ABSTRACT

The diffusion coefficients of alkanolamines in water at infinite dilution and the mutual diffusion coefficients of aqueous diglycolamine, triethanolamine, 2-amino-2-methyl-l-propanol, and 2-piperidineethanol solutions have been studied by using the Taylor dispersion method. Experimental results for temperatures from (30 to 70) C and at atmospheric pressure as functions of the concentration of alkanolamines from {0.5 to 3 (or 4)} kmol.m-3 are reported. The uncertainty of the measurement is estimated to be 2.0%. The diffusion coefficients of alkanolamines in water at infinite dilution were found to vary systematically with the molar mass of the alkanolamines. The obtained mutual diffusion coefficients were correlated by using both a simple relation and the UNIDIF equation. The measured mutual diffusivity data are also well represented by a free-volume expression. The results of this study can be used to develop the kinetic model for gas absorption using aqueous alkanolamine solutions as absorbents.

Compounds

#	Formula	Name
1	C7H15NO	2-(2-hydroxyethyl)piperidine
2	C6H15NO3	triethanolamine
3	C4H11NO	2-amino-2-methylpropan-1-ol
4	C4H11NO2	2-(2-aminoethoxy)ethanol
5	CH4O	methanol
6	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	5 6	Binary diffusion coefficient, m2/s ; Liquid	Mole fraction - 5; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	7
POMD	4 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 4; Liquid	Liquid	Taylor dispersion method	5
POMD	4 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid	Pressure, kPa; Liquid	Liquid	Taylor dispersion method	25
POMD	2 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Taylor dispersion method	5
POMD	2 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 2; Liquid	Pressure, kPa; Liquid	Liquid	Taylor dispersion method	20
POMD	3 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 3; Liquid	Liquid	Taylor dispersion method	5
POMD	3 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 3; Liquid	Pressure, kPa; Liquid	Liquid	Taylor dispersion method	25
POMD	1 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Taylor dispersion method	5
POMD	1 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid	Pressure, kPa; Liquid	Liquid	Taylor dispersion method	20

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Mutual Diffusion Coefficients of Some Aqueous Alkanolamines Solutions

Chang, L.-C.[Li-Chung], Lin, T.-I.[Tong-I], Li, M. -H.[Meng-Hui]

ABSTRACT