Life Characterization of Enhanced Solid Amine CO
In 1991, Hamilton Standard initiated an Independent Research and Development program to enhance the performance characteristics of solid amine based regenerative CO2 removal systems. A solid amine based system had been selected by NASA/JSC for Extended Duration Orbiter missions. As a result of this research effort, two promising new solid amine candidates, designated HSC+ and HSG, were identified. Bench scale testing indicated that these formulations provided 25% to 33% greater initial cyclic capacity when compared to the baseline HSC solid amine sorbent.
This paper reports on comparative life testing of HSC, HSC+ and HSG. The solid amine sorbents were exposed to accelerated life testing with laboratory air under controlled temperature and flow conditions. At various time intervals over a duration of approximately 12,700 hours, the solid amine candidates were packed into a subscale reactor which was designed for evaluating cyclic and equilibrium CO2 capacities under various operating conditions and subjected to a uniform series of performance tests.
Life exposure testing is continuing. To date, the HSG formulation, which provides 25% initial performance margin over HSC, was found to exhibit almost three times better life characteristics than HSC or HSC+, thus offering more stable operation and improved performance for extended missions.