Absorption of carbon dioxide in aqueous colloidal silica solution with NaOH

Abstract

The absorption rate (R A ) of carbon dioxide was measured into an aqueous nanometer-sized colloidal silica solution of 0-31 wt% and NaOH of 0-2 kmol/m 3 in a flat-stirred vessel for various sizes and speeds of 25 o C and 101.3 N/m 2 to obtain the volumetric liquid-side mass transfer coefficient (k L a L ) of CO 2 . The film theory accompanied by chemical reaction between CO 2 and NaOH was used to estimate the theoretical value of absorption rate of CO 2 . The empirical correlation formula containing the relationship between k L a L and rheological property of the aqueous colloidal silica solution was presented. The value of R A in the aqueous colloidal silica solution was decreased by the reduction of k L a L due to elasticity of the solution.