CS269030B1 - Method of production of potassium sulphate - Google Patents

Abstract

After mechanical mixing of 1 mole of ammonium sulfate with 1.75 to 2.25 moles of potassium chloride, after heating to a temperature of 250 to 320 °C, ammonium chloride is separated from potassium sulfate from the reaction mixture by sublimation. The method of producing potassium sulfate from ammonium sulfate and potassium chloride also applies to a solution of ammonium sulfate and potassium chloride in water, and 1.75 to 2.25 moles of potassium chloride are absorbed per 1 mol of ammonium sulfate, while the water is separated by a suitable method, preferably by evaporation, and from the resulting crystalline mixture, ammonium chloride is separated from potassium sulfate by heating to temperature 250 to 320 C.

Description

Potassium sulphate is widely used especially in agriculture and fertilizer production. Given the availability and cost of this raw material to both fertilizer producers and farmers, it is only used in limited quantities.

However, the process for producing potassium sulfate according to the invention will make it possible to use it in agriculture and fertilizer production to a greater extent because the availability of starting materials and their cost will make it possible. The starting material for the production of potassium sulfate according to the present invention is potassium chloride and ammonium sulfate.

The process for producing potassium sulphate according to the invention consists in reacting, after mechanical mixing of ammonium sulphate and potassium chloride in an amount of 1 mole of ammonium sulphate with 1.85 to 2.0 moles of potassium chloride, at a temperature of 250 to 350 [deg.] C., with ammonium chloride is separated by sublimation and potassium sulfate remains in the reactor. Both the ammonium sulfate and potassium chloride conversion components of the present invention, potassium sulfate and ammonium chloride are obtained in such a purity as the purity of the starting materials, which is fully sufficient for both agricultural and fertilizer applications. The production of pure potassium sulphate and ammonium chloride produced by the process of the present invention is possible by known methods, which are not the subject of the present invention.

Example 1 1.5 g of KCl and 1.35 g of (NH 4) 2 SO 4 were mixed in a porcelain dish. Then, in a digester compartment on a sand bath at 310 ° C - 5 ° e, NH 4 Cl was separated from K 2 SO 4 by sublimation.

The isolated K 2 SO 4 had a weight of 1.69 g, corresponding to a yield of 97% by weight. (

Example 2

To an isolated 50 mL flask with an outlet pipe into a flask containing 50 mL of CH 3 OH was added 1.5 g of KCl and 1.35 g of (NH 4) 2 SO 4. NH 4 Cl, trapped in CH 3 OH cooled to -10 ° C, was extruded on a sand bath at 290 ° C - 5 ° C. After evaporation of the methanol, 0.96 g of NH 4 Cl was obtained, corresponding to a yield of 88.8% by weight.

Example 3 In a 150 ml distillation flask, 50 ml of distilled water was added and successively dissolved with 15 g of KCl and 13.5 g of (NH 4) 2 SO 4 · Water was evaporated under reduced pressure at about 70 ° C. The obtained crystalline mixture was treated as in Example 1. 16.5 g of K 2 SO 4 was obtained, corresponding to a yield of 94.8% by weight.

EXAMPLE 4 1.5 g of KCl and 1.35 g of (NH4) 2SO4 were added to 20 ml of distilled water in a porcelain dish. Water was evaporated from the sample. The obtained crystalline mixture was treated as in Example 1. 1.70 g of K 2 SO 4 was obtained, which corresponds to a yield of 97.7% by weight.

Claims (2)

SUBJECT OF THE INVENTION A process for producing potassium sulphate from ammonium sulphate and potassium chloride, characterized in that 1.75 to 2.25 mole of potassium chloride is applied to 1 mole of ammonium sulphate at 200 to 350 ° C, preferably at 250 to 320 ° C. wherein the resulting ammonium chloride reaction is separated from the potassium sulfate by sublimation. 2. The process of claim 1, wherein the process is carried out in an aqueous medium, wherein the water is removed, preferably by evaporation, and the reaction resulting from the ammonium chloride is separated from the potassium sulfate by sublimation.