NOVELTY - Producing potassium sulfate comprises reacting (16) a source of water soluble potassium with a magnesium sulfate-containing substance in presence of an aqueous alcoholic solution.    USE - The process is useful for producing potassium sulfate, which is useful as fertilizer. No biological data given.    ADVANTAGE - The process: provides chlorine-free potassium sulfate with high purity; avoids the high temperature, low energy efficiencies and corrosive situations along with chloride contamination; and utilizes broad spectrum of potassium sources, which adds to the flexibility of the process.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a system for the production of potassium sulfate, comprising a first reactor for dissolving a water soluble potassium in water into a first solution, a second reactor for dissolving magnesium sulfate hydrate in water and adding methanol into a second solution, a third reactor, adapted to receive the first and the second solutions, mixed then under stirring and cool them down into a slurry, a filter collecting and filtering the slurry from the third reactor, delivering, after rinsing of the solid part with methanol, chloride-free potassium sulfate and a combined filtrate and rinsings, a column receiving and distilling the combined filtrate and rinsings, delivering methanol back to the second reactor and to the filter and a concentrated solution of magnesium chloride, a fourth reactor, adapted to receive the concentrated solution of magnesium chloride, which crystallizes upon cooling and to treat the concentrate with sulfuric acid, delivering hydrochloric acid and a residual mass, a collector, adapted to absorb the hydrochloric acid delivered from the fourth reactor and a fifth reactor, adapted to collect and crystallize the residual mass from the fourth reactor, for recycling to the second reactor as magnesium sulfate heptahydrate.    DESCRIPTION OF DRAWING(S) - The figure shows flowchart of process of producing potassium sulfate.    Preparation of saturated solution of potassium chloride in water at 60 degrees C (solution A) (12)    Preparation of a saturated water-methanol solution of magnesium sulfate hepta hydrate at 60 degrees C (solution B) (14)    Mixing solution A with solution B (16)    Filtering (18)    Rinsing with methanol (20)