Process for CO.sub.2 capture using a regenerable magnesium hydroxide sorbent

Patent · Tue Jun 25 04:00:00 EDT 2013

OSTI ID:1086953

Siriwardane, Ranjani V; Stevens, Jr., Robert W

A process for CO.sub.2 separation using a regenerable Mg(OH).sub.2 sorbent. The process absorbs CO.sub.2 through the formation of MgCO.sub.3 and releases water product H.sub.2O. The MgCO.sub.3 is partially regenerated through direct contact with steam, which acts to heat the magnesium carbonate to a higher temperature, provide heat duty required to decompose the magnesium carbonate to yield MgO and CO.sub.2, provide an H.sub.2O environment over the magnesium carbonate thereby shifting the equilibrium and increasing the potential for CO.sub.2 desorption, and supply H.sub.2O for rehydroxylation of a portion of the MgO. The mixture is polished in the absence of CO.sub.2 using water product H.sub.2O produced during the CO.sub.2 absorption to maintain sorbent capture capacity. The sorbent now comprised substantially of Mg(OH).sub.2 is then available for further CO.sub.2 absorption duty in a cyclic process.

• Research Organization: NETL (National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV (United States))
• Sponsoring Organization: USDOE
• Assignee: U.S. Department of Energy (Washington, DC)
• Patent Number(s): 8,470,276
• Application Number: 12/720,766
• OSTI ID: 1086953
• Country of Publication: United States
• Language: English

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