1D NMR Analysis of a Quaternary MEA–DEAB–CO2–H2O Amine System: Liquid Phase Speciation and Vapor–Liquid Equilibria at CO2 Absorption and Solvent Regeneration Conditions
1D NMR Analysis of a Quaternary MEA–DEAB–CO2–H2O Amine System: Liquid Phase Speciation and Vapor–Liquid Equilibria at CO2 Absorption and Solvent Regeneration Conditions
复制标题
DOI：
10.1021/ie403568p
复制
发表时间：
2014-05
影响因子：
4.2
通讯作者：
Huancong Shi;A. Naami;R. Idem;P. Tontiwachwuthikul
中科院分区：
文献类型：
--
作者：
Huancong Shi;A. Naami;R. Idem;P. Tontiwachwuthikul
为我们最近开发的 1D NMR 校准方法开发了新程序，用于在分别代表 CO2 汽提和吸收条件的高温和低温下对复杂的季 CO2 负载混合胺溶液（例如 MEA-DEAB-CO2-H2O）进行定量液相形态分析。离子形态分析与系统相应的气液平衡 (VLE) 结合进行，以便能够估计可能的二氧化碳捕获性能。在 24 °C 下，使用由 5.0 M MEA 与 0.5、1.0、1.5 和 1.25 M DEAB 溶液混合而成的四种浓度的季胺系统进行了准确的形态分析，其中具有不同的 CO2 负载量，并且首次在更高的温度下仅使用 NMR 校准方法。通过比较，采用新程序的 NMR 校准方法被证明是有效的，并且可能是在较高温度下确定季胺溶液离子形态的唯一方法。
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–DEAB–CO2–H2O at high and low temperatures respectively representing CO2 stripping and absorption conditions. The ion speciation analyses were performed in conjunction with the corresponding vapor–liquid 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 °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.