Process and device for improving the purity of a product in a simulated moving bed

摘要

A volume of fluid is constantly circulated in a bypass line connecting the chambers in one tray to those in another during a cycle period. During this time, the chambers receive neither the load nor the desorbent. The flow rate is adjusted to balance the chambers with a fluid of the same composition as that circulating between the trays The chambers are separated by one or two adsorbent bed(s). The flow in the bypass is the quotient of the volume in the chambers and the bypass line, divided by the cycle time, plus or minus 50%, plus or minus 15%. The bypass flow is stopped for a period to allow the load or desorbent to be injected into the chambers, or the extraction of material (flush-out). An Independent claim is included for the apparatus for the above process.