密闭空间低浓度CO_2固态胺吸附剂长寿命评价

An assessment of life-cycles on solid amine for adsorbing low-concentration CO_2 in confined spaces

在密闭空间实际工况下,通过两组平行对照试验,考察了长时间吸脱附循环对固态胺材料CO2吸附性能的影响,对材料进行长寿命试验,并验证一年内固态胺材料性能的稳定性。结果表明,两组试验分别经过2128轮和2267轮吸脱附循环后,固态胺材料仍表现出良好的吸脱附稳定性。在长寿命试验条件下,两组吸附剂的CO2的吸附量维持在约28 mg·g-1,有机胺含量未见流失,活性胺含量比初始材料有所提高并不再降低,材料机械强度未受到影响。结果证明,高分子树脂基固态胺材料不仅能在室温条件下高效吸附CO2,且能在温和条件下实现CO2的解吸,在减少能耗的同时还有利于材料使用寿命的延长,适宜作为太空密闭空间中去除低浓度CO2的吸附材料,为航天员的生命保障提供技术支撑。

To meet the requirement of a life support system, it is essential to develop an adsorbent with high stability and efficiency for removing low-concentration CO2 in confined spaces, such as spacecraft, space laboratory and submarine. Solid amine adsorbent was prepared by impregnating a polymer substrate with tetraethylenepentamine （TEPA）, and its performance and stability in adsorption/desorption cycles under actual working condition for the removal of CO2 in confined spaces were examined. Test of long period life （about one year） was carried out to verify its stability. The results showed that the adsorption performance remained stable after 2128 and 2267 cycles. Under the condition of the life tests, CO2 adsorption capacities were maintained at ～28 mg·g^-1. Moreover, no significant loss of organic amine was found according to thermal analysis and CO2 titration, and the high mechanical strength was still kept. It demonstrated that high adsorption efficiency of CO2 on the solid amine adsorbent at room temperature （20℃） was achieved and the CO2 desorption process can be conducted at the mild conditions （30℃）, which is not only beneficial for reduction of energy consumption but also extend the service life. Therefore, the solid amine adsorbent, TEPA supported onto polymer substrate, could effectively be alternative for removal of CO2 in confined spaces.