CO2 sequestration
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CO2 sequestration is the capture, extraction, separation, collection, etc, of carbon dioxide and a means for its storage or use.
See main article on carbon capture and storage for information on large scale permanent sequestration and/or storage of industrially-produced CO2 into deep saline aquifers, which is proposed as a means of mitigating the accumulation of green houses gases in the atmosphere from fossil fuel burning.
Methods of CO2 sequestration include:
www.netl.doe.gov (PDF file)
Calcium oxide: Carbon Dioxide reacts with quicklime (calcium oxide), to form limestone (calcium carbonate). [3]
Serpentine: The metamorphic mineral serpentine (magnesium silicate hydroxide), is composed of magnesium, silicon and oxygen.
- Molecular Sieve
- Polymer membrane gas separators [6] [7]
- Porous carbon
- Reversing heat exchangers
- Regenerative Carbon Dioxide Removal System (RCRS)
The RCRS on the space shuttle Orbiter uses a two-bed system that provides continuous removal of CO2 without expendable products. Regenerable systems allow a shuttle mission a longer stay in space without having to replenish its sorbent canisters. Older lithium hydroxide (LiOH)-based systems, which are non-regenerable, are being replaced by regenerable metal-oxide-based systems. A metal-oxide-based system primarily consists of a metal oxide sorbent canister and a regenerator assembly. This system works by removing carbon dioxide using a sorbent material and then regenerating the sorbent material. The metal-oxide sorbent is regenerated by pumping air heated to around 400ยบ F at 7.5 scfm through its canister for 10 hours. [8]
www.osti.gov the capture, utilization and disposal of carbon dioxide from fossil fuel-fired power plants(pdf)
News on CO2 Sequestration
- On Friday, February 9, 2007 Sir Richard Branson offered a $25 million prize to anyone who develops a workable means to remove a billion tonnes of carbon dioxide per year from the atmosphere
