Chromatographic separator sorbent bed preparation

DETAILED DESCRIPTION This invention provides a sorbent bed packing procedure which minimizes sorbent bed compartment void space and provides a sorbent bed of increased density in a chromatographic separator operating on the principle of the simulated moving bed.
A resin contraction procedure is employed.
Particularly important characteristics of the disclosed process which differentiate it from other processes are: (1) No special reagents of any kind are required for resin preparation.
Accordingly, the costs, equipment and safety concerns normally associated with the requirement for special reagents are avoided.
Industrial scale simulated moving bed systems typically include several hundred cubic meters of packing material, inevitably imposing significant costs on procedures which use reagents.
(2) No handling or disposal of used reagents is required.
The procedure of this invention creates no waste materials.
(3) Bed preparation is accomplished during the normal production routine As a consequence, interruptions to production or delays during start-up (while beds are prepared) are minimized.
(4) The simulated moving bed may be repacked (for example, after some sorbent settling occurs) at any time without disturbance to the production process.
The present invention involves operating a simulated moving bed consisting of separate columns or compartments.
The compartments are filled with a separation medium (sorbent), such as ion exchange resin.
The simulated moving bed is operated such that an equilibrated separation waveform develops.
The term "equilibrated separation waveform" refers to a steady state condition in which the plot of percent solids of a component versus circulation loop position retains approximately the same shape over time, although the individual points on the plot appear to rotate around the loop over time.
The circulating waveform is monitored for the development of a resin contraction phase.
The term "resin contraction phase" refers to a fluid composition revealed by the waveform known to interact with the sorbent material to cause shrinkage of that material