Ammonia Absorption and Desorption in Ammines

Collin Smith, Mahdi Malmali, Chen-Yu Liu, Alon McCormick, E L Cussler*, University of Minnesota, USA

15th Annual NH3 Fuel Conference, Pittsburgh, PA, October 31, 2018
NH3 Energy+ Topical Conference at the AIChE Annual Meeting

ABSTRACT

While adsorption onto solids is a common separation process, absorption into solids is much less often used. The reason is that absorption is usually assumed ineffective because it includes very slow solute diffusion into the solid. An exception may be the separation of ammonia from nitrogen and hydrogen using ammines, especially at temperatures close to those used in ammonia synthesis. There, ammonia can be selectively absorbed by calcium chloride; nitrogen and hydrogen are not absorbed. The kinetics of ammonia release seem to be diffusion controlled. The kinetics of absorption are consistent with a first order reaction and diffusion in series, so the rate controlling step changes with the amount of absorption. The potential of this separation in the distributed production of ammonia is discussed both as a source of fertilizer and as a means of wind energy storage.

Read the abstract at the AIChE website.

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RELATED NH3 FUEL CONFERENCE PAPERS

2018: Design Optimization of an Ammonia-Based Distributed Sustainable Agricultural Energy System
2017: Design Optimization of a Distributed Ammonia Generation System
2017: Lower Pressure Ammonia Synthesis
2016: Small Scale Low-Pressure Ammonia Synthesis
2015: Potential Strategies for Distributed, Small-Scale Sustainable Ammonia Production [PDF]
2014: Life-cycle greenhouse gas and energy balance of community-scale wind powered ammonia production
2013: Ammonia Production Using Wind Energy
2012: Lessons Learned in Developing a Wind-to-Ammonia Pilot Plant [PDF]
2011: Production of Anhydrous Ammonia from Wind Energy — Anatomy of a Pilot Plant, The Sequel [PDF]
2010: Production of Anhydrous Ammonia from Wind Energy — Anatomy of a Pilot Plant [PDF]
2009: Ammonia from Wind, Progress Update [PDF]
2008: Ammonia from Wind, an Update [PDF]
2007: Ammonia from Wind, an Update [PDF]
2006: Wind to Ammonia [PDF]

LINKS

Department of Chemical Engineering and Materials Science, University of Minnesota
West Central Research & Outreach Center, University of Minnesota
Learn more about the 2018 NH3 Fuel Conference

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