乙醇胺/多胺的脱碳研究

Study on CO_2 removal by monoethanolamine/polyamine aqueous

工业应用于烟气脱CO2的吸收剂以乙醇胺(MEA)水溶液为主,提高其性能是吸收法脱CO2的关键。对相同浓度的MEA及其与4种多胺,包括N-(2-羟乙基)乙二胺(AEEA)、哌嗪(PZ)、二乙烯三胺(DETA)和三乙烯四胺(TETA),所组成的混胺水溶液(MEA/多胺)对CO2的吸收、再生性能和腐蚀性开展了实验研究。实验结果表明,多胺含量较低的MEA/多胺的吸收和再生性能都较MEA所有提高,腐蚀速度较MEA降低。但是多胺含量增大,再生率有所降低。因此,适当含量多胺的MEA/多胺是较MEA高效的吸收剂;4种混胺中,MEA/DETA和MEA/TETA性能最优。

Aqueous monoethanolamine （MEA） is the mostly used absorbent for removing carbon dioxide （CO2） from fuel gas in the industry. Improving the performances of aqueous MEA is the key for the effective CO2 removal. The absorption, regeneration performances and corrosion properties of MEA and its four blends with polyamines （MEA/polyamines） at the same concentration are studied. The polyamines, including N-（2-hydroxyethyl） ethylenediamine （AEEA）, piperazine （PZ）, diethylenetriamine （DETA） and triethylenetetramine （TETA）, are considered. The results show that the absorption and regeneration capacity of four kind blends of MEA/polyamine are much better than that of MEA when the content of polyamines are low. The corrosion rate of MEA/polyamine is low than that of MEA, However, with the increase of polyamines content in blends, the regeneration rates of the blends decrease. It is concluded that MEA/polyamine with suitable polyamine content is a high efficiency absorption solvent comparing with the performance of MEA/DETA and MEA/TETA are