可循环胺类吸收剂用于烟气脱碳的研究

Research on cyclic amines absorber for removal of CO_2 in flue gas

在水相中,将二乙烯三胺(DETA)、三乙烯四胺(TETA)、四羟丙基乙二胺(EDTP)、四甲基乙二胺(TEMED)、三乙烯二胺(TEDA)分别与硼酸(H_3BO_3)等摩尔反应制得胺类烟气脱碳吸收剂。结果表明,TETA/H_3BO_3吸收剂对烟气具有良好的CO_2脱除性能和可再生性能,在吸收温度30.0℃、吸收剂浓度0.60 mol/L的吸收条件下,CO_2吸收容量为0.920 mol/L,脱碳率均大于99.5%,在恒沸温度101.5℃、时间60 min解吸条件下,初次解吸率大于72%。考察了吸收剂TETA/H_3BO_3的重复使用性能,经34次吸收-解吸循环实验结果表明,CO2吸收后富液p H为8.85±0.05,脱碳率均超过99.5%,解吸CO_2后贫液p H为10.40±0.05,后33次解吸效率均大于90%。

In the water phase,novel amine desulfurization absorbents are synthesized by the equimolar reaction of divinyl diethylenetriamine（ DETA）,triethylenetetramine（ TETA）,four hydroxypropyl ethylenediamine（ EDTP）,tetramethyl ethylenediamine（ TEMED） or triethylene diamine（ TEDA） with H3BO3.The results indicate that the absorbent TETA/H3BO3 has an excellent performance on removal efficiency and renewable performance. The efficient absorption capacity to CO2 reaches 0. 920 mol/L,and the removal efficiency of CO2 is more than 99. 5% at 30. 0 ℃ with 0. 6 mol/L absorbent concentration. In azeotropic temperature 101. 5 ℃,60 min desorption conditions,the initial desorption rate is greater than 72%. The reusability of the desulfurization absorbent TETA/H3BO3 is also investigated through thirty four times experiments. It is found that the absorbed rich liquid p H value is 8. 85 ± 0. 05,the removal efficiency of CO2 is still 99. 5% after the CO2 absorption,and the desorpted lean liquid p H value is 10. 40 ±0. 05,the desorption efficiency of CO2 is still more than 90% on average for last thirty three experiments.