Abstract: A process is disclosed for the production of potassium sulfate from potassium chloride by means of a sulfate-laden anion exchanger, according to which as reaction solution, the exchanger is intensively contacted with a saturated potassium chloride solution, after saturation with potassium sulfate, and thereupon again separated, whereupon from this solution the crystals formed therein are separated, while the depleted anion exchanger is regenerated by intensive contact with a magnesium sulfate solution.

Abstract: Sulfate impurities are removed from alkali metal chloride brine electrolysis cell effluent by diluting the effluent to an alkali metal chloride content of less than 150 grams per liter and then contacting the diluted effluent with a weakly basic anion exchange medium.

Abstract: A process for increasing the exchange yield in ion exchange processes is disclosed wherein at least one reaction fraction stored with the previous carrying out of the same exchange reaction, a solution of the exchanging ions supplied from outside and water are delivered to a washed ion exchanger bed which is filled with water and which is charged with the ions which are to be exchanged; and after the discharge from the bed of the water and of a solution obtained as product, the same number of reaction fractions with the same volume is collected and stored as the number as that previously supplied, in order to be delivered as previously with the next carrying out of the same exchange reaction in the identical manner and in the same sequence, and wherein displacement occurring in the direction of flow and relatively to one another of those liquid particles which are delivered simultaneously or in immediate succession to the bed is substantially prevented until the discharge from the container of the bed is reac

Abstract: In an ion exchange process wherein an ion exchange bed is successively charged and discharged during an exchange cycle with an ion, here designated as "X" ion, with "Y" being used to designate the replacing ion and "Z" the oppositely charged ion associated with X and Y, by passing aqueous solutions of the ions through the bed, with the flow thereof during charging being in one direction and during discharging in the opposite direction; the improvement with respect to the discharge portion of the cycle starting with the bed charged with X ions and filled with water substantially free of X, Y and Z ions, comprising passing at least four groups of fractions through said bed, as follows:1) a first feed group of fractions, containing X, Y and Z ions, the concentration of Z ions remaining substantially constant, the concentration of X ions successively decreasing downwardly to or near to zero and the concentration of Y ions correspondingly increasing.