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Taking bicarbonate to carbonate releases about 0.8 moles of CO2. This has the opposite effect of what you are intending. See the below link for a discussion o
by ccr-yc 5y ago
Taking bicarbonate to carbonate releases about 0.8 moles of CO2. This has the opposite effect of what you are intending. See the below link for a discussion of the mechanism for how taking carbonate (i.e. limestone) to bicarbonate sequesters carbon. Please don't just run this reaction in reverse. That's almost as bad as our current process for making cement. If you're doing something different (e.g. adding a counterion to replace calcium), then where does this come from?
- thatcat 5y agoSeems the co2 binds the proprietary alkaline sorbent when released from the Ca/Mg.
- pankajdoharey 5y agoIt seems what they do is Ocean Water + Sorbent -> Leaches Carbonates for use in Cement -> Heated in Kiln -> Releases C02 -> Captured and redissolved in Ocean water. This still has to be proved how to reabsorb such large amounts of c02 in ocean water.
- galacticdessert 5y agoAbsorbing large amounts of CO2 happens every second since 2-3 centuries at this point, and is the main driver of ocean acidification and subsequent coral bleaching, loss of wildlife, etc. If the mentioned process could "recycle" the CO2 needed for lime production, then it could be a big win for a very hard to decarbonize sector. What is still to be checked is how more expensive this lime will be, and how it will stack up compared with traditional limestone+carbon tax
- pankajdoharey 5y agoPrice can be justified, if the government puts carbon tax on cement companies who dump large quantities of CO2 in the atmosphere.