Thermodynamic Study of Na2Cr2O7(aq) at 25 °C

1999 ◽  
Vol 64 (4) ◽  
pp. 595-599 ◽  
Author(s):  
Christomir Christov ◽  
Snejana Velikova ◽  
Kalina Ivanova ◽  
Stefan Tanev
Keyword(s):  
Thermodynamic Analysis ◽  
Binary Solution ◽  
Osmotic Coefficients ◽  
Interaction Model ◽  
Thermodynamic Characteristics ◽  
Thermodynamic Study ◽  
Isopiestic Method ◽  
Interionic Interaction ◽  
Ion Interaction Model

The isopiestic method was used to determine osmotic coefficients of binary Na2Cr2O7(aq) solutions of concentrations 0.6777-3.8792 mol kg-1 at 25 °C. The concentration of a saturated binary solution Na2Cr2O7(aq) at 25 °C was determined. The Pitzer ion-interaction model has been used for thermodynamic analysis of the results obtained. Optimum values of the binary parameters of interionic interaction have been calculated and important thermodynamic characteristics of Na2Cr2O7·2 H2O determined.

Thermodynamic Study of the CuCl2-MCl2-H2O Systems (M = Mg, Co) at 298.15 K

1996 ◽  
Vol 61 (4) ◽  
pp. 507-511 ◽  
Author(s):  
Christomir Christov
Keyword(s):  
Thermodynamic Functions ◽  
Interaction Model ◽  
Thermodynamic Study ◽  
Interaction Parameters ◽  
Solubility Diagrams ◽  
Solubility Products ◽  
Ion Interaction Model ◽  
Good Agreement

The Pitzer ion-interaction model was used for a simulation of the CuCl2-MCl2-H2O (M = Mg, Co) systems at 298.15 K. The necessary thermodynamic functions (binary and ternary ion-interaction parameters and thermodynamic solubility products) were calculated and the theoretical solubility diagrams plotted. A very good agreement was obtained between the calculated and observed data.

Solubility Prediction for the Reciprocal Quaternary System (Li+, Mg2+//Cl-, SO42-–H2O) at 273.15 K Using Pitzer Ion-Interaction Model

2012 ◽  
Vol 549 ◽  
pp. 437-440 ◽  
Author(s):  
Shi Qiang Wang ◽  
Ya Fei Guo ◽  
Tian Long Deng
Keyword(s):  
Quaternary System ◽  
Salt Lake ◽  
Interaction Model ◽  
Linear Regression Method ◽  
Solubility Prediction ◽  
Temperature Dependent ◽  
Solubility Predictions ◽  
Multiple Linear Regression Method ◽  
Ion Interaction Model ◽  
Salt Lake Brine

Solubilities of the reciprocal quaternary system (Li+, Mg2+//Cl-, SO42-–H2O) at 273.15K were calculated using Pitzer and its extended HW model. The values of the Pitzer single-salt parameters β(0), β(1), β(2)and Cφfor LiCl, MgCl2, Li2SO4, and MgSO4, the mixed ion-interaction parameters θLi,Mg, θCl,SO4, ψLi,Mg,Cl, ψLi,Mg,SO4, ψLi,Cl,SO4and ψMg,Cl,SO4, and the Debye–Hückel parameter Aφin the system at 273.15K were derived either temperature-dependent equation or through fitting solubility data of the ternary system by multiple linear regression method. Based on the Jänecke indexes, the phase diagram was plotted. This study affords the necessary parameters for solubility predictions of complicated systems and establishes a theoretical basis for the separation of these valuable minerals from salt lake brine.

Thermodynamic Analysis of the Effect of ZhS6U Alloy Doping Elements on the Process of Circular Chrome-Aluminizing

2016 ◽  
Vol 685 ◽  
pp. 467-472
Author(s):  
Konstantin Bakhrunov
Keyword(s):  
Thermodynamic Analysis ◽  
Thermodynamic Study ◽  
Diffusion Saturation

The work presents a thermodynamic study of the influence of doping elements on diffusion saturation of the surface of ZhS6U nickel heat-proof alloy in activated gas media. The paper analyses initial gas media (activators) and their influence on the process of circular chrome-aluminizing.

Application of the Ion-interaction Model to the Solubility Prediction of LiCl-HCl-MgCl2-H2O System at 20 °C

2005 ◽  
Vol 23 (8) ◽  
pp. 953-956 ◽  
Author(s):  
Li Ya-Hong ◽  
Song Peng-Sheng ◽  
Xia Shu-Ping ◽  
Li Wu ◽  
Gao Shi-Yang
Keyword(s):  
Interaction Model ◽  
Solubility Prediction ◽  
Ion Interaction Model

Enthalpies of dilution of aqueous Li2B4O7 solutions at 298.15K and application of ion-interaction model

2005 ◽  
Vol 435 (2) ◽  
pp. 125-128 ◽  
Author(s):  
Guoyin Yin ◽  
Yan Yao ◽  
Baojuan Jiao ◽  
Sanping Chen ◽  
Shengli Gao
Keyword(s):  
Interaction Model ◽  
Enthalpies Of Dilution ◽  
Ion Interaction Model
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