Dissertation > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization

The Study of CO2 Absorption in Mixed Aqueous Solution of MDEA and Amino Acid Ionic Liquid

Author FangChengGang
Tutor GengZuo
School Nanjing University
Course Applied Chemistry
Keywords N-methyl- diethanolamine (MDEA) Tetramethylammonium glycine ionic liquids ([N1111] [Gly]) Carbon dioxide Falling film absorption The double cropping Ammonium amino acid ionic liquids
CLC X701
Type Master's thesis
Year 2011
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Excessive emissions of carbon dioxide, caused a serious negative impact on the global climate and environment. CO2 emission control is directly related to industrial production, climate, human health, and energy use, decarbonization technology is particularly important and urgent. Industrial use more organic amine absorption method there are many disadvantages, such as MEA fast CO2 absorption rate, corrosion and high energy consumption, renewable, MDEA higher CO2 absorption capacity, but slower absorption rate. The the special excellent performance of the ionic liquid so that it can be used as an environmentally friendly decarburization absorbent, wherein the amino acid ionic liquids have a higher absorption rate of CO2. In order to improve the application performance of the organic amine C02 absorbents to study novel decarburization absorbent, paper synthesized tetramethylammonium glycine ([N1111] [Gly]) ionic liquid, and formulated into three different concentrations and the aqueous MDEA solution performance, as well as the falling film in the process of mass transfer performance. First double boiler absorbing device with constant volumetric method to study the performance of mixed CO2 absorbent, through analysis and comparison confirmed the CO2 partial pressure and increases the ionic liquid [N1111] [Gly] concentration can make mixed absorbent for CO2 absorption capacity per unit volume of to be improved, balanced molar absorption rate is also increased as the CO2 partial pressure to improve, but its contents with the concentration of [N1111] [Gly]. Design and build a set of countercurrent falling film absorption device, and the device measured the performance of mixed absorbent pure CO2 and CO2-N2 gas mixture (20% CO2 80% N2) falling film absorption was found [N1111] [Gly] concentration, the flow conditions of the gas and mixed absorbent for absorption of the mass transfer coefficient. Increase were increased and mass absorption effect falling film absorption of pure CO2 gas, the flow of gas or mixture of absorbent, absorbent [N1111] [Gly] ionic liquid concentration increases the absorption effect to improve; For CO2- falling film absorption of N2 gas mixture, the gas flow rate increase to improve mass transfer absorption effect when the gas flow rate is greater than a certain flow, gas flow rate continues to increase so they will absorb the effect of reducing the mixed the absorbers flow and absorbent [ N1 (?)] [Gly] concentration increase a positive impact on both the mass transfer absorption effect. Summing up all influencing factors, a number of quasi-relational absorption coefficient obtained by dimensional analysis method: The average relative deviation between the pure CO2: Sh = 5.637 × a 10-11ReL1.225ReG0.695ScL2.085 on the calculated and experimental values ??for the 8.46%. C02-N2 gas mixture: Sh = 10.03% average relative deviation between 0.0247ReL0.495ReG0.371ScL0.065 on calculated and experimental values. Found by experimental comparison with the 30% MDEA aqueous solution falling film absorption [N1111] [Gly] absorbent effect of falling film absorption of CO2 significantly improve confirmed quaternary ammonium amino acid ionic liquid improved traditional MDEA absorbers potential The application value. Also designed and synthesized a number of new the double cropping ammonium type amino acid ionic liquid, and the products were 1HNMR characterization. Select a product tetramethyl butyl ethyl diammonium diglycine (C2 (N114) 2Gly2) formulated as an aqueous solution of different concentrations for CO2 absorption experiments. Experimental results show that an impact on the absorption rate for the different concentrations of the double cropping ammonium type amino acid ionic liquid solution, the concentration and the absorbent viscosity, increasing the concentration of the ionic liquid in the absorbent can increase the absorption rate, but the ionic liquid concentration Assembly absorbers viscosity increases, but reduces the absorption rate. This work will be used in the hybrid aqueous solution of amino acid ionic liquid-MDEA industrial real close to falling film absorption process, the experimental results obtained for the hybrid aqueous solution of amino acid ionic liquid-MDEA CO2 absorption further exploration and research for future industrial The application of simulation experiments to lay some foundation.

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