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

Abstract Due to application of dibutylamine as absorbent for CO2, densities (ρ), speed of sound (u) and viscosities (η) 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,VmE, deviation in speed of sound, Δu, excess isentropic compressibility, κSE, deviation in viscosities, Δη. These calculated properties were correlated by Redlich-Kister polynomial equation. Negative sign of VmEand κSE indicated the formation of strong associative interactions between unlike components, DBA and isomeric butanols. Negative values of Δη also is in support with the analysis made on the basis of VmEand κSE. VmEand κSEdata 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 data were examined in terms of free length theory and various related correlations like Nomoto, van Dael, Impedance and collision factor theory (CFT). Δη values were analyzed in terms of Bloomfield and Devan's (BFD) model and theoretical results assisted the experimental results.