Abstract
Ebulliometry is a rapid and robust method of measuring PTx data needed to compute vapor-liquid equilibria for the accurate design of distillation columns and other chemical processing equipment. Advantages of ebulliometric PTx methods, particularly important in an industrial environment, include: data can be determined more quickly, degassing is not required, and simple apparatus and straightforward procedures are used. Specialized uses of ebulliometry include: high-pressure measurement (up to 2 MPa), measurement of infinite-dilution activity coefficients, screening of azeotropic systems, and measurement of solubility limits. Experimental measurements of infinite-dilution activity coefficients for butyraldehyde systems and high-pressure PTx data for the system dichlorosilane(1) + trichlorosilane(2) are given as examples. Two sources of systematic error in the ebulliometric PTx method are (i) superheating effects and (ii) composition corrections due to condensed-vapor holdup. Empirical tests of the magnitude of these effects and a heuristic for laboratory studies are described.
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