Device for continuous control of the composition of a mixture of components and system for separating constituents incorporating this analytic device

摘要

The system comprises a separation unit (2) and a feed device which contains a storage reservoir (3) receiving mixture from the separation unit, an auxiliary receiver (6) containing one of the components and a device for controlling the transfer from the receiver to the reservoir. The controller uses data from capacitance, temperature and level detectors to give the required composition. A capacitative detector (CS) is completely immersed in the fluid, a temperature detector (TS) measures the temperature of the mixture, a level detector (LS) measures the level of fluid in the storage reservoir and a control assembly (10) is connected to the various detectors to determine the volume of at least one component in the storage reservoir to establish a required composition of the mixture. The capacitative detector generates a current depending on the instant composition of the solvent mixture and its temperature, and the control assembly determines the volume of at least one component of the mixture as a function of the instant composition, the required composition, the volume of the mixture in the reservoir and the composition of at least one component. The storage reservoir contains a device for mixing (9) and a device for keeping the temperature constant. Each capacitative detector has a long central electrode surrounded by a tubular electrode and a generator of current proportional to the variation in inter-electrode capacitance. The separation unit contains a separation loop for components with a charge (F) connected to the feed device, means of injecting the charge into the loop and means for separating the fluid mixture, the components with the charge extracted. The separation unit is a simulated fluidized bed, a distillation column, and has one or more supercritical chromatography columns, one or more nanofiltration membranes or means of falling film evaporation and condensation.