Synthesis Of Functional Ionic Liquid And Study On The Absorption Of Blast Furnace Gas

In today’s world, distribution of carbon dioxide emission is not even. CO2emissions in China have surpassed the United States. And China has been the highestCO2emissions country in the wold. According to the instruction from the countryeconomic conference, energy conservation and emissions reduction are considered asan examining index of social economic development in China. Because steel makingis an industry with high energy consumption and heavy emissions of greenhousegases, it must bear significant task in energy conservation and emission reduction.Based on background of blast furnace gas, a series of synthesis of functionalized ionicliquids was done in this work. To improve the calorific value of the blast furnace gas,reduce greenhouse gas emissions, and lower the energy loss carried by CO2gas in thesubsequent process of circulation, the related basic experiments of CO2capture wereconducted.First, the Tetra-alkyl ammonium hydroxide solution and amino acids wascombined in a certain proportion. Using one step synthesis method, crude product canbe obtained directly. And then, the product can be gained by processes of distillationof reduce pressure, extraction of products washing. Still, the production rates ofsyntheses are calculated. The melting points, the crystallization temperatures, thedecomposition temperatures, the densities as well as the viscosities of ionic liquidssynthesized in this work were measured and determined. The results show that, aboveparameters are lower than other ionic liquids, which means the synthetic liquids aresuitable as CO2capture agents. Moreover, a rule of η[N1111][β-Ala]> η[N1111][Gly];η[N4444][β-Ala]>η[N4444][Gly] is found from the results. Using the FTS-135Fouriertransform infrared spectroscopy and nuclear magnetic resonance1H NMR, thestructures of the ionic liquids were characterized, and it is confirmed that the syntheticproducts are the expected.According to the characteristics of the ionic liquid absorb CO2,4kinds oftetra-alkyl quaternary amine acids as capture agent to capture CO2gas separationexperiment research was carried out, and the absorption reaction mechanism wasanalyzed. The series of experiments condition is high purity CO2gas, gas flow rate is0.5L/min, absorption temperature is25℃. The above four kinds of ionic liquids areconfigured to capture agent of40%aqueous solution. The CO2absorption rate,absorption and absorbing load were compared to select the best capture agent. Theresults show that the [N1111][Gly]’s absorption rate and the absorption load are the bestamong the four amino acid methyl quaternary ammonium ionic liquids. The effect ofionic liquid concentration (c) and reaction temperature (T) to [N1111][Gly] areresearched. The results show that when the ionic liquid’s mass fraction at40%, itsabsorption efficiency can reach to85.2%, and the experiment temperature between 298K to323K has little effect on CO2capture.Tetra-methyl quaternary amine lysine ionic liquid which mass fraction of40%and TEPA ionic liquid which mass fraction of50%absorb CO and N2mixed gas(mole ratio of3:7) made by gas furnace was studied. The results show that theabsorption is zero.Simulation of blast furnace gas is made by CO2and N2(mole ratio of1:4).Absorption experiments were also proceeded by these two aqueous solutions to thesimulation of blast furnace gas. The results indicate that the ionic liquids do notabsorb CO or N2except CO2. But the time of absorb saturated is lengthen25min.Therefore, the two kinds of ionic liquid have the characteristics of selectiveabsorption.By the way of complex formulation, the TEPA ionic liquid and MDEA、fouramino acid methyl quaternary ammonium ionic liquids [N1111][Gly] and MDEA areused to explore the absorption of CO2. The results show that it is better on the aspectof absorption rate、uptake、saturation time than that of MDEA. The absorptionincreases from9%to18%and from15.01%to29.4%separately compare withMDEA. All above indicates that the complex formulation of ionic liquid is aneffective way to increase the separating effect of CO2.