Carbon dioxide removal from power station flue gas was tested in a pilot-scale absorber of about 25 m in height, operated at a volumetric gas flow rate from rated 555 m(3)/h to 1100 m(3)/h. The test results revealed that a chemical absorption process using KS-1 solution, which is a hindered type alkanolamine, and an absorber equipped with regular packings could recover double the amount of carbon dioxide as compared to the conventional design. Accordingly, the construction cost of the absorber will be drastically reduced, because the same volumetric flow rate of flue gas can be treated by an absorber with half of the conventional cross-sectional area.