Energy continued product/feed ratios

It is evident that the operation in terms of product amount, reflux ratio, recovery, etc. of case 1 of Table 11.3 is very close to the operation of case 1 operation of Table 11.2. Also note that the energy consumption for CBD operation presented in Table 11.3 over a time period tp is same as that for corresponding SPSS operation over the same time period, since the vapour boilup rate in all cases used is 5 kmol/hr. Note that the results of case 2 of Table 11.3 are not close to those of case 4 of Table 11.2. The results (Table 11.2 and Table 11.3) clearly show that if the operation is restricted to one single reflux ratio or one single pass operation, it is possible to replace the CBD operation by continuous column operation using a very low feed flow rate. 

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