Preparation Of New Amino Ionic Liquids And Their Performance Text

With the explosive growth of the global population and the significant increase of people’s demand for life,the demand for resources is gradually increasing,which leads to the development and use of coal,oil and natural gas.The combustion of these energy sources releases a large amount of NO,such as NO,CH₄,CO₂and SO₂cause the greenhouse effect and lead to global warming,of which CO₂has the worstimpact.As a green and environmentally friendly organic solvent,ionic liquid has very good solubility and selective separation of CO₂,and has gradually become a hot research object.In this paper,three new types of amino acid functionalized ionic liquids were synthesized and characterized.The effects of amino acid ionic liquids on CO₂absorption performance under different temperature,pressure and mass fraction conditions were explored,and their cyclic regeneration stability was discussed.The specific work is as follows:Three amino acid ionic liquids were synthesized by a two-step method:1-butyl-2,3-dimethylimidazole lysine salt[BDi MIm][Lys],1-aminoethyl-3-methylimidazolelysineAminoacid[C₂NH₂MIm][Lys],1-aminoethyl-3-methylimidazolium alanine salt[C₂NH₂MIm][Ala].The three synthetic amino acid ionic liquids were analyzed and characterized by infrared spectroscopy to confirm that the synthesized samples were the target products.The results of thermogravimetric analysis showed that the three ionic liquids had good thermal stability.By investigating the effects of the synthesized three amino acid ionic liquids on the performance of CO₂absorption under different temperatures,pressures and mass fractions,it can be seen that the absorption capacity and absorption rate of CO₂in the three ionic liquids both increase with the continuous pressure.However,as the temperature and mass fraction increase,the amount and rate of CO₂absorption first increase and then decrease.When the temperature is30℃and the pressure is 1 MPa,the absorption of CO₂by the three amino acid ionic liquids with a mass fraction of 20%reaches the maximum,which are 1.23 mol/mol,1.72 mol/mol and 1.30 mol/mol,respectively.At the same time,three kinds of amino acid ionic liquid1-butyl-2,3-dimethylimidazole lysine salt[BDi MIm][Lys],1-aminoethyl-3-methylimidazolelysine[C₂NH₂MIm][Lys],1-aminoethyl-3-methylimidazolium alanine salt[C₂NH₂MIm][Ala]has good recycling performance,after seven desorption regeneration,its CO₂absorption rate is 89.4%,90.7%,92.3%.