Ternary mixtures energy demand

Unlike the past work, this work focuses on optimal design and operation of multivessel batch distillation column with fixed product demand and strict product specifications. Both the vapour load and number of stages in each column section are optimised to maximise a profit function. For a ternary mixture, the performance of the multivessel column is also evaluated against that of a conventional batch distillation column. Although the profitability and the annual capitalised cost (investment) of the multivessel column is within 2-3% compared to those of conventional column, the operating cost (an indirect measure of the energy cost and environmental impact) is more than 30% lower for multivessel column. Thus, for a given separation task, multivessel column is more environment friendly. 

Fig. 5.2-28 Minimum energy demand of preferred separation of an ideal ternary mixture...

Fig. 11.2-2 Flow sheet and energy demand of the c-path for fractionating a zeotropic ternary mixture...

The process structiue and energy demand of the thermally coupled c-path are illustrated in Fig. 11.2-16. Here, the colurrm C-1 is operated at a higher pressitre and the waste heat of this colurrm is supplied to the reboiler of colitrrm C-2. As can be seen from the parameter lines in the triangrrlar diagram, the fractiorration of the ternary mixture (characterized by norrlinear parameter Mnes, see Chap. 5) in colimm C-1 is decisive for the energy demand of the integrated process at low values of (see Fig. 5.2-32). 

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