Ion-Exchange Equilibria at High Hydrostatic Pressures. The Hydrogen Ion—Potassium Ion and Hydrogen Ion—Strontium Ion Systems on Sulfonic Acid-Type Cation-Exchange Resins

The proton magnetic resonance spectra of cation-exchange resins of crosslinkage X1 to X16 in the H+, Li+, Na+, K +, Rb+, Cs+, and NH4+ forms have been recorded and the values of the molal chemical shift, δM+0, are found to be −0.321, −0.005, 0.041, 0.031, 0.028, 0.015, and 0.00 (assumed) p.p.m./mole, respectively, for the cations. These values are very nearly equal to those observed in corresponding aqueous solutions, indicating that ion–solvent interactions are similar in both the resin matrix and the aqueous solution. The temperature dependence of the chemical shift shows the same trend. The effective hydration numbers calculated from the temperature dependence are 2.0 (4.81 m) for the H+ form, 4.8 (3.25 m) and 3.6 (5.26 m) for the Na+ form, 4.4 (3.9 m) for the K+ form, and 2.4 (6.18 m) for the Cs+ form. The ions in the resin phase behave as solutions of strong electrolyte, which is consistent with the polyelectrolyte gel model for the ion-exchange resin.

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Studies on Ion Exchange Resins. VIII. Activity Coefficients of Diffusible Ions in Various Cation-exchange Resins

Journal of the American Chemical Society ◽

10.1021/ja01110a067 ◽

1953 ◽

Vol 75 (14) ◽

pp. 3539-3543 ◽

Cited By ~ 15

Author(s):

Harry P. Gregor ◽

Melvin H. Gottlieb

Keyword(s):

Ion Exchange ◽

Cation Exchange ◽

Activity Coefficients ◽

Ion Exchange Resins ◽

Cation Exchange Resins ◽

Exchange Resins

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Kinetics of ion exchange sorption of oxytetracycline on phosphoric acid cation exchange resins

Pharmaceutical Chemistry Journal ◽

10.1007/bf01156281 ◽

1976 ◽

Vol 10 (9) ◽

pp. 1221-1224

Author(s):

N. N. Momot ◽

G. V. Samsonov ◽

N. S. Rakutina

Keyword(s):

Ion Exchange ◽

Phosphoric Acid ◽

Cation Exchange ◽

Cation Exchange Resins ◽

Acid Cation ◽

Exchange Resins ◽

Kinetics Of ◽

Kinetics Of Ion Exchange

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Ammonium removal from anaerobic digester effluent by ion exchange

Water Science & Technology ◽

10.2166/wst.2009.317 ◽

2009 ◽

Vol 60 (1) ◽

pp. 201-210 ◽

Cited By ~ 20

Author(s):

T. Wirthensohn ◽

F. Waeger ◽

L. Jelinek ◽

W. Fuchs

Keyword(s):

Ion Exchange ◽

Cation Exchange ◽

Reverse Osmosis ◽

Exchange Capacity ◽

Ammonium Concentration ◽

Effluent Quality ◽

Ammonium Removal ◽

Anaerobic Digester Effluent ◽

Cation Exchange Resins ◽

Exchange Resins

The effluent of a 500 kW biogas plant is treated with a solid separation, a micro filtration and a reverse osmosis to achieve nutrient recovery and an effluent quality which should meet disposal quality into public water bodies. After the reverse osmosis, the ammonium concentration is still high (NH4-N = 467 mg/l), amongst other cations (K+=85 mg/l; Na+=67 mg/l; Mg2 + =0.74 mg/l; Ca2 + =1.79 mg/l). The aim of this study was to remove this ammonium by ion exchange. Acidic gel cation exchange resins and clinoptilolite were tested in column experiments to evaluate their capacity, flow rates and pH. Amberjet 1,500 H was the most efficient resin, 57 BV of the substrate could be treated, 1.97 mol NH4-N/l resin were removed. The ammonium removal was more than 99% and the quality of the effluent was very satisfactory (NH4-N < 2 mg/l). The breakthrough of the observed parameters happened suddenly, the order was sodium—pH—ammonium—potassium. The sharp increase of the pH facilitates the online control, while the change in conductivity is less significant. A regeneration with 3 bed volumes of 2 M HCl recovered 91.7% of the original cation exchange capacity.

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