Determination of water in ion-exchange resins: anion exchange resins

1970 ◽  
Vol 42 (11) ◽  
pp. 1287-1290 ◽  
Author(s):  
Hari Dutta. Sharma ◽  
Natarajan. Subramanian
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Ion Exchange Resins ◽  
Anion Exchange Resins ◽  
Exchange Resins

scholarly journals Adsorption of Anthocyanins by Cation and Anion Exchange Resins with Aromatic and Aliphatic Polymer Matrices

2020 ◽  
Vol 21 (21) ◽  
pp. 7874
Author(s):  
Natalia Pismenskaya ◽  
Veronika Sarapulova ◽  
Anastasia Klevtsova ◽  
Sergey Mikhaylin ◽  
Laurent Bazinet
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Electrostatic Interactions ◽  
Exchange Resin ◽  
External Solution ◽  
Ion Exchange Resins ◽  
Internal Solution ◽  
Ph Shift ◽  
Anion Exchange Resins ◽  
Exchange Resins

This study examines the mechanisms of adsorption of anthocyanins from model aqueous solutions at pH values of 3, 6, and 9 by ion-exchange resins making the main component of heterogeneous ion-exchange membranes. This is the first report demonstrating that the pH of the internal solution of a KU-2-8 aromatic cation-exchange resin is 2-3 units lower than the pH of the external bathing anthocyanin-containing solution, and the pH of the internal solution of some anion-exchange resins with an aromatic (AV-17-8, AV-17-2P) or aliphatic (EDE-10P) matrix is 2–4 units higher than the pH of the external solution. This pH shift is caused by the Donnan exclusion of hydroxyl ions (in the KU-2-8 resin) or protons (in the AV-17-8, AV-17-2P, and EDE-10P resins). The most significant pH shift is observed for the EDE-10P resin, which has the highest ion-exchange capacity causing the highest Donnan exclusion. Due to the pH shift, the electric charge of anthocyanin inside an ion-exchange resin differs from its charge in the external solution. At pH 6, the external solution contains uncharged anthocyanin molecules. However, in the AV-17-8 and AV-17-2P resins, the anthocyanins are present as singly charged anions, while in the EDE-10P resin, they are in the form of doubly charged anions. Due to the electrostatic interactions of these anions with the positively charged fixed groups of anion-exchange resins, the adsorption capacities of AV-17-8, AV-17-2P, and EDE-10P were higher than expected. It was established that the electrostatic interactions of anthocyanins with the charged fixed groups increase the adsorption capacity of the aromatic resin by a factor of 1.8–2.5 compared to the adsorption caused by the π–π (stacking) interactions. These results provide new insights into the fouling mechanism of ion-exchange materials by polyphenols; they can help develop strategies for membrane cleaning and for extracting anthocyanins from juices and wine using ion-exchange resins and membranes.

scholarly journals Radiotracer Technique in Study of Strongly Basic Anion Exchange Resins Dowex-SBR LC and Indion-454

2013 ◽  
Vol 18 ◽  
pp. 37-49
Author(s):  
P.U. Singare
Keyword(s):  
Ion Exchange ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Isotopic Exchange ◽  
Ion Exchange Resins ◽  
Anion Exchange Resins ◽  
Isotopic Exchange Reaction ◽  
Bromide Ion ◽  
Exchange Resins

The present paper demonstrates application of isotopic tracer technique in characterization of anion exchange resins Dowex-SBR LC and Indion-454 for which 131I and 82Br radio isotopes were used. The characterization was made based on iodide and bromide ion-isotopic exchange reaction kinetic data obtained for the two resins. It was observed that during iodide ion-isotopic exchange reaction performed at 35.0 °C, 1.000 g of ion exchange resins and 0.002 mol/L labeled iodide ion solution, the values of specific reaction rate (min-1), amount of ion exchanged (mmol), initial rate of ion exchange (mmol/min) and log Kd were 0.379, 0.426, 0.161 and 16.2 respectively for Dowex-SBR LC resin, which was higher than the respective values of 0.156, 0.243, 0.038 and 13.4 as that obtained by using Indion-454 resins. The identical trend was observed for the two resins during bromide ion-isotopic exchange reaction. The results of present investigation also indicate that during the two ion-isotopic exchange reactions, for both the resins, there exists a strong positive linear correlation between amount of ions exchanged and concentration of ionic solution; and strong negative correlation between amount of ions exchanged and temperature of exchanging medium. Based on overall results it appears that under identical experimental conditions, as compared to Indion-454 resins, Dowex-SBR LC resins show superior performance. It is expected here that the present technique can be extended further for characterization of different ion exchange resins which will further help in the selection of those reins for the specific industrial application

scholarly journals Use of ion exchange resins for tartrate wine stabilization

OENO One ◽  
2006 ◽  
Vol 40 (4) ◽  
pp. 223 ◽  
Author(s):  
Helena Mira ◽  
Patricia Leite ◽  
Jorge Manuel Ricardo-da-Silva ◽  
António Sérgio Curvelo-Garcia
Keyword(s):  
Ion Exchange ◽  
Organic Acid ◽  
Cation Exchange ◽  
Anion Exchange ◽  
Acid Composition ◽  
Previous Treatment ◽  
Ion Exchange Resins ◽  
Anion Exchange Resins ◽  
Exchange Resins

<p style="text-align: justify;">The application of the cation exchange and double cation-anion exchange resins, regarding the wine tartrate stabilization, without previous treatment of wine by cold has been studied as well as their influence in phenolic, mineral and organic acid composition. The R1 resin was used in Mg2+, Na+ and H+ form, the R2 resin was always used in H+ form, and the R3 was used in OH- form. The eluted wine was assembled with untreated wine to obtain stable wine. The R2 resin showed to be more efficient to enhance the tartrate stabilization than R1 in Mg2+ form; however in H+ form, the behaviour of both resins was quite similar. The tartrate stabilization results to double cation anion exchange were similar to the results obtained with cation exchange.</p>

Selection of Ion Exchange Resins for Tungsten and Molybdenum Separation

2014 ◽  
Vol 997 ◽  
pp. 363-367
Author(s):  
Guang Sheng Huo ◽  
Qiong Song ◽  
Chun Hua Liao
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Ion Exchange Resins ◽  
Test Results ◽  
Strong Base ◽  
Anion Exchange Resins ◽  
Low Concentrations ◽  
High Concentrations ◽  
Weak Base Anion Exchange ◽  
Exchange Resins

A solution containing tungsten and molybdenum was acidified using hydrochloric acid, and the ability of several commercial ion exchange resins to separate tungsten and molybdenum was evaluated. The results from the acidification test indicate that when the pH of the solution is adjusted to 7.0, WO42- is polymerized into HW6O215-, while MoO42- is not. The test results of resins selection show that the D213 resin and the D308 resin are superior to other resins in separating low concentrations of tungsten and molybdenum, whereas the D201 resin and the D309 resin are suitable for separating high concentrations of tungsten and molybdenum. The results from the column test indicate that weak-base anion exchange resins are better than strong-base anion exchange resins for both low and high concentrations of tungsten and molybdenum.

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