Cyclic batch processes examples

An efficient a-sialylation that took advantage of the highly reactive sialyl donors having C5 cyclic imides, especially phthalimide (NPhth), by virtue of the fixed-dipole moment effects, was also reported [42], For example, the use of the sialyl donor 4 and acceptor 6 at -78°C supplied the sialoside 7 as a only with 92% yield on 50 mg scale. The scale-up in batch process, however, significantly decreased the yield and stereoselectivity. This decrease in sialylation efficiency might be a result of... 

The simulation reported here consists of the following sequential operating procedure applied to an initially evacuated adsorber (I) charge up to P = 10 bar, (II) constant-pressure feed, and (III) discharge down to F = 1.25 bar. This example encompasses the major steps of every cyclic batch adsorption process for gas separation, in which regeneration of the bed is accomplished by reducing the pressure at essentially constant temperature, as is the case in pressure swing adsorption. The input parameters and output variables for each phase are listed in Table 1. 

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