Volumetric, acoustic, transport and FTIR studies of binary di-butylamine plus isomeric butanol mixtures as potential CO2 absorbents

Due to application of dibutylamine as absorbent for CO2, densities (rho), speed of sound (u) and viscosities (eta) of binary liquid mixtures containing di-butylamine (DBA) + 1-butanol or + 2-butanol or + 2-methylpropan-1-ol or + 2-methylpropan-2-ol were determined in the temperature range 298.15 to 308.15 K as a function of mole fraction of DBA. Experimental data were used to calculate excess molar volume,V-m(E), deviation in speed of sound, Delta u, excess isentropic compressibility, kappa(E)(S), deviation in viscosities, Delta eta. These calculated properties were correlated by Redlich-Kister polynomial equation. Negative sign of V-m(E) and kappa(E)(S) indicated the formation of strong associative interactions between unlike components, DBA and isomeric butanols. Negative values of Delta eta also is in support with the analysis made on the basis of V-m(E) and kappa(E)(S). V-m(E) and kappa(E)(S) data were analyzed theoretically in terms of PFP and Graph theoretical approach. Both theories predict sign as well as magnitude and both the theoretical results well supported the experimental data. The speeds of sound datawere examined in terms of free length theory and various related correlations like Nomoto, van Dael, Impedance and collision factor theory (CFT). Delta eta valueswere analyzed in terms of Bloomfield and Devan's (BFD) model and theoretical results assisted the experimental results. (C) 2020 Elsevier B.V. All rights reserved.