O'Reilly logo

Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

8.4 Two-Pressure Distillation Processes

Pressure affects vapor-liquid equilibrium (VLE), and in systems that form azeotropes it will affect the composition of the azeotrope. For example, Table 2-1 shows that the ethanol-water system has an azeotrope at 0.8943 mole frac ethanol at 1 atm pressure. If the pressure is reduced, the azeotropic concentration increases (Seader, 1984). At pressures below 70 mm Hg, the azeotrope disappears entirely, and the distillation can be done in a simple column. Unfortunately, use of this disappearance of the azeotrope for the separation of ethanol and water is not economical because the column requires a large number of stages and has a large diameter (Black, 1980). However, the principle of finding a pressure ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required