Carbon Dioxide CO2 Capture Using Amino Acid Salt Solution (original) (raw)
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Selection of Amine Amino Acids Salt Systems for CO2 Capture
Energy Procedia, 2013
Several amino acids including Glycine, L-Alanine, Taurine, Sarcosine, L-Serine, L-Proline, blended with monoethanolamine (MEA) in presence of different amounts of CO 2 were qualitatively and quantitatively studied by NMR spectroscopy. 1D and 2D NMR were employed to qualitatively determine the carbamate formation from the amine group of the amino acids. All species were identified and reported in this work. The preliminary quantitative 13 C NMR have shown that the highest carbamate formation occurs in the loaded taurine-MEA system and the lowest in the loaded L-alanine-MEA system. In the present work, the complete neutralization of sarcosine with MEA did not occur because of the carbamate formation of the amine group of the MEA.
EngRN: Materials in Energy (Topic), 2019
This pilot plant study covered the CO2 absorption potential of a novel bi-solvent blend containing AMP and 1,5–diamino–2–methylpentane (DA2MP). The CO2 concentration was kept at 15.1 vol.% to represent the flue gas from a coal-fired power plant. The simulated flue gas flow rate and the amine volumetric flow rate were 14 SLPM and 50 ml/min respectively. Comparative CO2 absorption analysis was conducted for the AMP-DA2MP blend and MEA (5 kmol/m3 or 30 wt.%). The concentration of AMP is 2 kmol/m3 while that of DA2MP was varied from 2 kmol/m3 to 3 kmol/m3 making the total concentration 4 kmol/m3 and 5 kmol/m3. The comparative analysis is based on rich amine loading, CO2 absorption rate, absorber overall mass transfer coefficient, and initial amine solution cost. The parametric effect of lean amine loading on the above-mentioned parameters was also investigated. Pilot plant results showed that the rich amine loading, CO2 absorption rate and absorber mass transfer coefficient of the AMP-D...
Energy Procedia, 2014
The ionization constants and carbamate stability constants for post combustion CO 2 capture solvents are in this work studied with the help of molecular modeling. These two equilibrium constants are very important in understanding the thermodynamics of any solvent for post combustion carbon capture. Temperature effects on these two equilibrium constants are also studied for pKa of a data set of 10 amines and 10 amino acids. Temperature dependency of carbamate stability constants of MEA and DEA along with experimental data is also presented.
Comparison of different amine solvents for the absorption of co2
Chemical engineering transactions, 2017
For the capture of CO2 the most promising method is chemical absorption in aqueous amine solutions. The most common solvent recycled in the absorber-stripper system is aqueous monoethanolamine (MEA). However other amines such as diethanolamine (DEA) and methyldiethanolamine (MDEA) are also considered as potential suitable solvents. The reduction by 85 % of the CO2 emission of a coal fired power plant is studied by simulation with a professional flow-sheet simulator. The simulation is done in two steps: first in open loop without recycling the lean solvent and wash water, then in closed loop. The influence of the most important operational parameters is studied. The optimal values where the desorption energy is minimal are determined for the temperature, flow rate and composition (CO2 and amine content) of the cold lean solvent, for the stripper: top pressure, location of the feed stage(s). The heat duties of all heat exchangers are also compared for the three different solvents.
Analysis of Process Configurations for CO 2 Capture by Precipitating Amino Acid Solvents
Industrial & Engineering Chemistry Research, 2014
Precipitating amino acid solvents are an alternative to conventional amine scrubbing for CO 2 capture from flue gas. Process operation with these solvents leads to the formation of precipitates during absorption that need to be re-dissolved prior to desorption of CO 2 . The process configuration is crucial for the successful application of these solvents. Different process configurations have been analyzed in this work, including a full analysis of the baseline operating conditions (based on potassium taurate), the addition of lean vapor compression, multiple absorber feeds, and the use of different amino acids as alternative solvents to the baseline based on potassium taurate. The analysis is carried out with an equilibrium model of the process that approximates the thermodynamics of the solvents considered. The results show that the precipitating amino acid solvents can reduce the reboiler duty needed to regenerate the solvent with respect to a conventional MEA process. However, this reduction is accompanied by an expenditure in lower grade energy needed to dissolve the precipitates. To successfully implement these processes into power plants, an internal recycle of the rich stream is necessary. This configuration, known as DECAB Plus, can lower the overall energy use of the capture process, which includes the energy needed to regenerate the solvent, the energy needed to dissolve the precipitates, and the energy needed to compress the CO 2 to 110 bar. With respect to the energy efficiency, the DECAB Plus with lean vapor compression configuration is the best configuration based on potassium taurate, which reduces the reboiler duty for regeneration by 45% with respect to conventional MEA. Retrofitting this process into a coal fired power plant will result in overall energy savings of 15% with respect to the conventional MEA process, including compression of the CO 2 stream to 110 bar. Potassium alanate was found to reduce the energy use with respect to potassium taurate under similar process configurations. Therefore, the investigation of potassium alanate in a DECAB Plus configuration is highly recommended, since it can reduce the energy requirements of the best process configuration based on potassium taurate.
