科研之友
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摘要
Post-combustion Carbon Capture. and, Storage technology (CCS) is viewed as an efficient solution to reduce CO2 emissions of coal-fired power stations. In CCS, an aqueous arnine solution is commonly.used, as a solvent to selectively capture CO2 from the flue gas. However, this process generates additional costs, mostly from the reboiler heat duty required to release the carbon dioxide from the loaded solvent solution. In this work, we present thermodynamic results of CO2 solubility in aqueous amine solutions from a 6-reactor High Throughput Screening (HTS) experimental device. This device is fully automated and designed to perform sequential injections of CO2 within stirred-cell reactors containing the solvent solutions. The gas pressure within eachreactor is monitored as a function of time, and the resulting transient pressure curves are transformed into CO2 absorption isotherms. Solubility measurements are first performed on monoethanolamine diethanolamine, and methyldiethanolamine aqueous solutions at T = 313.15 K. Experimental results are compared with existing data in the literature to validate the HTS device. In addition, a chomprehensive thermodynamic model is used to represent CO2 Solubility variations in different classes of amine structures upon a wide rage of thermodynamic conditions. This model is used to experimental data and to calculate the cyclic capacity which is a key parameter for CO2 process design. Solubility measurements are then performed on a set of 50 monoamines and cyclic capacities are extracted using the thermodynamic model, to asses the potential of these molecules for CO2 capture.
- 出版日期2011-3-15
