It is important to remove the carbon dioxide produced by human metabolism in the limited confined space of some emergeny or work during a long time rescue,such as refuge chamber or manned spacecraft. Compared with other absorbent,the sodium lime has more stable performance,more mature technology and more reasonable price,which is the irreplaceable advantage as an absorbent used for air purification in the confined space. Due to the special conditions( such as interruption of power outside,volume restriction...