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Computing the Composition of Ethanol-Water Mixtures Based on Experimental Density and Temperature Measurements
Danahy, Brooks B. ; Minnick, David L. ; Shiflett, Mark B.
Danahy, Brooks B.
Minnick, David L.
Shiflett, Mark B.
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Abstract
Two correlations were developed to calculate the composition of binary ethanol-water solutions from experimental temperature and density inputs. The first correlation is based on a Redlich-Kister (R-K) expansion and computes mixture composition within an average accuracy of ±0.45 wt.%. The R-K model is a non-linear function of composition and therefore requires the use of an iterative solving tool. A polynomial correlation was additionally developed which utilizes a direct solving method, and computes ethanol composition over a range of 0–100 wt.% [283.15–313.15 K] with an accuracy better than ±0.37 wt.%. The polynomial model is particularly advantageous as it can be tailored to specific composition ranges for increased accuracy. Both correlations are intended to provide a method for monitoring ethanol concentration within a chemical process in real time without off-line sample analysis, allowing for precise in-situ system control and optimization.
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Date
2018-08-27
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Publisher
MDPI
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Keywords
ethanol, alcohol, water, composition, density, correlation, regression, prediction
Citation
Danahy, B.B.; Minnick, D.L.; Shiflett, M.B. Computing the Composition of Ethanol-Water Mixtures Based on Experimental Density and Temperature Measurements. Fermentation 2018, 4, 72.