基于AEEA的二元复合胺试剂吸收CO2降解性能研究

Study on the Degradation of AEEA Based Mixed Amines in CO_2 Absorption

针对当前有机胺法吸收剂在工业运行过程中降解失效的现状,以AEEA复合试剂为测试对象,采用玻璃搅拌反应釜进行吸收/解吸反应,联合高压反应釜开展氧化降解测试,研究复合胺吸收剂的降解性能。按照质量比例20:1,20:3,20:5,在AEEA试剂中分别添加DEA、PZ、MDEA组成9种总质量分数都为10%的二元复配溶液,研究对比了9种复配胺溶液吸收负荷、吸收速率、再生速率、再生率,优选出三种最优复配吸收剂,吸收效果由高到低排列:20:5 AEEA+PZ>20:1 AEEA+DEA>20:3 AEEA+MDEA。对三种混合胺溶液进行连续6次吸收和解吸,研究考察了降解过程:经6次循环实验后,以AEEA为主的三种复配溶液及AEEA单胺溶液胺降解程度由大到小排序为:20:1AEEA+DEA>AEEA>20:3 AEEA+MDEA>20:5 AEEEA+PZ,得出AEEA与DEA复配会促进胺降解,而AEEA与PZ复配则会抑制胺降解。

Organic amide absorbents often show degradation in industrial operation. AEEA （2-（2-aminoethylamino） ethanol） composite reagents were used to study the degradation of amine absorbers using a glass stirred reactor for adsorption/desorption, which combined with a high pressure reactor to investigate oxidative degradation. DEA （diethanol amine）, PZ （piperazine） and MDEA （N-methyldiethanolamine） were added into AEEA respectively （with weight ratio of 20：1, 20：3 and 20：5 for each chemical） to obtain nine binary complex solutions and the total chemical mass fraction were all 10%. Absorption loading, absorption rate, regeneration rate and regeneration percentage of the 9 solutions are compared and three optimal composite absorbents are found as 20：5 AEEA ＋ PZ 〉 20：1 AEEA＋DEA 〉 20：3 AEEA ＋ MDEA. These three absorbents were tested for 6 times with continuous adsorption and desorption. The results show that the degradation of the three AEEA-based adsorbents and AEEA monoamine solutions are in an order of 20：1 AEEA＋DEA 〉 AEEA 〉 20：3 AEEA＋MDEA 〉 20：5 AEEEA ＋ PZ, which indicate that the combination of AEEA and DEA can promote amine degradation, while the combination of AEEA and PZ can inhibit amine degradation.