用于碳捕集的胺基两相吸收剂筛选及性能研究

SCREENING AND PERFORMANCE EVALUATION OF AN AMINE-BASED BIPHASIC SOLVENT FOR CARBON CAPTURE

相较于传统有机胺吸收剂30%MEA,两相吸收剂在降低CO_(2)捕集能耗方面具有更为显著的发展潜力。选用具有不同氨基结构的乙醇胺(MEA)、羟乙基乙二胺(AEEA)、二乙烯三胺(DETA)和三乙烯四胺(TETA)为主吸收剂,分别与分相剂二乙氨基乙醇(DEEA)和水,以1∶2∶1(质量比)复配构建4种两相吸收剂。对其分相性能、吸收-再生性能及黏度特性进行比较研究,发现DEEA+DETA组合为最具开发潜力的两相吸收剂,进一步对其再生能耗及循环稳定性进行深入考察。结果表明:DEEA+DETA两相吸收剂具有较大分相负荷范围和适中的黏度,其吸收负荷为3.26 mol/L,循环容量达2.52 mol/L,再生能耗低至2.55 GJ/t CO_(2),比30%MEA降低了32.9%,且循环稳定性良好。

Compared with the traditional organic amine absorber,30%MEA,the biphasic solvent has more significant development advantages in reducing the energy consumption of CO_(2)capture.In this paper,monoethanolamine(MEA),hydroxyethyl ethylenediamine(AEEA),diethylenetriamine(DETA)and triethylenetetramine(TETA)with different amino structures were selected as the main absorbers and compounded with the phase-splitting agent diethylethanolamine(DEEA)and water in the ratio of 1∶2∶1,to construct four different biphasic absorption systems.Through a comparative study of their phase splitting performance,absorption-desorption performance,and viscosity characteristics,DEEA+DETA was selected as the most promising biphasic absorption system,and its regeneration energy consumption and cycle stability were investigated in detail.The results showed that the biphasic solvent of DEEA+DETA,with a wide range of split-phase loading and moderate viscosity,has an absorption load of up to 3.26 mol/L,a cyclic capacity of 2.52 mol/L,and a low regeneration energy consumption of 2.55 GJ/t CO_(2),32.9%lower than that of 30%MEA.It still maintained high absorption-desorption performance and good cyclic stability after 10 cycles.