Prediction of the solubility of H2S in NaCl aqueous solution: an equation of state approach

1996 ◽  
Vol 130 (1-2) ◽  
pp. 15-20 ◽  
Author(s):  
Zhenhao Duan ◽  
Nancy Møller ◽  
John H. Weare
Keyword(s):  
Aqueous Solution ◽  
Equation Of State

Modeling the solubility of carbon dioxide in the MDEA + AEEA aqueous solution using the SAFT-HR equation of state and extended UNIQUAC model

2021 ◽  
pp. 1-17
Author(s):  
Azam Najafloo ◽  
Hossein Sakhaeinia
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Liquid Phase ◽  
Equation Of State ◽  
Chemical Equilibrium ◽  
Extended Uniquac ◽  
Extended Uniquac Model ◽  
Point Calculation ◽  
Interior Loop ◽  
Fugacity Coefficients

In this study, a thermodynamic model has been used to determine the solubility of carbon dioxide in an aqueous solution which is the combination of methyldiethanolamine (MDEA) and aminoethylethanolamine (AEEA). The physical equilibriums have been considered between the liquid and vapor phases and chemical equilibrium in the liquid phase. The SAFT-HR equation of state has been used to specify the fugacity coefficients of the components in the vapor phase. The liquid phase is considered as an electrolyte solution besides; the extended UNIQUAC has been applied to figure out the activity coefficients. The bubble point calculation has been used in this research. This method includes two main loops. Calculations related to chemical equilibrium are performed in the interior loop and the ones associated with phase equilibrium are done in the exterior loop. The solubility of carbon dioxide has been predicted by the optimized parameters of the model in the temperature range of 308.2–368.2 K. It has been calculated that the absolute average relative deviations of the model are 16.65, 19.33, 28.91 and 19.99 in the calculation of partial pressure of carbon dioxide in various loadings at the temperatures of 308.2, 328.2, 343.2 and 368.2 K.

Adsorption of TX100 and TX165 at the aqueous solution-air interface: free enthalpy of adsorption and equation of state

2000 ◽  
Vol 278 (4) ◽  
pp. 321-328 ◽  
Author(s):  
A. El Ghzaoui ◽  
E. Fabr�gue ◽  
G. Cassanas ◽  
J. M. Fulconis ◽  
J. Delagrange
Keyword(s):  
Aqueous Solution ◽  
Equation Of State ◽  
Free Enthalpy ◽  
Enthalpy Of Adsorption ◽  
Air Interface

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

Sign in / Sign up

Export Citation Format

Share Document