Patent ID: 6063285
Filing Date: 2000-05-16
Classification: B01D,C07C

Abstract:
A process for regulating flow rates in a simulated moving bed separation unit comprising a plurality of beds disposed in a closed loop in at least one chromatographic column (1) and comprising at least one means for recirculating fluid (9) and comprising at least two lines for injecting fluid at a controlled flow rate and at least two lines for withdrawing fluid, one of said withdrawal (extract or raffinate) lines being under flow rate control, the other (60) being under pressure control via at least one control valve (6), said process comprising establishing a suitable pressure drop by providing at least one restriction means (201) in a line (60) for withdrawing fluid from the column or columns between at least one of the beds and a pressure control valve (6) located in said withdrawal line (extract or raffinate) so as to obtain a pressure upstream of said valve within a range of values in the range from the lowest withdrawal pressure PO and said value PO increased by a fraction of the pressure drop in the column.