INDUSTRIALAND ENGINEERING CHEMISTRY 485 amounted to 100 ml., and the water layer (which could be redistilled), to 110 ml. Proper design of the distilling head permits the direct return of the water layer to the column so that water-saturated butanol alone is the offtake. If anhydrous butanol is desired, the butanol layer may be distilled, and since the composition is in the Y to 100 region of Figure 2, the azeotrope is collected in the distillate and anhydrous butanol is left behind. DiscussionThe method of recovery selected for industrial use would undoubtedly be determined by the cost of equipment, the cost of heat, and rapidity. Each of the processes described has advantages peculiar to itself. Both methods permit quantitative recovery of butanol with no interference from lignin or alkali. Neither method eliminates consideration of other

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