METHOD OF DETERMINING DYNAMIC SORPTION CAPACITY OF COMPLEX FORMING IONITES BY IONS OF TRANSITION METALS Russian patent published in 2015 - IPC G01N30/02 

FIELD: chemistry.

SUBSTANCE: invention relates to application of ion-exchange processes, ionites, namely complex-forming ionites (complexite), for instance, highly basic anionites in form of complex-forming agents, and can be applied for determination of dynamic sorption capacity of complexites by ions of transition metals (TM). Method includes forced filtration of fixed volume of model solution (V_S) with known initial concentration TM (C₁) from reservoir from top to bottom through column with specified volume of complexite (V_C) at speed, maximally approximated to conditions of industrial application of ionites. Filtrate after column is returned back into reservoir at the same speed constantly and in forced way, and filtered model solution in reservoir is heated with temperature of solution being supported in the ranges of passport limitations of ionites by thermal stability. In the process of filtration microvolumes of model solution samples are periodically taken from reservoir and concentration of TM in them is determined. Then, time of filtration beginning and current time of uptake of microvolume of model solution samples from reservoirs are registered. After that, graph of transition metal concentration change is equilibrium solution in reservoir depending on filtration time is built, and filtration is stopped when concentration of transition metal in reservoir stops decreasing and stabilises, or starts to increase. Then, final minimal concentration of transition metal of equilibrium solution in reservoir (C₂) is registered and estimation of sorption capacity is performed by equation: DSC_M=[(C₁-C₂)×V_S]/V_C. Obtained DSC_M value corresponds to chemical composition of model solution, equilibrium pH value of solution in vessel after finish of filtration and specified filtration speed.

EFFECT: possibility to determine dynamic sorption capacity of complex-forming ionites by ions of TM at speeds of filtration, satisfying conditions of industrial application of ionites, and with lower time consumption.

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