Technology:
Nippon Steel and Sumitomo Metal developed a plant to recover carbon dioxide and recycle the
recovered carbon dioxide for a material of industrial gases with 40% smaller
amount of energy than the existing plant. The new plant uses special liquid for
efficient absorption of CO2 that Nippon Steel and Sumitomo Metal developed in
collaboration with Research Institute of Innovative Technology for the Earth.
The special absorption liquid is sprayed inside the tank filled with exhaust
fumes, and subsequently the special absorption liquid that contains CO2 is
transferred to another tank and heated to discharge CO2. The discharged CO2 is
used for industrial gases, carbonated drinks, and a raw material of dry ice.
Unlike the existing plant that needs to heat the absorption liquid containing
CO2 to 120 degrees centigrade, the new plant has to heat only to 95 degrees
centigrade. In addition, heat generated in the process to absorb CO2 contained
in the exhaust fumes can also be recycled. Accordingly, the required heat
energy can be reduced by 43%.
Nippon Steel and Sumikin Engineering will market the new technology to industrial gas companies
both at home and abroad. Enhanced oil recovery, the technology to infuse
unproductive oil fields with CO2 to increase oil production, attracts attention
worldwide especially from Asia and Africa. The plant to recover 50,000 tons of
CO2 is priced at 2 billion yen and that to recover 1 million tons of CO2 is
priced at 9 billion yen. There are two kinds of technologies to recover CO2
from exhaust fumes. The chemical absorption method uses alkali solution that
absorbs CO2 with the help of a chemical reaction, while the physical absorption
method uses methanol and takes in CO2 applying high pressure.
Enhanced Oil
Recovery
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