Carbon dioxide was absorbed into an aqueous nanometer-sized colloidal silica solution in a flat-stirred vessel at 25 o C and 101.3 kPa to measure the absorption rate of CO 2 . The concentrations of silica were in the range of 0-31 wt% and the sizes were 7, 60, and 111 nm. The solution contained monoethanolamine (MEA) of 0-2.0 kmol/ m 3 . The volumetric liquid-side mass transfer coefficient (k L a) of CO 2 was correlated with the empirical formula representing the rheological property of silica solution. The use of the aqueous colloidal silica solution resulted in a reduction of the absorption rate of CO 2 compared with Newtonian liquid based on the same viscosity of the solution. The chemical absorption rate of CO 2 was estimated by film theory using k L a and physicochemical properties of CO 2 and MEA.
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