Carbon dioxide was absorbed into water-in-oil (w/o) emulsion composed of aqueous diethanolamine (DEA) droplets as a dispersed phase and benzene solutions of polybutene (PB) and polyisobutylene (PIB) as a continuous phase in a flat-stirred vessel to investigate the effect of non-Newtonian rheological behavior on the rate of chemical absorption of CO2, where the reaction between CO2 and DEA in the aqueous phase was assumed to be a pseudo-first-order reaction. The liquid-side-mass-transfer coefficient, k(L), which was obtained from the dimensionless empirical equation containing the properties of pseudoplasticity of the non-Newtonian liquid, was used to estimate the enhancement factor due to chemical reaction. It was expressed that PIB with elastic property accelerated the rate of chemical absorption Of CO2 by the comparison of k(L) in the non-Newtonian liquid with that in the Newtonian liquid.