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Fundamental Studies on NH3 Capture Using Ionic Liquids

Author: LiGuiHua
Tutor: LiJianWei
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Ionic liquids Vapor-liquid equilibrium Thermodynamic Properties Ammonia exhaust
CLC: TQ028.15
Type: Master's thesis
Year: 2011
Downloads: 75
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Abstract


Existing NH3 absorption technology limitations and ionic liquid is almost non-volatile solubility and excellent features, this paper proposes the use of ionic liquids fixed conversion NH3, for resource utilization from industrial emissions to chemical products. Systematic study of phase relations of conventional imidazolium ionic liquid and NH3, to provide a theoretical basis for the ionic liquid fixed conversion NH3 and provision of physical and thermodynamic data for the ionic liquid database. (1) build a device of the vapor-liquid equilibrium. Static method and were measured in the pressure range of 0 ~ 1MPa 293.15K 298.15K 313.15K 323.15K 333.15K temperature, NH3 ionic liquid [the CnMIM] [BF4] (n = 2,4,6 , 8,) the solubility of the. The results show that the solubility of ammonia in the ionic liquids studied increases with increasing pressure, with the decrease of temperature rise with the increase in the ionic liquid cationic alkyl carbon chain length is increased. (2) the establishment of the ammonia dissolved in the ionic liquid thermodynamic model to calculate the dissolution process ΔsolG, ΔsolH AsolS A solCp thermodynamic properties. (3) the water content of ammonia in ionic liquid [C8MIM] [BF4] solubility influence. Measuring temperature of 313.15K, and the pressure is between 0 ~ 1MPa, NH3 in the water content of 0.93%, 21.28%, 28.67% [C8MIM] [BF4] solubility. dissolving ability weakened. This is because the ammonia in C8MIM] [BF4] The dissolution mainly physical absorption process, in this process, ammonia needs occupy C8MIM] [BF4] in the hole position in the structure. content increases, [C8MIM] [BF4] weakened the absorption capacity of the ammonia. (4) can be designed according to the NH3 alkaline ionic liquid synthesized two acidic ionic liquids: [HSO3MIM] [BF4] and [HSO3MIM] [HSO4]. In which the behavior of dissolved ammonia. The results show that the ionic liquid of ammonia and two acidic chemical reaction, generating intermediate 1 - methyl -3 - butylimidazole sulfonates and the corresponding ammonium salts. Normal temperature and pressure ammonia [HSO3MIM] [BF4] [HSO3MIM] to [HSO4 solubility in both acidic ionic liquid were 0.8578 and 0.9024.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Separation process > Single- phase system the separation of gas mixtures > Adsorption and desorption
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