| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and a system for circularly using carbon dioxide, in each of which almost all of foreign matter contained in treating carbon dioxide are absorbed in a liquid absorbent and separated surely from the foreign matter-absorbed treating carbon dioxide and the foreign matter-removed treating carbon dioxide is reused to enhance the purification efficiency of the treating carbon dioxide. <P>SOLUTION: The method for circularly using carbon dioxide comprises; a treatment step of bringing the treating carbon dioxide into contact with the object to be treated to absorb the foreign matter contained in the object to be treated in the treating carbon dioxide; a purification step of bringing the foreign matter-containing treating carbon dioxide of a gaseous or supercritical state into contact with the liquid absorbent to absorb the foreign matter contained in the treating carbon dioxide of the gaseous or supercritical state in the liquid absorbent together with a part of the treating carbon dioxide and purify the treating carbon dioxide 11 of the gaseous or supercritical state and returning the purified treating carbon dioxide 11 to the treatment step; and a separation step of separating the liquid absorbent, which contains the foreign matter and a part of the treating carbon dioxide, into the treating carbon dioxide 11 of a liquid state and the liquid absorbent 14 and returning the separated treating carbon dioxide 11 to the treatment step and the separated liquid absorbent 14 to the purification step. <P>COPYRIGHT: (C)2007,JPO&INPIT |
