Analysis of the Composition of Water–Alcohol Mixtures Using the Infrared Absorption Spectra of their Vapor

Author(s):  
V. L. Vesnin
2021 ◽  
Vol 88 (6) ◽  
pp. 933-941
Author(s):  
V. L. Vesnin

The article presents the results of studies of infrared absorption spectra of saturated vapors of alcohols and alcohol-containing mixtures in the range of 1.3—1.5 μm. A method was developed for the quantitative determination of the composition of water-alcohol mixtures based on the use of multiple linear regression, and a range of methanol concentrations was determined, in which the nonlinearity of the dependence of the concentration of alcohols in saturated vapors over a liquid mixture on the concentration of alcohols in this liquid mixture does not significantly affect the results of analysis of the mixture composition. A method for optimizing a set of wavelengths for multiple linear regression, based on minimizing the mean-square error in determining the concentration is proposed and implemented. The developed methods make it possible to determine the presence of small (<1%) amounts of methanol against the background of large amounts of ethanol and water using relatively inexpensive and accessible spectroscopic equipment.


1986 ◽  
Vol 21 (1) ◽  
pp. K10-K12 ◽  
Author(s):  
A. A. Alybakov ◽  
R. T. Aitmatova ◽  
Sh. Akchalov ◽  
N. Toichiev

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