Development of an Analytical Method for Distinguishing Ammonium Bicarbonate from the Products of an Aqueous Ammonia CO2 Scrubber

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• 作者：Lingyu Meng ; Stuart Burris ; Holt Bui ; and Wei-Ping Pan
• 刊名：Analytical Chemistry
• 出版年：2005
• 出版时间：September 15, 2005
• 年：2005
• 卷：77
• 期：18
• 页码：5947 - 5952
• 全文大小：121K
• 年卷期：v.77,no.18(September 15, 2005)
• ISSN：1520-6882

文摘

The link between anthropogenic emissions of carbondioxide, increasing atmospheric CO₂ levels, and concomitantly increasing global temperatures is established andaccepted. The use of aqueous ammonia, to capture CO₂and produce an inexpensive nitrogen fertilizer, ammonium bicarbonate (ABC), is believed to be a feasibleapproach to CO₂ sequestration. Due to the varying concentrations of reactants and varying reaction conditions,different ammonia-carbon compounds may be produced.ABC is the ideal product for maximizing NH₃ utilizationin CO₂ capture; therefore, identification and quantificationof ABC in the reaction products is mandatory. Variousanalytical techniques were used to distinguish and quantify the ABC. Fourier transform infrared spectroscopy canonly be used to distinguish ammonium carbamate, and.X-ray diffraction can be used to qualitatively distinguishABC from the other possible products of the CO₂ capturereaction. Carbon-hydrogen-nitrogen elemental analysisand near-infrared (NIR) spectroscopy were used to quantify ABC, with both techniques giving ±5% agreement forABC concentrations for 8 of 13 samples from a bench-scale aqueous ammonia CO₂ scrubbing system. An additional 3 of the 13 samples were within ±12%. Resultsindicate that NIR will be an ideal tool for real-time, on-line measurements of ABC in a full-scale aqueous ammonia CO₂ scrubber. The ABC in 11 samples from thebench-scale scrubber at Western Kentucky University wasdetermined by these techniques and assessed to have verygood quality as a fertilizer in accordance with GB-3559-92, the Agricultural Ammonium Bicarbonate NationalStandard of China.