Study of the Conversion of CaSO4 to CaCO3 within the CaSO4 + Na2CO3 = CaCO3 + Na2SO4 Four-Component Water-Salt System

1995 ◽  
Vol 60 (12) ◽  
pp. 2107-2111 ◽  
Author(s):  
Dimitar Trendafelov ◽  
Christomir Christov ◽  
Christo Balarew ◽  
Aneta Karapetkova
Keyword(s):  
Free Energy ◽  
Calcium Sulfate ◽  
Interaction Model ◽  
Sea Salt ◽  
Salt System ◽  
Molar Gibbs Free Energy ◽  
High Dispersity ◽  
Water Salt ◽  
Solubility Products ◽  
Ion Interaction Model

The Pitzer ion-interaction model was employed to predict the conversion in the title quaternary water-salt system. The thermodynamic solubility products (Ks0) were determined and the conversion of CaSO4 to CaCO3 in the CaSO4 + Na2CO3 = CaCO3 + Na2SO4 system was predicted. The standard molar Gibbs free energy ∆rG0 of the conversion reaction was calculated to be -23.62 kJ mol-1. A 98% degree of conversion of CaSO4 was achieved by using calcium sulfate isolated from sea salt production waste brines. Suitable conditions were found for obtaining CaCO3 exhibiting a high dispersity and whiteness.

Pitzer Model Based Study of CsX-NiX2-H2O (X = Cl, Br) Systems at 298.15 K

1996 ◽  
Vol 61 (4) ◽  
pp. 501-506 ◽  
Author(s):  
Christomir Christov
Keyword(s):  
Thermodynamic Functions ◽  
Interaction Model ◽  
Pitzer Model ◽  
Solubility Diagrams ◽  
Model Based ◽  
Solubility Products ◽  
Ternary Parameters ◽  
Ion Interaction Model ◽  
Good Agreement

The Pitzer ion-interaction model was used for simulating the CsX-NiX2-H2O (X = Cl, Br) systems at 298.15 K. The necessary thermodynamic functions (binary and ternary parameters, thermodynamic solubility products) were calculated and the theoretical solubility diagrams plotted. A very good agreement was found between the calculated and observed data.

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.

scholarly journals Mutual Solubility of Pyridine Base-Water-Salt System

1958 ◽  
Vol 78 (8) ◽  
pp. 837-841 ◽  
Author(s):  
Sozaburo Arakawa ◽  
Taro Kawaguchi ◽  
Hiromasa Kato
Keyword(s):  
Mutual Solubility ◽  
Salt System ◽  
Pyridine Base ◽  
Water Salt

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.

scholarly journals Multiphase Open Phase Processes Differential Equations

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 148
Author(s):  
Nikolay Charykov ◽  
Marina Charykova ◽  
Konstantin Semenov ◽  
Victor Keskinov ◽  
Alexey Kurilenko ◽  
...  
Keyword(s):  
Differential Equations ◽  
Phase Diagrams ◽  
Thermodynamic Modeling ◽  
Van Der Waals ◽  
Salt System ◽  
Thermodynamic Approach ◽  
Topological Isomorphism ◽  
Van Der Waals Equation ◽  
Open Phase ◽  
Water Salt

The thermodynamic approach for the description of multiphase open phase processes is developed based on van der Waals equation in the metrics of Gibbs and incomplete Gibbs potentials. Examples of thermodynamic modeling of the multiphase and multicomponent A3B5 systems (In-Ga-As-Sb and In-P-As-Sb) and Na+, K+, Mg2+, Ca2+//Cl−, SO42−-H2O water–salt system are presented. Topological isomorphism of different type phase diagrams is demonstrated.

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