Simultaneous optimization of binary phase equilibrium and thermodynamic data for organic systems

1987 ◽  
Vol 26 (9) ◽  
pp. 1774-1781 ◽  
Author(s):  
Paul K. Talley ◽  
Christopher W. Bale ◽  
Arthur D. Pelton
Keyword(s):  
Phase Equilibrium ◽  
Thermodynamic Data ◽  
Simultaneous Optimization ◽  
Binary Phase ◽  
Organic Systems

Research on Binary Phase Equilibrium for 1-Methylnaphthalene + CO2

2020 ◽  
Vol 65 (5) ◽  
pp. 2813-2818
Author(s):  
Shiyuan Wang ◽  
Songhui Wang ◽  
Bin Wang ◽  
Zhao Jiang ◽  
Tao Fang
Keyword(s):  
Phase Equilibrium ◽  
Binary Phase

Producing PVP Nanofibers by Electrospinning in N2

2012 ◽  
Vol 560-561 ◽  
pp. 701-708 ◽  
Author(s):  
Lu Li ◽  
Jie Xu ◽  
Tao Fang ◽  
Jin Geng ◽  
Detlef Freitag ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Phase Equilibrium ◽  
Phase Separation ◽  
Phase Behavior ◽  
Polymer Solution ◽  
Aspen Plus ◽  
Good Choice ◽  
The Other ◽  
Binary Phase ◽  
Novel Method

Electrospinning combined with nonsolvent-induced phase separation is a simple and novel method to produce porous nanofibers. In the study, Poly (vinylpyrrolidone) (PVP) nanofibers were fabricated using an electrospinning approach complemented by compressed nitrogen (N). N2 was used as the nonsolvent of choice. Besides, the tun2ning of N2 pressure and temperature can impact the nanofibers’ morphologies by altering phase behavior and mass transfer. Also, the other parameters affecting electrospinning of polymer solution were discussed. The results were demonstrated by extending the technique to PVP/dichloromethane (DCM) and PVP/ethanol (EtOH) systems. And the binary phase equilibrium of solvents (dichloromethane or ethanol) and N simulated by ASPEN PLUS 2006 demonstrates that N is not a 2good choice for producing hollow or po2rous polymer nanofibers.

scholarly journals A new atmospheric aerosol phase equilibrium model (UHAERO): organic systems

2007 ◽  
Vol 7 (17) ◽  
pp. 4675-4698 ◽  
Author(s):  
N. R. Amundson ◽  
A. Caboussat ◽  
J. W. He ◽  
A. V. Martynenko ◽  
C. Landry ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Atmospheric Aerosols ◽  
Water Systems ◽  
Organic Species ◽  
Atmospheric Particle ◽  
Organic Systems ◽  
Activity Coefficient Model ◽  
Liquid And Solid Phases

Abstract. In atmospheric aerosols, water and volatile inorganic and organic species are distributed between the gas and aerosol phases in accordance with thermodynamic equilibrium. Within an atmospheric particle, liquid and solid phases can exist at equilibrium. Models exist for computation of phase equilibria for inorganic/water mixtures typical of atmospheric aerosols; when organic species are present, the phase equilibrium problem is complicated by organic/water interactions as well as the potentially large number of organic species. We present here an extension of the UHAERO inorganic thermodynamic model (Amundson et al., 2006c) to organic/water systems. Phase diagrams for a number of model organic/water systems characteristic of both primary and secondary organic aerosols are computed. Also calculated are inorganic/organic/water phase diagrams that show the effect of organics on inorganic deliquescence behavior. The effect of the choice of activity coefficient model for organics on the computed phase equilibria is explored.

Elastomer Swelling in Mixed Solvents

1999 ◽  
Vol 72 (1) ◽  
pp. 74-90 ◽  
Author(s):  
P. A. Westbrook ◽  
R. N. French
Keyword(s):  
Phase Equilibrium ◽  
Thermodynamic Data ◽  
Chemical Structure ◽  
Mixed Solvents ◽  
Equilibrium Concept ◽  
Solvent Phase ◽  
Empirical Procedure ◽  
Ideal Solutions ◽  
Linear And Nonlinear ◽  
Exposure Methods

Abstract A critical performance factor for elastomers in chemical service is absorption of solvents. Since swelling data are often limited to single component exposure, methods to estimate elastomer compatibility with mixed solvents have received considerable theoretical attention. The evolution of these methods is reviewed. Then, an alternative empirical procedure is proposed which is based upon a generalization of Flory's network-solvent phase equilibrium concept. The resulting linear and nonlinear partition coefficient models are used to predict swelling behavior of various elastomers in nearly ideal hydrocarbon solutions as well as other non-ideal solutions. Advantages of the current methods are that they utilize readily available swelling data of the elastomers in pure solvents and also thermodynamic data of the solution of interest. Adjustable parameters are required only when strong associative swelling agents are present. Finally, information regarding the chemical structure of the elastomer is not required.

scholarly journals The Scaling of Blood Pressure and Volume

Foundations ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 145-154
Author(s):  
José Guilherme Chaui-Berlinck ◽  
José Eduardo Pereira Wilken Bicudo
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cardiovascular System ◽  
Entropy Production ◽  
System Optimization ◽  
Simultaneous Optimization ◽  
Scaling Effects ◽  
Broad Perspective ◽  
Evolving Systems ◽  
Organic Systems

The cardiovascular system is an apparatus of mass convection, and changes in organismic size impart changes in variables of this system, namely scaling effects. Blood flow depends on pressure and conductance, and the maintenance of flow results in entropy production, that is, loss of available work. In terms of scaling, it is well known that blood pressure is kept constant while blood volume varies linearly with body mass. Yet, such expected rules have never been proven. The present study shows that these scaling rules derive from the simultaneous optimization of blood flow and entropy production in circulation and how these impact the transition from ecto- to endotermy. Thus, for the first time in almost a century of data collection, these observed relationships are explained from a theoretical standpoint. The demonstration presented herein is a building block to form a solid basis for the other scaling rules of the cardiovascular system as well as of other organic systems. The approach is of wide interest in any area where generalized flow is analyzed in terms of system optimization, giving a broad perspective on change in either engineered or naturally evolving systems.

scholarly journals A new atmospheric aerosol phase equilibrium model (UHAERO): organic systems

2007 ◽  
Vol 7 (3) ◽  
pp. 8709-8754
Author(s):  
N. R. Amundson ◽  
A. Caboussat ◽  
J. W. He ◽  
A. V. Martynenko ◽  
C. Landry ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Atmospheric Aerosols ◽  
Water Systems ◽  
Organic Species ◽  
Atmospheric Particle ◽  
Organic Systems ◽  
Activity Coefficient Model ◽  
Liquid And Solid Phases

Abstract. In atmospheric aerosols, water and volatile inorganic and organic species are distributed between the gas and aerosol phases in accordance with thermodynamic equilibrium. Within an atmospheric particle, liquid and solid phases can exist at equilibrium. Models exist for computation of phase equilibria for inorganic/water mixtures typical of atmospheric aerosols; when organic species are present, the phase equilibrium problem is complicated by organic/water interactions as well as the potentially large number of organic species. We present here an extension of the UHAERO inorganic thermodynamic model (Amundson et al., 2006c) to organic/water systems. Phase diagrams for a number of model organic/water systems characteristic of both primary and secondary organic aerosols are computed. Also calculated are inorganic/organic/water phase diagrams that show the effect of organics on inorganic deliquescence behavior. The effect of the choice of activity coefficient model for organics on the computed phase equilibria is explored.

Sign in / Sign up

Export Citation Format

Share Document