Mitsubishi Heavy Industries, Ltd. (MHI) has completed installation of a carbon dioxide (CO2) capture unit at Nippon Ekitan Corporation’s Mizushima Plant in Kurashiki, Okayama Prefecture, Japan.

The new unit offers a recovery capacity of 283 metric tonnes per day (mtpd). It will capture CO2 from Mitsubishi Chemical Corporation’s (MCC) Mizushima Plant, and feed it to Nippon Ekitan’s new liquefied carbonic acid gas production facility.

MHI licensed its CO2 capture technology to Mitsubishi Chemical Engineering Corporation, which handles engineering, procurement and construction (EPC) of the new liquefied carbonic acid gas production facilities. MHI oversaw the basic design of the CO2 capture unit and supplied its core components.

Nippon Ekitan is a group company of Taiyo Nippon Sanso Corporation, which operates a carbonic acid gas business in Japan. The company mainly purchases high-concentration carbonic acid gas from petrochemical firms, ammonia manufacturers, and other producers, liquefies and refines it, and then markets it as liquefied carbonic acid gas and dry ice.

This new liquefied carbonic acid gas production facility uses an absorption solvent to separate and capture CO2 from low-concentration carbonic acid gas from Mitsubishi Chemical’s Mizushima Plant, where Nippon Ekitan’s Mizushima Plant is located, to produce high-quality liquefied carbonic acid gas.

The liquefied carbonic acid gas facility will help to further ensure a stable supply of carbonic acid gas from Nippon Ekitan in the Chugoku and Shikoku regions, and Kansai area.

MHI’s CO2 capture technology, which utilises the KM CDR Process™, uses an advanced absorption solvent (KS-1™) jointly developed with Kansai Electric Power Co., Inc. to achieve significant reductions in energy consumption compared with earlier methods. Since 1999 this technology has been adopted at 12 plants worldwide, capturing CO2 from the flue gas of boilers fired by coal or natural gas.

Going forward, MHI will continue to make contributions to sustainable economic development and environmental protection through proactive efforts to expand its advanced CO2 capture technology.

CO2 capture unit at Nippon Ekitan's Mizushima plant

CO2 capture unit at Nippon Ekitan’s Mizushima plant

In addition to the production of liquefied carbonic acid gas and dry ice, MHI’s CO2 capture technology can be employed for a wide range of uses, including chemical applications such as production of urea, methanol and dimethyl ether (DME), capture and storage of CO2 emitted by thermal power plants and other facilities, and enhanced oil recovery (EOR), a method of increasing crude oil production by injecting CO2 into oil reservoirs.