,000 1 2 3 4 5 6 7 8 9 10 11 12 Mo! percent wafer in azeotrope

Fig. 8-9. Effect of pressure on azeotrope composition for system, ethanol-water.

per cent alcohol and a bottoms containing 99.9 per cent alcohol. The overhead in this column will be returned to the low-pressure column for further rectification. This stream may be returned either as vapor or as liquid; however, the condensing temperature of the atmospheric column is sufficiently high that it will serve as the heat supply for the low-pressure column, and in such a case heat economy will be obtained by totally condensing the overhead and recycling the 92.5 per cent stream as a liquid. In order to simplify the calculations, it is assumed that all three feed

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