METHOD OF SEPARATING/RECOVERING CARBON DIOXIDE

摘要

Carbon dioxide absorbed can be efficiently released in a shorter period and the carbon dioxide can be recovered after having been converted to carbon monoxide, which is usable in a wider range of applications. A carbon dioxide absorber is caused to absorb carbon dioxide. Thereafter, the carbon dioxide absorber having carbon dioxide absorbed therein is heated while feeding hydrogen gas or a hydrocarbon gas thereto to release the carbon dioxide. In the release step, the absorber may be heated at a temperature of 800-1,000°C. The carbon dioxide absorber may be one comprising an oxide of an alkali earth metal as the main component or one comprising, as the main component, a composite oxide including an alkaline earth metal oxide. The carbon dioxide absorber may be one comprising a composite oxide selected among Ba₂TiO₄, Sr₂TiO₄, and Ba₃Ca₂Ti₂O₉ as the main component.