scholarly journals Measurement and Thermodynamic Modeling for CO2 Solubility in the N-(2-Hydroxyethyl) Piperazine + Water System

2021 ◽  
Vol 9 ◽  
Author(s):  
Simeng Li ◽  
Gern Woo Kang ◽  
Jian Chen
Keyword(s):  
Thermodynamic Model ◽  
Water System ◽  
Mutual Solubility ◽  
Physical Parameters ◽  
Heat Of Reaction ◽  
Co2 Solubility ◽  
High Boiling Point ◽  
Amine System ◽  
Reaction Constants ◽  
Hydroxyethyl Piperazine

Amine scrubbing is the most important technique for capturing CO2. The cyclic diamine N-(2-Hydroxyethyl)-piperazine (HEPZ), a derivative of piperazine, with good mutual solubility in aqueous solution, a low melting point, and a high boiling point, has the potential to replace PZ as an activator added in the mixed amine system to capture CO2. In this study, the solubility of CO2 in aqueous HEPZ solutions was determined for three HEPZ concentrations and four temperatures. The VLE data for HEPZ-H2O were obtained using a gas–liquid double circulation kettle at pressure 30–100 kPa, and the thermodynamic model for the HEPZ-H2O-CO2 system was built in Aspen Plus based on the electrolytic non-random two-liquid (ENRTL) activity model. The physical parameters for HEPZ and the interaction parameters for ENRTL, along with reaction constants of carbamate reactions, were regressed. Using the thermodynamic model, the CO2 cyclic capacity, speciation with loading, and heat of reaction for the CO2 capture system by the aqueous HEPZ solution are predicted and analyzed.

Specific Heat of Tribological Wear Debris Material

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Maria Maciąg
Keyword(s):  
Specific Heat ◽  
Thermodynamic Model ◽  
Wear Debris ◽  
Friction And Wear ◽  
Mass Conservation ◽  
Phenomenological Approach ◽  
Wear Testing ◽  
Physical Parameters ◽  
Friction Process ◽  
Solid Friction

Stationary processes of solid friction, heating and wear are analyzed in this paper on the basis of the first principle of thermodynamics. Analytical dependences between physical parameters of a tribological system have been determined. Densities of extensive quantity fluxes are referred to elementary surface and elementary time, which has permitted to include intensive quantities, especially temperature, in the model presented here. Although the discussion is restricted to the phenomenological approach, conclusions regarding some microscopic properties of the matter in the process of fragmentation are drawn directly from the laws of energy and mass conservation. Differences between specific heat of the starting material cp and of the debris produced cp′ are emphasized. The model of the friction process described by Maciąg, M. (2010, “Thermodynamic Model of the Metallic Friction Process,” ASME J. Tribol., 132(3), pp. 1–7) has been modified and a new method of evaluating cp′ is proposed. Results of standard friction and wear testing are used to describe selected tribological systems in quantitative terms based on the thermodynamic model discussed here (Sadowski, J., and Żurowski, W., 1992, “Thermodynamic Aspects of Metals' Wear-Resistance,” Tribol. Lubr. Eng., 3, pp. 152–159). Very high specific heat of tribological wear debris material is found at the moment of the material's production. To conclude, results of theoretical and experimental analysis are discussed and their interpretation is proposed. Applicability of the system magnitudes C and D to modeling of friction and wear is highlighted.

scholarly journals Modelling of CO2 solubility in phase separation solvent composed of amine/ether/water system for CO2 capture

2019 ◽  
Vol 292 ◽  
pp. 111411 ◽  
Author(s):  
Hiroshi Machida ◽  
Ryuya Ando ◽  
Takehiro Esaki ◽  
Tsuyoshi Yamaguchi ◽  
Koyo Norinaga
Keyword(s):  
Phase Separation ◽  
Co2 Capture ◽  
Water System ◽  
Co2 Solubility

Photochemistry of toluene under high NOx, NH3 and humid conditions in the presence of inorganic seed particles: a smog chamber study for urban haze formation at East Asia

