膜基-氨基酸盐及其复合溶液吸收CO2的性能

Performance of CO_2 absorption of membrane-based amino acid salts and its complex solutions

选择了氨基乙酸(GLY)和氨基丙酸(ALA)的盐溶液作为CO2吸收剂,将高效活化剂哌嗪(PZ)添加于GLY形成新型氨基酸基复合溶液,采用膜接触器-再生循环装置,研究了液速、吸收剂浓度等因素对总传质系数和脱除率的影响,评价和比较了GLY和ALA及其复合溶液的吸收性能。结果表明:GLY的传质推动力大于ALA,GLY的总传质系数和脱除率大于ALA;在吸收剂浓度对总传质系数的影响程度上,GLY大于ALA;复合溶液的吸收性能明显优于单一的氨基酸盐溶液,少量的PZ能显著地增强传质效率。

Aqueous amino-acid salts, i.e. glycin （GLY） and alanin （ALA）, were elected as CO2 absorbents. Efficient activator piperazine （PZ） was added into aqueous GLY salts to form a novel aqueous amino-acid-based complex solution. The effects of flowrates and concentrations of absorbents on overall mass transfer coefficient and removal efficiency were investigated by using a membrane eontactor-regeneration cycled setup. The performances of GLY and ALA as well as the complex solution were evaluated. The results show that mass transfer drive-force of GLY is larger than that of ALA. Overall mass transfer coefficient and removal efficiency of GLY are higher than that of ALA. For effect extent of the concentrations of absorbents on overall mass transfer coefficient, GLY is bigger than ALA. The absorbability of complex solution is evidently superior to that of the single amino acid solution, and a little activator PZ can enhance the mass transfer efficiency remarkably.