The Synthesis Of Novel Functional Ionic Liquids And Their Application In The Capture Of Acid Gases

Acid gases originated from fossil fuel combustion,such as CO₂,NO and SO₂,have drawn global worldwide attention because they have seriously harm to global environment and human health,and hinder the economic development recently.For acid gases treatment problems,gas capture method is a better chemical method and has good developing prospects.We often regard ionic liquids?ILs?as good absorbents for the capture of acid gases,and mainly reason is that ionic liquid has a series of excellent properties,such as low vapor pressure,high solubility,wide liquid range,and adjustable structure.We can effectively control acid gases emissions through using the capture of ionic liquids.The main contents of this paper are as follows:For CO₂ capture,the anion functionalized strategy has been proposed for the synthesis of carboxylic anion ionic liquids?[P66614][CCl3COO]?.A series of basic tunable ionic liquids were prepared and applied in NO absorption.A highly efficient and reversible NO absorption was achieved through tuning the electrical property of substituent next to carboxylic anion.In this work,the NO working capacity was up to 3.00 mol per mol IL at 30 ?,1 bar,and the desorption residue was only 0.50 mol per mol IL at 80 ?,under bubbling N2.Moreover,the NO capture was highly reversible.Through a combination of absorption experiments,DFT calculations,TGA analysis,FT-IR and NMR spectroscopic investigations,the results indicated that such high reversible absorption capacity was originated from multiple-site interaction between O atoms of anion and NO via the formation of O₂N2-O-C-O-N2O₂.A series of experimental methods were used to study the absorption of CO₂ and SO₂ by hydroxy benzoate based ionic liquids.We synthesized hydroxyl benzoic acid-based single anion and double anions.Through data analysis,absorption curve analysis and DFT calculations,the results indicated that the hydroxy benzoic acid ionic liquids had good absorption performance and double anions absorption capacity are greater than single anion absorption capacity,which reflected efficient capture of double anions.This method developed by this work provides a new way for efficient capture CO₂ and SO₂.