The Role of Bicarbonate in Ion Speciation Plots in DEAB and Blended MEA-DEAB Systems, an NMR Study

摘要：

　　The MEA-DEAB-CO2-H2O solutions contain complex ions in the solution.Carbamate (RNH-COO-) and bicarbonate (HCO3-) anions are the major format of CO2 dissolved in the solutions.The ion concentrations of both components are constrained by the reaction equilibrium and VLE model of CO2-amine interactions.For the MEA-COz-H2O systems, the majority of CO20 is carbamate.For the DEAB systems, the majority is bicarbonate.The blended amine system such as MEA-DEAB-CO2-H2O contains both carbamate and bicarbonate at different ratios, which is affected by variations of amine ratio, CO2 loading and operation temperatures.This work summarized VLE plots from 13C NMR analysis of single and blended amine solutions, both in room temperature (24℃) and higher temperature (70℃) to detect trend of the ratio of bicarbonate vs carbamate in the blended amine (MEA-DEAB) systems under both absorption and regeneration conditions.These experimental data indicated the carbamate exchange reaction is endothermic.With increase of temperature, ratio of bicarbonate increased accordingly and that of carbamate decrease.The increased concentrations of bicarbonate can facilitate the amine regeneration with reduced heat duty.

关键词： Vapor Liquid Equilibrium Single/blended amine solutions 13C NMR spectroscopy Carbamate and bicarbonate CO2 absorption and desorption Amine regeneration

作者: Zhi-hao Yu Lin-hua Jiang

作者单位: The Public Experiment Center, Shanghai Key Lab of Modern Optical Systems,University of Shanghai for Science and Technology, Shanghai, 200093, China

会议类型: 国际会议

会议名称: The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)

会议地点: 重庆

会议语种:英文

页码: 870-877

在线出版日期: 2016-07-25（万方平台首次上网日期，不代表论文的发表时间）