Peregudov Yu.S.

ENTHALPY OF INTERACTION OF ION-EXCHANGE HETEROGENEOUS MEMBRANES AND THEIR GRANULAR ANALOGUES WITH AMMONIUM NITRATE SOLUTION

Ion-exchange membranes are widely used for extraction, separation and concentra-tion of aqueous nitrogen-containing solutions. In the study the heterogeneous ion-exchange membranes of cationic type- MK-40, Ralex CM (H) -PP, MK-41 – and anionic type - MA-41, Ralex AM (H) -PP and also their granular analogues – cation exchanger KУ-2·8 and anion exchanger AB-17·8 were used. Sorption of nitrate ions and ammonium ions was conducted from the ammonium nitrate solution with concentration of 0.012 mole / dm³. To determine sorption thermochemical characteristics of the studied ions the calorimetric method was used. It was found that for all the studied types of membranes and ion exchangers the pro-cesses were accompanied by heat evolution. From the calorimetric measurements the ther-mokinetic interaction curves of cation-exchange membranes and KУ-28 with the ammonium nitrate solution and anion-exchange membranes and AB-178 with the solution of the same salt were obtained.

2016, Т. 59, № 7, Стр. 29-34
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