Cement represents about 5% of all carbon emissions worldwide. The second most consumed material in the world after water, concrete is used most widely in the construction industry due to its high compressive strength and other properties. It also has another beneficial quality. Cement, and perhaps plastics, can be used to sequester CO₂.
CO₂ can be recovered from a natural gas-fired boiler and steam reformer flue gas, compressed, and then used for increasing urea and methanol production. Carbon dioxide recovery units have a capacity ranging from 30 to 600 tons per day (TPD) of CO₂. Free low-pressure steam, cooling water, and electricity are available to lower the cost of carbon dioxide recovery. Low capital cost of modular design is key for the wide adoption of this commercial value for CO₂.
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