By Douglas C. Neckers, David H. Volman, Günther von Bünau
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In order to implement this idea, additional valves are needed, which makes the system more complex than the previous one. Its main interest is found when physical modulation is used, as in the supercritical fluid SMB for which it can be shown that a great interest could be taken from a higher pressure in zone I . The only way to obtain this results is to maintain the recycling pump immediately before zone I. A final possibility is to use the eluent pump instead of the recycling pump as explained in Fig.
Flow-diagram of the Licosep 8-200 including the solvent recycling unit. 6 Separation of Optical Isomers The interests of SMB for performing large-scale separations of optical isomers are now recognized (very short development time, extremely high probability of success, attractive purification cost). An increasing number of published results are available [50,51] among which are: prazinquatel , 0-Blockers , chiral epoxide , thiadiazin EMD5398 , hetrazepine . Very recently, the Belgian company UCB-Pharma announced their decision to purchase a large scale SMB from NOVASEP in order to perform optical isomer separation at several tons per year.
However, in several instances alternative schemes offer a better technical solution. The three-zone SMB is to be considered when the eluent consumption is not a limiting factor, while the five-zone SMB is interesting for multicomponent separation or when extreme purity of one of the two effluents is required, with a maximum unit throughput. 4 Technical Aspects A Simulated Moving Bed (whatever the number of zones) comprises a given number of columns (usually between four and 24), pumps (usually three to five) and valves allowing to connect the different flux between the columns.