Membrane-assisted vapor stripping

Vane, L.M. and Alvarez, F.R. (2008) Membrane-assisted vapor stripping energy-efficient hybrid distillation vapor permeation processes for alcohol-water separation. Journal of Chemical Technology and Biotechnology, 83(9), 1275-1287. 

Figure 2.10 Schematic of hybrid vapor stripping-membrane vapor permeation process ("membrane-assisted vapor stripping") process for recovering and drying aicohois from water. Feed/ effluent heat recovery exchanger on stripping coiumn not shown.

Figure 2.11 Comparison of the primary energy usage for ethanol/water separation using traditionai distillation/adsorption process (Fig. 2.9) and hybrid membrane-assisted vapor stripping (MAVS Fig. 2.10) process. Minimum energy (from minimum work calculation) shown as reference. Assumptions 37% and 85% efficient conversion of primary energy to electrical energy and thermal energy, respectively, 0.02 wt% ethanol in stripping column bottoms, and 99.5 wt% ethanol product (0.5 wt% water).

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