2016
Fossil fuel burning and industrial gaseous emissions are releasing CO 2 into the atmosphere which is responsible for at least 55 % of global warming today. Pakistan is one of the most severely hit countries by global climate change and the consequences are evident from the fast receding glaciers, floods, droughts and heat waves. Carbon sequestration technology consists of various methods employed to remove CO 2 from the atmosphere. This paper presents the prototype design of amine-based CO 2 capture technology. It uses two amine solvents: Monoethanolamine (MEA) and diethanolamine(DEA) in varying concentrations to test the efficiency of the system (solvent and scrubber). It was discovered that MEA solution at 30% concentration yielded the highest efficiency. The scrubbing reaction is exothermic. Corrosion of the scrubber vessel was identified as a problem in applying this method of sequestration.
A Study on the Potential of Amino Acid Salt as a Solvent for Acid Gas Removal
2009
The presence of acid gas impurities has been one of the major problems in natural gas processing, utilization and transportation. Absorption using alkanolamine as reactive solvent is one of the widely used process to remove these impurities. Very recently, it has been observed by various researchers that alkanolamines could be potentially replaced with amino acids salt as alternative solvent for carbon dioxide (CO2) absorption because of its molecular similarity. In this study, the potential of sodium glycinate, one of amino acid salt, as absorbent for CO2 absorption is investigated. Some critical fundamental properties of aqueous sodium glycinate is measured for various concentrations (1, 5, 10, 15, 20, 30 wt. %) at various temperature. Density, kinematic viscosity, refractive index, heat capacity, acidity, conductivity, surface tension and contact angle with stainless steel surface of aqueous sodium glycinate are measured and reported. Absorption test to measure the solubility of ...
Amino-acid salts for CO2 capture from flue gases
Amino-acid salt solutions provide an interesting alternative to amine based solutions for CO 2 capture from flue gases. Their specific properties make them suitable for application in membrane gas absorption units, allowing compact equipment design and potentially leading to reductions in investment costs. A further advantage can be achieved by the interesting feature of several amino-acid salts that solid precipitates are produced as the CO 2 loading exceeds a certain value. Due to this phenomenon, the equilibrium CO 2 pressure remains constant when the CO 2-loading of the solvent further increases, so that the driving force for absorption can be maintained at a high level even at high loadings. This significantly improves the absorber performance. Furthermore, the high loadings lead to reduced energy consumption during regeneration. The use of precipitating solvents requires some adaptations of the equipment design: the absorber should be able to handle slurries, and the adapted temperature profile during desorption requires the heat exchanger to be partly integrated into the stripper column. Results of a preliminary economic evaluation are presented. It is shown that the proposed technology has the potential to substantially decrease the investment costs and the energy consumption of the capture process. The excellent perspectives have resulted in further fundamental research to provide a firm basis for a novel capture process based on precipitating solvents.
New Process Concepts for CO2 Capture based on Precipitating Amino Acids
Energy Procedia, 2013
This work summarises the results of the design of novel separation processes for CO 2 removal from flue gas based on precipitating amino acid solvents. The processes here described (DECAB, DECAB Plus and pH-swing) use a combination of enhanced CO 2 absorption ( ) and / or enhanced CO 2 desorption (based on pH-shift), which contribute substantially to the reduction of regeneration energy. An evaluation of these processes has been developed based on literature data, thermodynamic principles and experimental data. As solvent example, the potassium salt of taurine was selected. The results show that these processes are environmentally friendly (no emissions to the air, lower ecotoxicity) and have lower energy consumption than conventional MEA. The DECAB Plus process has been identified as the option with lower energy consumption (66% of conventional MEA-ie ca 2.4 GJ/t CO 2 ). This study has established the potential of precipitating amino acids as an energy effective alternative to alkanol amines. The future work will focus on determining the cost of CO 2 avoidance and investigating other solvents that will further lead to benefits over conventional processes.
Sustainability
The operational and economic constraints suffered by amine solvents for CO2 removal have motivated the research on an alternative solvent with better performance and cost-effectiveness. Amino acid salt (AAS) has been identified as an interesting green solvent, an alternative to commercial amine solvents. The present work evaluated the physicochemical and CO2-solubility properties of potassium L-cysteine (K-CYS), a naturally occurring amino-acid-based solvent for CO2 removal from natural gas. Its physicochemical properties, including density, viscosity, and refractive index, were measured at different temperatures ranging between 298.15 and 333.15 K and a concentration range of 5 to 30 wt.%. Based on the experiment, all properties were found to decrease with increasing temperature and increase with increasing concentration. The experiments also demonstrated a significant reduction of CO2 loading from 2.4190 to 1.1802 mol of CO2/mol of K-CYS with increasing solvent concentration from ...