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Equilibrium Measurement for Water Working Medium Systems Containing Imidazolium Ionic Liquids

Author: FanLiHua
Tutor: ZhengDanXing
School: Beijing University of Chemical Technology
Course: Chemical Engineering
Keywords: Absorption cycle working fluid The chlorinated 1,3 - dimethylimidazole 1,3 - dimethyl tetrafluoroborate Lithium bromide Saturated vapor pressure
CLC: O642.42
Type: Master's thesis
Year: 2010
Downloads: 130
Quote: 0
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Abstract


The absorption cycle to the substances no damage to the ozone layer as the working fluid directly to low-grade heat source to drive, while the use of solar and other renewable energy, reduce grid peak pressure is an important energy saving and environmental protection technology. The working fluid is the most basic factors of absorption cycle, both the qualitative improvement of existing work, or the development of new working fluid, the basis of its thermodynamic properties are studied. Ionic liquid has a \In this paper, a new working fluid as water and ionic liquid research direction to study the nature of the vapor pressure of the mixture refrigerant system. Determined according to the absorption cycle working fluid refrigerant and absorber mutual constraint conditions and the nature of ionic liquids based screening two ionic liquids: Chloride 1,3 - dimethylimidazole ([DMIm] Cl) and 1 3 - dimethyl imidazolium tetrafluoroborate ([DMIm] BF4) as the object of study, the laboratory synthesis. N-methyl imidazole and methyl chloride as raw material, the use of gas-liquid synthetic products are added into the reaction [DMIm] Cl; to intermediates [DMIm] Cl and sodium tetrafluoroborate as raw material, using a two-step synthesis [DMIm ] BF4, and refined products, structural characterization and purity determination. Design and build a set of dynamic measurement experimental apparatus of the vapor pressure of the solution, measured for pure water and the mass fraction of the aqueous solution of sodium chloride 0.25 vapor pressure data, experimental data and literature data mean relative deviation was 0.41% and 0.57% , proved the reliability of the device. The measured H2O (1) / [DMIm] BF4 was (2) System in w2 of 0.90,0.85,0.75 and 0.65, T 310 K ~ 410 K when the saturated vapor pressure data. H2O / [DMIm association model of the] BF4 system vapor pressure and temperature, concentration, the average relative deviation of model calculations and experimental values ??were 1.06% and 1.15% respectively Antoine equation and NRTL equations. A saturated vapor pressure of the system to show a negative deviation of Raoult's law, and the higher the content of the ionic liquid, the greater the deviation from the Raoult's law, to prove that the system has potential as absorption cycle working fluid. 0.69,0.60,0.50,0.40 and 0.30 the measured H2O (1) / LiBr DMIm] Cl (2) ternary system in w2, T 300 K ~ 440 K, the saturated vapor pressure data, including: LiBr: [ DMIm] Cl = 3:1 (mass ratio). The Antoine equation established H2O/LiBr [DMIm] Cl system vapor pressure and temperature, the concentration of the associated model, the model calculated and experimental values ??of the average relative deviation of 1.18%. The ionic liquid was added in the system, H2O/LiBr [DMIm] Cl, primary lithium bromide aqueous solubility is increased, and so that the vapor pressure of the original solution to be reduced. , H2O/LiBr [DMIm] Cl ternary system having more excellent thermodynamic properties as absorption cycle working fluid.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical thermodynamics, thermochemistry, thermodynamic equilibrium > Thermodynamic equilibrium > Phase Equilibria
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