Global warming has been issue of great concern in the world, and in this connection, carbon dioxide is the main greenhouse gas that humans add into the atmosphere. In particular, industrial plants that burn fossil fuels constitute a major source of the carbon dioxide emissions contributing to global...
Global warming has been issue of great concern in the world, and in this connection, carbon dioxide is the main greenhouse gas that humans add into the atmosphere. In particular, industrial plants that burn fossil fuels constitute a major source of the carbon dioxide emissions contributing to global climate change. For the next several decades, carbon capture and storage may be the most effective way of substantially reducing carbon dioxide emissions to the atmosphere. The wet absorption process, which is a post-combustion CO2 capture technology using liquid absorbent, has been studied extensively in many countries for its ability to process high concentrations of CO2 using retrofits of the existing process. The most important consideration in any CO2 absorption process is the selection of the absorbent, as this will determine the performance of the process. In general, alkanolamine absorbents are effectively used to remove acid gas. Although it features a fast absorption rate and a high alkalinity, it has the drawbacks of loss of absorbent due to degradation and corrosion of the equipment as well as the high amounts of energy required for absorbent regeneration. To solve these problems, the absorption of CO2 using an amino acid salt solution as an alternative absorbent was studied. The advantages of the amino acid salt solutions include a high surface tension and low evaporation because of outstanding solubility by ionic structure. The formation of bicarbonate and salt in the reaction of absorbent and CO2 lead to low regeneration energy. The solubility of CO2 was investigated with semi-batch reactor at 40, 50 and 60 ℃ and absorbent concentration of 1, 2, 3 and 4 M. K+L-proline solution showed the higher absorption capacity 0.1 mol CO2/mol absorbent than the MEA. The absorption capacity of K+L-lysine solution was approximately 1.85~1.98-Times larger than that of MEA. The absorption capacity was decreasing the increasing reaction temperature. The absorption rate of CO2 was measured using a Wetted-wall column at 40, 50 and 60 ℃ and absorbent concentration of 0.5, 1, 1.5 and 2 M. The absorption rate was increased with increasing reaction temperature and concentration. In the same experimental conditions, the absorbent rate follows the sequence of K+L-proline > K+L-lysine > MEA > AMP. The heat of reaction between the solvent and absorbed CO2 molecules was measured in differential reaction calorimeter(DRC) for comparing with generation efficiency of amine solvent at 25 ℃. The heat of reactions (kJ/mol CO2) of K+L-proline solution and MEA, AMP solution was approximately 79.13, 88.24 and 83.95 at 25 ℃, respectively. The salt formation concentration of K+L-lysine solution for water are 2.5 M, 3 M, 3.5 M, 4 M at 25 ℃ and all CO2 concentration except 5% CO2. Also, The salt formation concentration was 3 M, 3.5 M, 4 M at 60 ℃. The salt formation concentration of K+L-proline solution for water are 4 M at 25 ℃ and 5% CO2 concentration, 3.5 M and 4 M at 25 ℃ and 10% CO2 concentration, 3 M at 25 ℃ and 10~30% CO2 concentration and salt formation absorption concentration was 4 M at 60 ℃ and 30% CO2. NMR spectroscopy was used to identify the species in the K+L-lysine, K+L-proline, MEA and AMP solutions. It is found that the aqueous K+L-lysine and K+L-proline solutions react with CO2 and form the carbamate and bicarbonate/carbonate. The formation of the bicarbonate/carbonate in the aqueous K+L-lysine and K+L-proline solution was predominant because the stability of the carbamate was low.
Global warming has been issue of great concern in the world, and in this connection, carbon dioxide is the main greenhouse gas that humans add into the atmosphere. In particular, industrial plants that burn fossil fuels constitute a major source of the carbon dioxide emissions contributing to global climate change. For the next several decades, carbon capture and storage may be the most effective way of substantially reducing carbon dioxide emissions to the atmosphere. The wet absorption process, which is a post-combustion CO2 capture technology using liquid absorbent, has been studied extensively in many countries for its ability to process high concentrations of CO2 using retrofits of the existing process. The most important consideration in any CO2 absorption process is the selection of the absorbent, as this will determine the performance of the process. In general, alkanolamine absorbents are effectively used to remove acid gas. Although it features a fast absorption rate and a high alkalinity, it has the drawbacks of loss of absorbent due to degradation and corrosion of the equipment as well as the high amounts of energy required for absorbent regeneration. To solve these problems, the absorption of CO2 using an amino acid salt solution as an alternative absorbent was studied. The advantages of the amino acid salt solutions include a high surface tension and low evaporation because of outstanding solubility by ionic structure. The formation of bicarbonate and salt in the reaction of absorbent and CO2 lead to low regeneration energy. The solubility of CO2 was investigated with semi-batch reactor at 40, 50 and 60 ℃ and absorbent concentration of 1, 2, 3 and 4 M. K+L-proline solution showed the higher absorption capacity 0.1 mol CO2/mol absorbent than the MEA. The absorption capacity of K+L-lysine solution was approximately 1.85~1.98-Times larger than that of MEA. The absorption capacity was decreasing the increasing reaction temperature. The absorption rate of CO2 was measured using a Wetted-wall column at 40, 50 and 60 ℃ and absorbent concentration of 0.5, 1, 1.5 and 2 M. The absorption rate was increased with increasing reaction temperature and concentration. In the same experimental conditions, the absorbent rate follows the sequence of K+L-proline > K+L-lysine > MEA > AMP. The heat of reaction between the solvent and absorbed CO2 molecules was measured in differential reaction calorimeter(DRC) for comparing with generation efficiency of amine solvent at 25 ℃. The heat of reactions (kJ/mol CO2) of K+L-proline solution and MEA, AMP solution was approximately 79.13, 88.24 and 83.95 at 25 ℃, respectively. The salt formation concentration of K+L-lysine solution for water are 2.5 M, 3 M, 3.5 M, 4 M at 25 ℃ and all CO2 concentration except 5% CO2. Also, The salt formation concentration was 3 M, 3.5 M, 4 M at 60 ℃. The salt formation concentration of K+L-proline solution for water are 4 M at 25 ℃ and 5% CO2 concentration, 3.5 M and 4 M at 25 ℃ and 10% CO2 concentration, 3 M at 25 ℃ and 10~30% CO2 concentration and salt formation absorption concentration was 4 M at 60 ℃ and 30% CO2. NMR spectroscopy was used to identify the species in the K+L-lysine, K+L-proline, MEA and AMP solutions. It is found that the aqueous K+L-lysine and K+L-proline solutions react with CO2 and form the carbamate and bicarbonate/carbonate. The formation of the bicarbonate/carbonate in the aqueous K+L-lysine and K+L-proline solution was predominant because the stability of the carbamate was low.
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