Development of a Conceptual Process for Selective Capture of CO2 from Fuel Gas Streams Using Two TEGO Ionic Liquids as Physical Solvents

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• 作者：Omar M. Basha ; Yannick J. Heintz ; Murphy J. Keller ; David R. Luebke ; Kevin P. Resnik ; Badie I. Morsi
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：February 26, 2014
• 年：2014
• 卷：53
• 期：8
• 页码：3184-3195
• 全文大小：933K
• 年卷期：v.53,no.8(February 26, 2014)
• ISSN：1520-5045

文摘

Two ionic liquids (ILs), TEGO IL K5 and TEGO IL P51P, were used as physical solvents to develop a conceptual process for COub>2ub> capture from a shifted warm fuel gas stream produced from Pittsburgh no. 8 coal for a 400 MWe power plant. The physical properties of the two ILs and the solubilities of COub>2ub>, Hub>2ub>, Nub>2ub>, and Hub>2ub>S in the TEGO IL K5 solvent, as well as those of COub>2ub> and Hub>2ub> in the TEGO IL P51P solvent, were measured in our laboratories at pressures up to 30 bar and temperatures from 300 to 500 K. The Peng鈥揜obinson equation-of-state (P-R EOS) with Boston鈥揗athias (BM) 伪 function and standard mixing rules was used in the development of the process, and the solubility data were used to obtain the binary interaction parameters (未ub>ijub> and lub>ijub>) between the shifted gas constituents and the two ILs. The binary interaction parameters were then correlated as functions of temperature. The conceptual process consists of four identical adiabatic packed-bed absorbers (4.5 m i.d., 27 m height, packed with 0.0254 m plastic Pall Rings) arranged in parallel for COub>2ub> capture, three flash drums arranged in series for solvent regeneration,and two pressure/intercooling systems for separating and pumping COub>2ub> to sequestration sites. The compositions of all process streams, COub>2ub> capture efficiency, and net power were calculated using Aspen Plus for the two solvents. The results showed that TEGO IL K5 and TEGO IL P51P were able to capture 91.28% and 90.59% of COub>2ub> in the fuel gas stream, respectively.