Gibbs Energy Minimization Model for Solvent Extraction with Application to Rare-Earths Recovery

2019 ◽  
Vol 53 (13) ◽  
pp. 7736-7745 ◽  
Author(s):  
Chukwunwike O. Iloeje ◽  
Carlos. F. Jové Colón ◽  
Joe Cresko ◽  
Diane J. Graziano
Keyword(s):  
Solvent Extraction ◽  
Gibbs Energy ◽  
Rare Earths ◽  
Energy Minimization ◽  
Gibbs Energy Minimization

Inclusion of the Donnan effect in Gibbs energy minimization

2006 ◽  
Vol 125 (1) ◽  
pp. 58-61 ◽  
Author(s):  
Risto Pajarre ◽  
Pertti Koukkari ◽  
Erkki Räsänen
Keyword(s):  
Gibbs Energy ◽  
Energy Minimization ◽  
Gibbs Energy Minimization ◽  
Donnan Effect

Teaching the Concept of Gibbs Energy Minimization through Its Application to Phase-Equilibrium Calculation

2016 ◽  
Vol 93 (9) ◽  
pp. 1569-1577 ◽  
Author(s):  
Romain Privat ◽  
Jean-Noël Jaubert ◽  
Etienne Berger ◽  
Lucie Coniglio ◽  
Cécile Lemaitre ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Gibbs Energy ◽  
Energy Minimization ◽  
Equilibrium Calculation ◽  
Gibbs Energy Minimization

Calculation of constrained equilibria by Gibbs energy minimization

Calphad ◽  
2006 ◽  
Vol 30 (1) ◽  
pp. 18-26 ◽  
Author(s):  
Pertti Koukkari ◽  
Risto Pajarre
Keyword(s):  
Gibbs Energy ◽  
Energy Minimization ◽  
Gibbs Energy Minimization

Prediction of Solid-Aqueous Equilibria in Cementitious Systems Using Gibbs Energy Minimization: II. Dual Thermodynamic Approach to Estimation of the Nonideality of End-Member Parameters

1997 ◽  
Vol 506 ◽  
Author(s):  
D.A. Kulik ◽  
V.A. Sinitsyn ◽  
I.K. Karpov
Keyword(s):  
Heavy Metals ◽  
Gibbs Energy ◽  
Energy Minimization ◽  
Direct Calculation ◽  
Difficult Problem ◽  
Gibbs Energy Minimization ◽  
Hazardous Waste Disposal ◽  
Multi Phase ◽  
Geochemical Studies ◽  
Cementitious Systems

Prediction of pathways of radionuclides, heavy metals and other harmful components isolated in cementitious matrices is considered critical in geochemical studies related to hazardous waste disposal [1-3]. Hence, rigorous multi-phase multi-aggregate thermodynamic models with appropriate kinetic and metastability constraints can be very helpful in solving this difficult problem. In a companion contribution [4], we demonstrate that usage of the Gibbs energy minimization (GEM) algorithms permits direct calculation of solid solution – aqueous solution (SSAS) equilibria which adequately describe the solubility data. The suggested "core" thermodynamic dataset can be extended and tuned on the basis of solubility, mineralogical and petrographical studies of fresh, aged and doped cements.

Gibbs Energy Minimization Method for Analysis of Methane Oxidation to Higher Hydrocarbons

2012 ◽  
Author(s):  
Nor Aishah Saidina Amin ◽  
Ee Peng Soon
Keyword(s):  
Gibbs Energy ◽  
Methane Oxidation ◽  
Energy Minimization ◽  
Methane Conversion ◽  
Minimization Method ◽  
Gibbs Energy Minimization ◽  
System Pressure ◽  
Conversion Of Methane ◽  
Higher Hydrocarbons ◽  
Energy Minimization Method

Kaedah peminimuman jumlah tenaga Gibbs sangat berguna untuk menganalisis kemungkinan penukaran metana kepada hidrokarbon dan syngas pada suhu dan tekanan tertentu secara teoritikal. Keputusan numerik menunjukkan penukaran metana meningkat dengan peningkatan kepekatan oksigen dan suhu tindak balas. Bagaimanapun, kehadiran oksigen merencat pembentukan hidrokarbon tinggi yang kebanyakannya mengandungi aromatik, tetapi menggalakkan pembentukan hidrogen. Apabila tekanan sistem bertambah, hasil aromatik, olefin dan hidrogen berkurang, tetapi hasil parafin meningkat. Karbon monoksida menjadi produk mengandungi oksigen yang utama daripada pengoksidaan metana sementara hampir tiada H2O, CH3OH and HCOH yang dikesan walaupun sejumlah kecil karbon dioksida terbentuk pada suhu yang agak rendah dan tekanan tinggi. Kata kunci: Keseimbangan kimia termodinamik, peminimuman jumlah tenaga Gibbs, penukaran metana, hidrokarbon tinggi The total Gibbs energy minimization method is useful to theoretically analyze the feasibility of methane conversion to higher hydrocarbons and syngas at the selected temperature and pressure. Numerical results showed that the conversion of methane increased with oxygen concentration and reaction temperature, but decreased with pressure. Nevertheless, the presence of oxygen suppressed the formation of higher hydrocarbons that mostly consisted of aromatics, but enhanced the formation of hydrogen. As the system pressure increased, the aromatics, olefins and hydrogen yields diminished, but the paraffin yield improved. Carbon monoxide seemed to be the major oxygen-containing equilibrium product from methane oxidation whilst almost no H2O, CH3OH and HCOH were detected although traces amount of carbon dioxide were formed at relatively lower emperature and higher pressure. Key words: Thermodynamic chemical equilibrium, Gibbs energy minimization, methane conversion, higher hydrocarbons

Combination of overall reaction rate with Gibbs energy minimization

1997 ◽  
Vol 136 (1-2) ◽  
pp. 345-362 ◽  
Author(s):  
Pertti Koukkari ◽  
Ismo Laukkanen ◽  
Simo Liukkonen
Keyword(s):  
Gibbs Energy ◽  
Energy Minimization ◽  
Reaction Rate ◽  
Gibbs Energy Minimization
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