CO2 solubility and liquid phase ion speciation determined by C NMR13 technique in IPAB-CO2-H2O system. (July 2016)

• Record Type: Journal Article
• Authors: Liu, Bin; Luo, Xiao; Rongwong, Wichitpan; Idem, Raphael; Liang, Zhiwu
• Is Part Of: International journal of greenhouse gas control. Volume 50(2016:Jul.)
• Page Start: 190
• Page End: 197
• Publication Date: 2016-07
• Subjects: Quantification -- Carbon dioxide -- Absorption -- C NMR13; 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.2016.04.027
• Languages: English
• ISSNs: 1750-5836

Abstract

Abstract : Highlights: A newly developed amine (IPAB) was synthesized and applied into CO2 absorption. New CO2 solubility for the amine at low partial pressure was presented. Calibration equations for protonated and free amine were established by C NMR 13 method. Abstract: A newly developed alkanolamine (4-isopropylamino-2-butanol (IPAB)), with a high carbon dioxide (CO2 ) loading capacity and low regeneration energy, as a potential CO2 absorbent was studied in this work. The accurate quantitative C NMR 13 techniques were selected to investigate the ion speciations in aqueous IPAB-CO2 -H2 O system. Calibration equations were established to quantify the exact ion concentrations of free amines and protonated amines in the IPAB-CO2 -H2 O system. The results show that the NMR method can be used to obtain both qualitative and quantitative information of the amine-CO2 -H2 O system. IPAB had a larger capacity for CO2 than MEA because of the dominant formation of bicarbonate rather than carbamate. No significant carbon peak of carbamate was observed at various CO2 loadings in the IPAB solutions, which can be explained by the sterically hindered effects on the forming of an unstable carbamate.