The influence of steric hindrance in amines upon different characteristics in carbon dioxide chemical absorption, namely, absorption rate, carbon dioxide loading, and regeneration degree, has been analyzed. Aqueous solutions of monoethanolamine, 1-amino-2-propanol, and 2-amino-2-methyl-1-propanol were used to compare their behavior during carbon dioxide absorption. The presence of one or two methyl groups on the carbon next to the amino group produced changes in the analyzed parameters. In addition, the influences of the gas-flow rate and amine concentration on the chemical solvent behavior were studied to improve the mass transfer under different experimental conditions.