Density, Viscosity, Solubility, and Diffusivity of N₂O in Aqueous Amino Acid Salt Solutions

Abstract

Solubility and diffusivity of N 2 O in aqueous solutions of potassium taurate are reported over a wide range of concentration and temperature. Also, the solubility of N 2 O in aqueous potassium glycinate solution is reported at 295 K. The ion specific constants, based on the model of Schumpe, 5,6 are reported for taurate and glycinate anions. A modified Stokes-Einstein relationship is proposed for the diffusivity of N 2 O in aqueous potassium taurate solution in the temperature range 293-308 K.

Characterization of potassium glycinate for carbon dioxide absorption purposes

“…The average h Gly − over the temperature range is 0.0397. Taking the values of solubility in water reported by Versteeg and Van Swaaij (1988), the anion parameter h Gly − obtained by Kumar et al (2001) is 0.0413 at 295 K which is in agreement with the present work. The value of the anion specific parameter h Gly − along with the CO 2 specific parameter, h CO 2 , determined by Weisenberger and Schumpe (1996) enables to predict Sechenov's constant of CO 2 in potassium glycinate solutions, K CO 2 , presented in Table 4.…”

“…Many authors studied the dependence of the diffusion coefficient on the temperature and on the concentration of the absorbent solution and concluded that it can be related to the solution viscosity, , through a modified Stokes-Einstein equation (Brilman et al, 2001;Joosten and Danckwerts, 1972;Kumar et al, 2001;Versteeg and Van Swaaij, 1988).…”

“…TNO Environment Energy and Process Innovation has been developing a process for carbon dioxide removal from flue gas process based on the use of amino acids and salts (Feron and Jansen, 2002). Kumar and co-workers studied in detail the absorption of carbon dioxide in potassium salts of taurine and briefly analyzed glycine (Kumar et al, 2001(Kumar et al, , 2002(Kumar et al, , 2003a. Holst et al (2006) compared the apparent absorption rate constants of CO 2 with different amino acid salt solutions and concluded that they were comparable with alkanolamines.…”

Equilibrium Solubility of CO2 in Aqueous Potassium Taurate Solutions: Part 2. Experimental VLE Data and Model

“…The numerical values of the temperature-independent ion-specific constants were obtained from the work of Kumar et al, 12 and the value of temperature-dependent gas (CO 2 ) specific constant was obtained from the work of Weisenberger and Schumpe. 11 For water, the vapor-liquid equilibrium is given by…”

Measurement and prediction of densities, viscosities, and surface tensions for aqueous solutions of potassium citrate

“…The density, viscosity and surface tension of aqueous amino acid salts can also be obtained from the literature [12][13][14] Then the solution was transferred into a 50 mL standard flask and deionized water was added into the flask to the mark. The potassium citrate solution was prepared in a 50 mL standard flask to a given concentration.…”