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[siretb]

Hi

I have not checked the azeotropes, but would assume that in a distillation an heteroazeotrope water-DIPE would go on on top and that the alcool would stay in the bottoms. A IPA-water azeotrope is also highly likely to exist.
A residue curve , starting with your feed mixture would be of help

First identify all azeotropes and their boiling points

I would then check wheter you have a chance of handling your mixture as if it wer a binary system, made of
either (DIPE water azeotrope/ isopropanol)
of (DIPE water azeotrope/ isopropanol water azeoptrope)
and attempt graphical methods (Mc Cabe & thiele)
in any case it would give you a starting point to feed a computer program that handlesq LLE systems. You will need a computer model if you use a computer. in such case I'd advise NRTL or UNIQUAC as a second choice.

You mention extractive distillation. note that pervaporartion can be used also for such separations

Also you need to specify BOTH the purity required (ie 99.5%wt) and the fraction of initial feed you want to recover.
Hope this will help. If you need more, please supply recovery and purity specifications as well as azeotropic information.