Process for CO.sub.2 capture using a regenerable magnesium hydroxide sorbent
Abstract
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.
- Inventors:
- Issue Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1086953
- Patent Number(s):
- 8470276
- Application Number:
- 12/720,766
- Assignee:
- U.S. Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Siriwardane, Ranjani V, and Stevens, Jr., Robert W. Process for CO.sub.2 capture using a regenerable magnesium hydroxide sorbent. United States: N. p., 2013.
Web.
Siriwardane, Ranjani V, & Stevens, Jr., Robert W. Process for CO.sub.2 capture using a regenerable magnesium hydroxide sorbent. United States.
Siriwardane, Ranjani V, and Stevens, Jr., Robert W. Tue .
"Process for CO.sub.2 capture using a regenerable magnesium hydroxide sorbent". United States. https://www.osti.gov/servlets/purl/1086953.
@article{osti_1086953,
title = {Process for CO.sub.2 capture using a regenerable magnesium hydroxide sorbent},
author = {Siriwardane, Ranjani V and Stevens, Jr., Robert W},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2013},
month = {6}
}
Works referenced in this record:
Regenerable sorbents for CO2 capture from moderate and high temperature gas streams
patent, January 2008
- Siriwardane, Ranjani V.
- US Patent Document 7,314,847
A technical and economic evaluation of CO2 separation from power plant flue gases with reclaimed Mg(OH)2
journal, December 2003
- Jung, KyungSook; Keener, TimC.; Khang, Soon-Jai
- Clean Technologies and Environmental Policy, Vol. 6, Issue 3
Novel Regenerable Magnesium Hydroxide Sorbents for CO 2 Capture at Warm Gas Temperatures
journal, February 2009
- Siriwardane, Ranjani V.; Stevens, Robert W.
- Industrial & Engineering Chemistry Research, Vol. 48, Issue 4