The impact of trace SO₂ in industrial flue gas on the amine-based chemical absorption of the CO₂ process is a significant concern. This work investigates the impact of trace SO₂ on the chemical absorption of CO₂ by four representative amine absorbents containing a primary amine group of ethanolamine (MEA), a secondary amine group of 2-(ethylamino)ethanol (EMEA), a tertiary amine group of N,N-diethylethanolamine (DEEA), and a sterically hindered amine group of 2-amino-2-methyl-1-propanol (AMP), focusing on their absorption/desorption capacity, cyclic absorption performance, CO₂/SO₂ selectivity, and SO₂ resistance capability. Experimental results revealed that the amine absorbent of MEA with the primary amine group has the highest SO₂ resistance capability, while the amine absorbent of EMEA with the tertiary amine group exhibits the lowest. In addition, CO₂/SO₂ selectivity investigations indicated that the amine absorbent of MEA with the primary amine group has superior selectivity for CO₂ than others. Moreover, NMR analysis revealed that SO₂ more significantly inhibited bicarbonate formation compared to carbamate formation, suggesting that amine absorbents prone to carbamate formation after CO₂ absorption have greater SO₂ resistant capability. Altogether, this work provides valuable insight into the utilization of amine absorbents for the capture of CO₂ in the presence of SO₂.

中文翻译：

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深入了解痕量 SO2 对用于化学吸收 CO2 的胺吸收剂的影响


工业烟气中的痕量 SO₂ 对 CO₂ 工艺中胺基化学吸收的影响是一个重大问题。本工作研究了痕量 SO₂ 对四种代表性胺吸收剂对 CO₂ 的化学吸收的影响，这些吸收剂含有乙醇胺 （MEA） 的伯胺基团、2-（乙氨基）乙醇 （EMEA） 的仲胺基团、N，N-二乙基乙醇胺 （DEEA） 的叔胺基团和 2-氨基-2-甲基-1-丙醇 （AMP） 的空间受阻胺基团， 重点关注它们的吸收/解吸能力、循环吸收性能、CO₂/SO₂ 选择性和 SO₂ 抵抗能力。实验结果表明，具有伯胺基团的 MEA 的胺吸收剂具有最高的 SO₂ 抵抗能力，而具有叔胺基团的 EMEA 胺吸收剂表现出最低的抵抗力。此外，CO₂/SO₂ 选择性研究表明，具有伯胺基团的 MEA 的胺吸收剂对 CO₂ 的选择性优于其他物质。此外，NMR 分析显示，与氨基甲酸酯的形成相比，SO₂ 更显著地抑制了碳酸氢盐的形成，这表明 CO₂ 吸收后容易形成氨基甲酸酯的胺吸收剂具有更强的 SO₂ 抗性。总而言之，这项工作为在 SO₂ 存在下利用胺吸收剂捕获 CO₂ 提供了有价值的见解。