Abstract
Absorption rate of carbon dioxide was measured in the aqueous xanthan gum (XG) solution in the range of 0–0.15 wt.% containing NaOH of 0–2 kmol/m 3 in a flat-stirred vessel with an impeller of 0.05 m and agitation speed of 50 rpm at 25 °C and 0.101 MPa. The volumetric liquid-side mass transfer coefficient ( k L a) of CO 2, which was correlated with the viscosity and the elastic behavior of XG solution containing Deborah number as an empirical formula, was used to estimate the chemical absorption rate of CO 2 ( R A). R A, which was estimated by mass transfer mechanism based on the film theory using the physicochemical properties and the kinetics of reaction between CO 2 and NaOH, was compared with the measured rate. The aqueous XG solution with elastic property of non-Newtonian liquid made R A increased compared with Newtonian liquid based on the same viscosity of the solution.
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