Executive Summary
Technical Challenge
- Determining optimum operating conditions of absorption and desorption with minimum absorbent degradation
- Utilizing as much absorbent as possible before ammonia breakthrough
- Using data from bench scale module to advance design and TEA at scales of interest for commercial projection (ca. 30 ton/day)
Potential Impact
It stands to reason that optimal design for modular, small-scale, distributed ammonia production will be very different than for the largest current continent-scale facility. This project’s approach to ammonia separation via salt absorption can work near ambient or near reaction temperatures, avoiding the capital needed for traditional condensation. In addition to this, studies to date suggest that absorption can remove ammonia at lower ammonia partial pressures and return a lower partial pressure to the reactor. This may lessen the need for the reactor to operate at a conventially high pressure, further reducing capital costs and safety concerns. TEA, systems optimization, and supply chain analysis so far support absorption’s competitiveness in modular distributed ammonia production.
Resources
The University of Minnesota ammonia team encompasses both chemical engineering at the Twin Cities campus and renewable energy expertise at the West Central Research and Outreach Center in Morris, MN. The project team will consist of experts in modeling, reaction engineering, separations, renewable energy, module design, and more. In addition the project team will have full access to the new ARPA-E funded prototype for absorption-enhanced synthesis and/or absorber testing. It is computer controlled and is designed to process more than 1 kg/day of ammonia.