A Selectivity Scale for Some Divalent Cations on Dowex 50

2014

In the present paper the uni-univalent and uni-bivalent ion exchange reactions were investigated using nuclear grade anion exchange resin Indion-223 in H + form. For both H + /K + uni-univalet ion exchange reactions and H + /Mg 2+ uni-bivalet ion exchange reactions, the equilibrium constant K values increases from 0.01710 to 0.02374 and from 0.000177 to 0.000333 respectively as the reaction temperature rises from 35.0 °C to 45.0 °C. The increase in K values with temperature suggest endothermic ion exchange reactions having the enthalpy change values of 22.72 and 51.46 kJ/ mol respectively. The results of such studies will help in selection of suitable ion exchange resins in order to bring about efficient separation of different ionic species present in the waste water effluents released from nuclear as well as chemical process industries.

Section: Introductionmentioning

confidence: 99%

Study of Uni-Univalent H+/K+ and Uni-Bivalent H+/Mg2+ Ion Exchange Reactions Using Nuclear Grade Resin Indion-223

Singare¹,

Mohammed²,

2014

“…Attempts were also made to study the temperature effect on anion exchange systems [38][39][40][41][100][101][102][103][104][105][106][107][108][109][110][111] for computing the thermodynamic equilibrium constants. However very little work was carried out to study the equilibrium of cation exchange systems [85][86][87][88][89][90][91][92][93][94][95][96][97][98][99]. Therefore, in the present investigation, thermodynamics study of uni-bivalent ion exchange reactions was made to predict the selectivity behaviour of strongly acidic gel type nuclear grade cation exchange resin Indion-223 towards some divalent ions in the solution.…”

Section: Introductionmentioning

confidence: 99%

Study on Preferential Selectivity of Nuclear Grade Resin Indion-223 towards some Bivalent Ions

Singare¹,

Mohammed²,

2014

In the present paper attempts are made to understand the selectivity of nuclear grade cation exchange resin Indion-223 in H + form towards Ca 2+ and Mg 2+ bivalent ions in the solution based on thermodynamic concept. It was observed that with rise in temperature the equilibrium constant K values for H + /Ca 2+ uni-bivalet ion exchange reactions increases from 0.000397 to 0.000639. Similarly for H + /Mg 2+ uni-bivalet ion exchange reactions the equilibrium constant K values increases from 0.000177 to 0.000333. The increase in equilibrium constant values with rise in temperature indicate endothermic ion exchange reactions having the enthalpy change values of 38.92 and 51.46 kJ/ mol respectively. The difference in K values and enthalpy values were used to predict the selectivity behaviour of the resin towards the Ca 2+ and Mg 2+ bivalent ions in the solution. The thermodynamic concept of the present study can be applied to understand the selectivity behaviour of different nuclear as well as non-nuclear grade resins towards wide range of ionic species present in the exchanging liquid medium.

“…Attempts were also made to study the temperature effect on anion exchange systems [47,[59][60][61][62][63][64][65][66][67][68][69][70] for computing the thermodynamic equilibrium constants. However very little work was carried out to study the equilibrium of cation exchange systems [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58]. Therefore, in the present investigation, attempts were made to understand the ionic selectivity of the nuclear grade cation exchange resin Indion-223 based on the thermodynamic equilibrium constants.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Uni-Univalent H+/Na+ and Uni-Bivalent H+/Ca2+ Ion Exchange Reactions Using Nuclear Grade Resin Indion-223

Singare¹,

Mohammed²,

2014