1D NMR Analysis of a Quaternary MEA鈥揇EAB鈥揅O2鈥揌2O Amine System: Liquid Phase Speciation and Vapor鈥揕iquid Equilibria at CO2 Absorption and Solvent Regeneration Condition

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• 作者：Huancong Shi ; Abdulaziz Naami ; Raphael Idem ; Paitoon Tontiwachwuthikul
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：May 21, 2014
• 年：2014
• 卷：53
• 期：20
• 页码：8577-8591
• 全文大小：762K
• 年卷期：v.53,no.20(May 21, 2014)
• ISSN：1520-5045

文摘

New procedures were developed for our recently developed 1D NMR calibration method for quantitative liquid phase speciation analysis of a complex quaternary CO₂ loaded blended amine solution such as MEA鈥揇EAB鈥揅O₂鈥揌₂O at high and low temperatures respectively representing CO₂ stripping and absorption conditions. The ion speciation analyses were performed in conjunction with the corresponding vapor鈥搇iquid equilibrium (VLE) of the system to enable the estimation of possible CO₂ capture performance. Accurate speciations were performed for a quaternary amine system using four concentrations consisting of 5.0 M MEA blended with 0.5, 1.0, 1.5, and 1.25 M DEAB solutions with different CO₂ loadings at 24 掳C, and for the first time, at higher temperatures using only the NMR calibration method. By comparison, the NMR calibration method with the new procedures was shown to be valid and perhaps the only approach for determining ion speciation for quaternary amine solutions at higher temperatures.