Effect of the presence of trace sulfur dioxide on piperazine-based amine absorbents for carbon dioxide capture

doi:10.1016/j.cjche.2024.05.003

Abstract

Abstract: The effect of the presence of trace SO₂ in industrial flue gas on the amine-scrubbing-based absorption process for CO₂ capture has been a matter of concern. This study aimed to investigate the effect of trace SO₂ on the CO₂ capture process using piperazine-based amine absorbents, focusing on SO₂-resistance capability, SO₂/CO₂ absorption selectivity, and cyclic stability. The presence of trace SO₂ not only restrains CO₂ absorption, but also promotes the formation of carbamate within the piperazine-based amine absorbents. Remarkably, the incorporation of aminoethyl group in piperazine-based amine absorbents can enhance the SO₂-resistance capability by promoting the formation of carbamate, while piperazine-based amine absorbents with hydroxyethyl group can promote the formation of bicarbonate to reduce the SO₂-resistance capability. The work offers valuable insights into the efficient application of novel amine absorbents for CO₂ capture from practical industrial flue gas.

Key words: CO₂ capture, Piperazine, Amine absorbent, Trace SO₂, Absorption

摘要： The effect of the presence of trace SO₂ in industrial flue gas on the amine-scrubbing-based absorption process for CO₂ capture has been a matter of concern. This study aimed to investigate the effect of trace SO₂ on the CO₂ capture process using piperazine-based amine absorbents, focusing on SO₂-resistance capability, SO₂/CO₂ absorption selectivity, and cyclic stability. The presence of trace SO₂ not only restrains CO₂ absorption, but also promotes the formation of carbamate within the piperazine-based amine absorbents. Remarkably, the incorporation of aminoethyl group in piperazine-based amine absorbents can enhance the SO₂-resistance capability by promoting the formation of carbamate, while piperazine-based amine absorbents with hydroxyethyl group can promote the formation of bicarbonate to reduce the SO₂-resistance capability. The work offers valuable insights into the efficient application of novel amine absorbents for CO₂ capture from practical industrial flue gas.

关键词: CO₂ capture, Piperazine, Amine absorbent, Trace SO₂, Absorption

Songtao Zheng, Yao Jiang, Shaojun Jia, Yan Wu, Peng Cui. Effect of the presence of trace sulfur dioxide on piperazine-based amine absorbents for carbon dioxide capture[J]. Chinese Journal of Chemical Engineering, 2024, 73(9): 34-41.

Songtao Zheng, Yao Jiang, Shaojun Jia, Yan Wu, Peng Cui. Effect of the presence of trace sulfur dioxide on piperazine-based amine absorbents for carbon dioxide capture[J]. 中国化学工程学报, 2024, 73(9): 34-41.

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