Separation Duties in Continuous Columns

Optimal design and operation of CBD column for single and multiple separation duties have been presented in detail by Mujtaba and Macchietto (1996) and in Chapter 7. 

Reprinted with permission from IChemE, UK. Full reference is at the end of the chapter. 

Christensen and Jorgensen (1987) proposed a measure, q, for the degree of difficulty of separation for batch distillation (as presented in Chapter 3). Mujtaba (1997) used the ratio of minimum number of trays required to achieve a separation task to the actual number of trays available for the task to calculate, qc, for 

A very similar measure of the degree of difficulty of separation proposed by Kerkhof and Vissers (1978) could also be used to compare the performances by the two columns. 

Mujtaba (1997) used the minimum time to evaluate the performance of continuous column operation under multiple separation duties. However, time does not explicitly appear in continuous column model equations but the feed rate is a measure of the batch time (t = BJF). Note, maximisation of the feed rate will therefore ensure minimisation of the batch time. 

---