Abstract
Abstract The emission of large amounts of CO2 into the atmosphere is believed to be a major reason behind climate change, which has led to increased demand for CO2 capture. Postcombustion CO2 capture with chemical solvent is considered one of the most important technologies in order to reduce CO2 emission. Amino acid salt solutions have attracted special attention in recent years due to their excellent physicochemical properties, e.g., low volatility, less toxicity, and high oxidative stability, as well as capture performance comparable with conventional amines. In this study, physicochemical properties of 20 amino acids are reported and their CO2 absorption performance discussed. The topics covered in this review include the most relevant properties of amino acids including CO2 loading capacity, cyclic capacity, equilibrium constant, density, viscosity, dissociation constant, CO2 solubility, CO2 diffusivity, reaction kinetic between CO2 and amino acid salts, reaction rate constant, surface tension, heat of CO2 absorption, precipitation, toxicity, solvent degradation, and corrosion rate. This review provides the most recent information available in the literature on the potential of using amino acid salts as a solvent for CO2 capture which can help improve the performance of the CO2 capture process from flue gas streams.
Highlights
The burning of fossil fuels releases a huge amount of greenhouse gases (GHGs) into the atmosphere, which lead to higher temperatures and cause climate change issues (Hu et al 2016)
According to the results reported in the literature, the diffusivity of CO2 in amino acid salt solutions increases as the temperature increases and decreases when concentration increases
The results of this section can be summarized as follows: – The CO2 absorption rate increases as temperature and concentration increase. – Smaller distances between amino and carboxyl groups and bulkier substituted groups lead to slower absorption rate and faster desorption rate. – The sterically hindered amino acid salts show a slow absorption rate and fast desorption rate due to the bulkier substituent group. – The carbonyl oxygen in di-amino acid structure results in a faster desorption rate and slower absorption rate. – K-Sar, K-Lys, and K-Pro have fast reactivity with CO2. – K-Asp, K-Tau, K-Ser, K-Arg, K-Cys, and K-Glu showed faster desorption rate than MEA
Summary
The burning of fossil fuels releases a huge amount of greenhouse gases (GHGs) into the atmosphere, which lead to higher temperatures and cause climate change issues (Hu et al 2016). Favorable properties of amino acid salts make them attractive alternatives to alkanolamine solutions for CO2 absorption from flue gases In this regard, many researchers have investigated amino acid salts as a candidate for CO2 capture and reported their physicochemical properties. Many researchers have investigated amino acid salts as a candidate for CO2 capture and reported their physicochemical properties Since these studies did not compare performance of amino acid salts to each other, it is difficult to find the best one among 20 different types of amino acids. The various properties of 20 amino acid salts are discussed in detail in terms of CO2 loading capacity, cyclic capacity, equilibrium constant, density, viscosity, dissociation constant (pKa), CO2 physical solubility, CO2 diffusivity, kinetic study, surface tension, heat of CO2 absorption, precipitation, toxicity, solvent degradation, and corrosion rate. Absorption performance of amino acid salts is compared to MEA as the most important conventional amine
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