科创中国

Highly efficient carbon dioxide capture by a novel amine solvent containing multiple amino groups

• 摘要：

  BACKGROUND: Aqueous solutions of amine are considered to be effective absorbents for CO₂ capture. Special attention is increasingly being given to developing efficient solvents with both high absorption rate and absorption loading for CO₂ capture. RESULTS: A novel amine 2-[(3-aminopropyl)methylamino]ethanol (HMPDA) containing a primary amino group and a tertiary amino group was screened to improve the CO₂ absorption performance. The equilibrium loading of CO₂ in aqueous HMPDA solution was found to be 1.65mol CO₂ mol^-1 HMPDA at 313K and 1 MPa, which is larger than those of conventional amines like monoethanolamine (MEA, 0.75mol CO₂ mol^-1 MEA) and N-methyldiethanolamine (MDEA, 1.05mol CO₂ mol^-1 MDEA) at 313K and 1 MPa. Moreover, the HMPDA solution demonstrated a faster absorption rate of CO₂ than those of MEA and MDEA solutions. The viscosity of HMPDA solution increases by around 66% after CO₂ absorption, which is smaller than the 88% increase of MEA solution. CONCLUSIONS: Efficient results for CO₂ absorption using HMPDA were obtained through assessing the absorption rate, absorption loading of CO₂ and related physical properties. This novel amine shows both fast absorption rate and high absorption loading due to the multiple-site reaction elaborated by the zwitterion and single-step termolecular mechanism.

• 作者：

  Lingdi Cao;Haifeng Dong;香平 张;锁江 张;Zhijun Zhao;Shaojuan Zeng;Jubao Gao

• 刊名：

  Journal of Chemical Technology and Biotechnology

• 在线出版时间：

  2015-10-1