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The Influence of Distillation Conditions on the Azeotropic Composition

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Jaime Wisniak

Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel

J. Chem. Educ., 1998, 75 (11), p 1486

DOI: 10.1021/ed075p1486

Publication Date (Web): November 1, 1998

CAS

Section:

History, Education, and Documentation

Abstract

The thermodynamic conditions that determine the presence of an azeotrope in a binary solution are developed and analyzed together with the criteria that define if the azeotrope has a maximum or minimum boiling point at constant pressure. It is shown that using simple models for describing vapor-liquid equilibria and vapor pressure data of the pure components it is possible to determine rather accurately how the azeotropic point will shift if the distillation is carried out at a different pressure or temperature. Examples are given on the use of the proposed method; these can be used as classroom material.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Subject):

Thermodynamics

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Received: August 03, 2009

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