2020 ◽  
Author(s):  
Yong Lim ◽  
Duong Do ◽  
Hyun Jin ◽  
Jiwon Lee ◽  
Jin Young Kim
Keyword(s):  
East Asia ◽  
Ammonium Sulfate ◽  
Aqueous Phase ◽  
Thermodynamic Model ◽  
Large Fraction ◽  
Water System ◽  
Smog Chamber ◽  
High Concentration ◽  
Seed Particles ◽  
Inorganic Species

<p>High–concentration particulate matter (PM) at East Asia threatens human health and potentially alters climate. High levels of SO<sub>2</sub>, NO<sub>x</sub> and NH<sub>3</sub> emissions attribute the formation of inorganics including sulfates, nitrates and ammoniums in PM. Consequently, PM contains a large fraction of these inorganics, and aerosol liquid water (ALW) is considered to promote inorganic PM formation. A thermodynamic model has been used to estimate inorganic concentrations and a pH of PM because PM can be viewed as an ammonium-sulfate-nitrate-water system, which maintains thermodynamic equilibriums between the gas and particle phase and in the aqueous phase within particles. However, gas–particle partitioning of semivolatile inorganic species (i.e., NH<sub>3</sub>–NH<sub>4 </sub><sup>+ </sup>and HNO<sub>3</sub>–NO<sub>3</sub><sup>-</sup>) particularly influenced by organics and aqueous-phase secondary organic aerosol (aqSOA) formation in PM through multiphase chemistry are not well understood.</p><p>We conducted smog chamber experiments for OH-radical initiated reactions of toluene in the presence of ammonium sulfate seed particles under high NO<sub>x</sub>, NH<sub>3</sub> and humid conditions, which were similar to high-concentration haze conditions at Seoul, Korea. Measurements of inorganic concentrations in particles agree well with outputs of thermodynamic model simulations. The nitrate increase in seed particles is most prominent because ALW enhances the uptake of total HNO<sub>3</sub> photochemically formed from NO<sub>x</sub>. We identified methylglyoxal as a precursor for aqSOA formation. It appears that organics attribute ALW formation under deliquescence relative humidity for inorganic salts. We further investigated the response of particle mass concentrations to various NO<sub>x</sub> concentrations, which can be useful for NO<sub>x</sub> controls for PM reduction.</p>

scholarly journals Modified e-LCVM EoS/GE Thermodynamic Model for Carbon Dioxide – MDEA – Water System

2016 ◽  
Vol 148 ◽  
pp. 902-907 ◽  
Author(s):  
Humbul Suleman ◽  
Abdulhalim Shah Maulud ◽  
Zakaria Man
Keyword(s):  
Carbon Dioxide ◽  
Thermodynamic Model ◽  
Water System

Thermodynamic Model for Vapor-Liquid Phase Equilibrium in an Exerted Magnetic Field

2012 ◽  
Vol 550-553 ◽  
pp. 2704-2711
Author(s):  
Hong Bo Tang ◽  
Min Qing Zhang
Keyword(s):  
Magnetic Field ◽  
Phase Equilibrium ◽  
Liquid Phase ◽  
Magnetic Fields ◽  
Thermodynamic Model ◽  
Water System ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
The Magnetic Field ◽  
Vapor Liquid

Many researchers have shown a great deal of interest in the effects that magnetic fields have when applied in chemical reactions, crystallization, magnetic separation of materials, magnetic levitation, materials processing, and wastewater treatment. However, surprisingly little research has been done on the effects of magnetic fields on the vapor-liquid equilibrium and the thermodynamic model for vapor-liquid phase equilibrium. The influence of magnetic fields on vapor-liquid equilibrium of binary heterogeneous azeotrope was investigated with ethanol-water in this paper. It was found that the vapor-liquid equilibrium of an ethanol-water system is influenced by the external magnetic field, but that the azeotropic point of the ethanol-water system is not changed by the magnetic field when the magnetic intensity reaches 0.8 T. Rather, the exerted magnetic field reduces the equilibrium temperature and shortens the distance between T-x curve and T-y curve in T-x-y diagram of the vapor-liquid equilibrium of the ethanol-water system. A thermodynamic model for vapor-liquid phase equilibrium in the exerted magnetic field was derived theoretically, based on the fundamental thermodynamic theory. The results show that the logarithm value of the ratio of the composition of the certain component in a magnetic field to that without the magnetic field is proportional to the magnetic susceptibility of the solution, and to the square of magnetic field intensity. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

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