Two-temperature concentrating of electrolyte solutions on ionites

Two-temperature concentrating of a calcium chloride-sodium chloride solution on a polymethacrylate cationite was demonstrated to occur as this solution continuously flowed through a column packed with this cationite underconditions of periodic temperature changes. The concentration of the solution increased greatly during the "cold" stage of process and decreased during the "hot" stage. The concentration of the solution in contact with the polymethacrylate cationite was found to change due to the effect of temperature on the degree of swelling of the cationite. At the same time, no temperature-induced changes in the concentration were observed in a similar solution brought in contact with an iminodiacetate polyampholyte with a polystyrene matrix.