operation, and
• to compensate for a change of the at least one influencing variable, the control device comprises a controller unit that generates a control signal that varies flow rate of the first partial stream to control a flow rate and/or a recovery rate of the second partial stream to a preset value.

A device for operating a membrane separation device in a continuous flow process, wherein, in the membrane separation device a supply liquid can be separated into a first partial stream and a second partial stream, a flow rate of the second partial stream and/or a recovery rate of the second partial stream being influenced by at least one influencing variable that varies during operation, comprising:

• a base body having at least one first channel, wherein the first partial stream can flow through the first channel, and
• a control device, wherein, to compensate for a change of the at least one influencing variable, the control device comprises a controller unit that generates a control signal that varies a flow rate of the first partial stream to control a flow rate and/or a recovery rate of the second partial stream to a preset value.