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Study on mineralization-desorption and regeneration of post-CO2 capture by glycine salt
Received date: 2020-08-11
Online published: 2021-02-06
As a low-energy regeneration process,mineralization-desorption has become the focus of carbon dioxide capture and storage(CCS) technology.In order to study the whole process of mineralization-desorption of CO2-rich absorbent and its regeneration,12 characteristic peaks of potassium glycine solution and its CO2 saturated absorption solution were assigned by ATR-FTIR.Then the characteristic peaks of reactants and products were selected and used to monitor the CaO mineraliza-tion-desorption of CO2 absorbed by potassium glycine solution and its regeneration.The experimental results showed that the contents of protonic ammonia(—NH3+),carbamate(N—COO-) and bicarbonate(HCO3-) decreased with the increase of the pH of the solution in the mineralization-desorption process.The amino content(—NH2) in the solution was continuously generated,indicating that the potassium glycine absorbent was regenerated.Although —NH3+ can completely regenerate back to— NH2,part of N—COO- remains in the absorbent solution.Therefore,calcium oxide mineralization-desorption cannot completely regenerate the potassium glycine absorbent which had absorbed CO2.The results are helpful to further understand the reaction mechanism and kinetics of the CO2 absorbers that have been trapped in the mineralization-desorption process.
Key words: glycine; carbon dioxide capture; mineralization-desorption
Yiyi Li , Qiaoyi Sun , Linge Ma , Jinde Zhuo , Weiguo Song . Study on mineralization-desorption and regeneration of post-CO2 capture by glycine salt[J]. Inorganic Chemicals Industry, 2021 , 53(2) : 38 -41 . DOI: 10.11962/1006-4990.2020-0130
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