Nanoemulsion absorbents are studied to improve the process efficiency of rectisol, a CO2 absorption process. Dodecane droplets are dispersed in methanol at nano size and two surfactants Tween 60, Span 60 are added to maintain dispersion stability of nanoemulsion absorbents. To evaluate the dispersion stability of the prepared nanoemulsion, turbidity measurement using the Nephelometry is carried out for 7 days. As results of CO2 absorption rate experiment, the nanoemulsion absorbents with 0.05 vol% of dodecane show the best performance.