scholarly journals ENGINEERING AND ECONOMIC EVALUATION OF COUNTERCURRENT AND FIXED BED ION EXCHANGE PROCESSES. TECHNICAL REPORT NO. 7. Report No. 32

1953 ◽  
Author(s):  
N.K. Hiester ◽  
R.K. Cohen ◽  
R.C. Phillips
Keyword(s):  
Economic Evaluation ◽  
Ion Exchange ◽  
Fixed Bed ◽  
Exchange Processes ◽  
Technical Report

Equivalence between Nernst—Planck and “corrected” Fick's law in modeling fixed-bed ion exchange processes

1996 ◽  
Vol 61 (2) ◽  
pp. 123-132 ◽  
Author(s):  
M.Rendueles de la Vega ◽  
J.M. Loureiro ◽  
A.E. Rodrigues
Keyword(s):  
Ion Exchange ◽  
Fixed Bed ◽  
Fick’S Law ◽  
Fick's Law ◽  
Exchange Processes

Removal of Cu(II) and Ni(II) from aqueous solutions using batch and fixed-bed ion exchange processes

Desalination ◽  
2008 ◽  
Vol 225 (1-3) ◽  
pp. 249-259 ◽  
Author(s):  
Li-Chun Lin ◽  
Jiunn-Kwei Li ◽  
Ruey-Shin Juang
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Fixed Bed ◽  
Exchange Processes

scholarly journals Implementation of Ion Exchange Processes for Carbon Dioxide Mineralization Using Industrial Waste Streams

2020 ◽  
Vol 8 ◽  
Author(s):  
Steven Bustillos ◽  
Abdulaziz Alturki ◽  
Dale Prentice ◽  
Erika Callagon La Plante ◽  
Mitchell Rogers ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Divalent Cations ◽  
Water Solution ◽  
Fixed Bed ◽  
Liquid Waste ◽  
Exchange Processes ◽  
Mineralization Processes ◽  
Bed Exchange ◽  
Carbon Dioxide Mineralization ◽  
Exchange Resins

Sequestration of CO2 within stable mineral carbonates (e.g., CaCO3) represents an attractive emission reduction strategy because it offers a leakage-free alternative to geological storage of CO2 in an environmentally benign form. However, the pH of aqueous streams equilibrated with gaseous streams containing CO2 (pH < 4) are typically lower than that which is required for carbonate precipitation (pH > 8). Traditionally, alkalinity is provided by a stoichiometric reagent (e.g., NaOH) which renders these processes environmentally hazardous and economically unfeasible. This work investigates the use of regenerable ion-exchange materials to induce alkalinity in CO2-saturated aqueous solutions such that the pH shift required for mineralization occurs without the need for stoichiometric reagents. Na+-H+ exchange isotherms (at [H+] = 10−8–10−1 M) and rates were measured for 13X and 4A zeolites and TP-207 and TP-260 organic exchange resins in batch equilibrium and fixed-bed exchange experiments, respectively. At solutions equilibrated with CO2 at 1.0 atm (pH = 3.9), H+ exchange capacities for the materials were similar (1.7–2.4 mmol H+/g material) and resulted in pH increases from 3.9 to greater than 8.0. Multi-component mixtures using Ca2+ and Mg2+ cations (at 10−3–10−1 M) in CO2-saturated water were used to probe competitive ion exchange. The presence of divalent cations in solution inhibited H+ exchange, reducing capacities to as low as 0.2 mmol H+/g for both resins and zeolites. Dynamic H+ exchange capacities in fixed-bed ion exchange columns were similar to equilibrium values for resins (∼1.5 mmol/g) and zeolites (∼0.8 mmol/g) using inlet solutions that were equilibrated with gaseous streams of CO2 at 1.0 atm. However, exchange kinetics were limited by intraparticle diffusion as indicated by the increased rate parameters with increasing inlet flow rates (20–160 cm3 min−1). Experimental calcite precipitation from mixing the alkaline CO32−-rich water solution obtained from the ion-exchange column with a simulated liquid waste stream solution achieved thermodynamic maximum yields. The results from these studies indicate that ion exchange processes can be used as an alternative to the addition of stoichiometric bases to induce alkalinity for the precipitation of CaCO3, thereby opening a pathway toward sustainable and economic mineralization processes.

scholarly journals Economic evaluation of ion-exchange processes for nutrient removal and recovery from municipal wastewater

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Xiangjun Huang ◽  
Samuela Guida ◽  
Bruce Jefferson ◽  
Ana Soares
Keyword(s):  
Economic Evaluation ◽  
Ion Exchange ◽  
Nutrient Removal ◽  
Municipal Wastewater ◽  
Exchange Processes ◽  
Removal And Recovery

scholarly journals Theoretical Modelling of Ion Exchange Processes in Glass: Advances and Challenges

2021 ◽  
Vol 11 (11) ◽  
pp. 5070
Author(s):  
Xesús Prieto-Blanco ◽  
Carlos Montero-Orille
Keyword(s):  
Ion Exchange ◽  
Diffusion Coefficients ◽  
Molten Salts ◽  
Theoretical Modelling ◽  
Copper Films ◽  
Theoretical Frameworks ◽  
Self Diffusion ◽  
Exchange Processes ◽  
The One ◽  
Made In

In the last few years, some advances have been made in the theoretical modelling of ion exchange processes in glass. On the one hand, the equations that describe the evolution of the cation concentration were rewritten in a more rigorous manner. This was made into two theoretical frameworks. In the first one, the self-diffusion coefficients were assumed to be constant, whereas, in the second one, a more realistic cation behaviour was considered by taking into account the so-called mixed ion effect. Along with these equations, the boundary conditions for the usual ion exchange processes from molten salts, silver and copper films and metallic cathodes were accordingly established. On the other hand, the modelling of some ion exchange processes that have attracted a great deal of attention in recent years, including glass poling, electro-diffusion of multivalent metals and the formation/dissolution of silver nanoparticles, has been addressed. In such processes, the usual approximations that are made in ion exchange modelling are not always valid. An overview of the progress made and the remaining challenges in the modelling of these unique processes is provided at the end of this review.

Advancement in Ion Exchange Processes for Municipal Wastewater Nutrient Recovery

2013 ◽  
Vol 2013 (7) ◽  
pp. 6474-6485 ◽  
Author(s):  
Allen T. Williams ◽  
Brooke K. Mayer
Keyword(s):  
Ion Exchange ◽  
Municipal Wastewater ◽  
Nutrient Recovery ◽  
Exchange Processes

Ion exchange processes in aqueous-organic media

1969 ◽  
Vol 41 (14) ◽  
pp. 2047-2050 ◽  
Author(s):  
J. L. Pauley ◽  
D. D. Vietti ◽  
C. C. Ou-Yang ◽  
D. A. Wood ◽  
R. D. Sherrill
Keyword(s):  
Ion Exchange ◽  
Organic Media ◽  
Exchange Processes

Ion-exchange processes

1991 ◽  
Vol 10 (1) ◽  
pp. 7-8
Author(s):  
A. Dyer
Keyword(s):  
Ion Exchange ◽  
Exchange Processes
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