Species distribution of CO2 absorption/desorption in aqueous and non-aqueous N-ethylmonoethanolamine solutions. (April 2016)

• Record Type: Journal Article
• Authors: Chen, Siming; Chen, Shaoyun; Zhang, Yongchun; Qin, Liang; Guo, Chao; Chen, Jian
• Is Part Of: International journal of greenhouse gas control. Volume 47(2016:Apr.)
• Page Start: 151
• Page End: 158
• Publication Date: 2016-04
• Subjects: CO2 -- N-ethylmonoethanolamine (EMEA) -- Non-aqueous -- Absorption−desorption -- 13C NMR; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2016.01.046
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: EMEA + ethanol solution had a much lower CO2 capacity than EMEA + H2 O solution. EMEA + ethanol solution had a much higher EMEA regeneration efficiency than EMEA + H2 O solution. The concentration of alky carbonate was lower than bicarbonate/carbonate. The existence of bicarbonate prevented the carbamate decomposing during desorption. Abstract: The CO2 absorption and desorption in N -ethylmonoethanolamine (EMEA) solutions were carried out using an absorption−desorption apparatus and the species distribution was explored using the quantitative 13 C NMR spectroscopy. EMEA + ethanol solution had a much lower CO2 loading (0.547 mol CO2 /mol EMEA) than EMEA + H2 O solution (0.799 mol CO2 /mol EMEA) due to the lower concentration of alky carbonate generated in EMEA + ethanol solution than the corresponding bicarbonate/carbonate as generated in EMEA + H2 O solution and the no further reaction of carbamate with CO2 in EMEA + ethanol solution. The EMEA regeneration efficiency of the EMEA + ethanol solution at 363, 373 and 383 K (55.44, 86.86 and 100.00%) was much higher than EMEA + H2 O solution at corresponding temperatures (27.56, 30.25 and 38.80%), which was mainly influenced by the decomposition of carbamate, while the existence of bicarbonate prevented carbamate decomposing.