Problem 2 - Minimisation of Off-cuts

For a linear reflux ratio policy in each of the cuts, the problem OP2 can be written as  

Farhat et al. (1990) used augmented Lagrangian method to solve the optimisation problem presented above. See the original reference for further details. 

Purity of Bottom Product, XSPEC3 ( x 4), molefraction = 0.95 Total Batch Time, hr (fixed) = 2.5 

Amount of Cuts (mol) Collected Using Constant R Linear R 

Doherty, M.F. and Malone, M.F., Design and operating policies for multicomponent batch distillation. AIChE Annual Meeting, Los Angeles, USA (1991). 

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