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OH- +OCO O Although various classes of amines have been explored, including chilled ammonia itself, improvements in the ability to separate CO2 by this approach have been incremental. Further, these separations are primarily driven by temperature swing (i.e., absorption at low temperature, desorption at high temperature), a reliable but not necessarily optimally efficient means. Nonetheless, these relatively mature methods are the ones most commonly discussed and most actively developed for use in postcombustion carbon capture. HO O- The capture of CO2 by aqueous amines has been practiced for over 80 years removal of CO2 from natural gas and hydrogen and in producing beverage-grade CO2. In a typical process, flue gas that contains CO2 is contacted with an aqueous amine solvent in an absorber column at a relatively low temperature and is absorbed. The loaded solvent is pumped to a stripping column where it is heated to regenerate the solvent and release the CO2. The hot regenerated solvent is then returned to the absorber column through a heat exchanger, which cools the hot solvent and preheats the rich solvent going to the stripper. Most of the energy required to capture CO2 is consumed in heating the rich solvent in the stripper column. Aqueous Amines for CO2 Separation 3 in the It is essential to consider the entire CO2 capture process when evaluating the efficiency and energy cost of capture. For example, developing a solvent with a low absorption energy for a thermal swing regeneration may not result in an energy savings because of the need for additional heat to maintain pressure, or the need for additional compressors downstream of the absorber to obtain sequestration pipeline pressures.4 Alternatively, the low absorption energy solvent may work more efficiently in a vacuum desorption process.5 The original patented process for aqueous amine solvent scrubbing.3 11PDF Image | 2020 Carbon Capture
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