Process for obtaining potassium nitrate

The present invention relates to a process for the manufacture of potassium nitrate with co-production of relatively concentrated aqueous solution of hydrochloric acid According to the invention, potassium chloride and nitric acid are reacted in the medium of an organic solvent selected from butanols and pentanols The solution obtained after the separation of the resulting potassium nitrate, containing hydrochloric acid together with nitric acid and said organic solvent, is subsequently washed thus resulting an aqueous solution of hydrochloric acid which contains nitric acid The nitric acid is extracted by an organic solvent selected from organic esters of phosphoric acid, ketones having five to ten carbon atoms and straight or cyclic polyethers having molecular weight in the range of 100 to 1000 and polyalkylene glycols which are slightly miscible in water and having molecular weight in the range of 1000 to 3000, or mixtures thereof, preferably in the presence of an organic diluent The remaining brine consists of a substantially nitrate-free hydrochloric acid The NO3 - -loaded solvent is washed, the nitric acid as well as the organic solvent being respectively recycled in the process The process saves appreciable amounts of nitric acid, co-producing hydrochloric acid which can be utilized without any further concentrating step

Process for obtaining potassium nitrate

References

Process for the manufacture of potassium nitrate with co-production of hydrochloric acid

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