High Capacity Thermally Regenerated Supported Amine Sorbents for CO
In this study, a parametric examination of the main factors affecting cyclic CO2 absorption into supported amine sorbents has been conducted. A bench-scale test apparatus and Taguchi statistical design of experiments were used to assess the importance of cycle time, inlet CO2 concentration, residence time, humidity, absorption temperature, desorption temperature and desorption pressure on cyclic CO2 capacity. Two amine sorbents were considered: TEPAN and modified E-100. Amine decomposition, amine oxidation, and the effects of amine chemical composition were also examined. For typical ranges of system variables found on-board the space shuttle orbiter, results indicated that desorption pressure over the range of 25–85 torr, desorption temperature over the range of 50–60°C, absorption temperature over the range of 20–30°C, and CO2 concentration over the range of 6–9 mmHg were the most important variables affecting cyclic CO2 removal capacity. Cycle time, dew point, and residence time were found to be insignificant over the ranges considered. Desorption pressure was found to account for 61% of the variation in the cyclic capacity of CO2 for TEPAN and 82% for E-100. Desorption temperature and absorption temperature accounted for 19% and 6%, respectively, for TEPAN. Desorption temperature and inlet CO2 concentration accounted for 8% and 9%, respectively for E-100.