What are methods of producing potassium nitrate - Shanghai xin chemical industry

solvent extraction: in 5 ~ 10 & deg; C, potassium chloride dissolved in nitric acid concentration of 60% ~ 70%, organic solvent extraction, separation of potassium nitrate and hydrochloric acid.

synthesis: with nitric acid potassium hydroxide or potassium carbonate neutralization, evaporation crystallization made the potassium nitrate; With potassium hydroxide or potassium carbonate solution absorption of nitric acid tail gas in the production of fabricated and potassium nitrate.

ion exchange process, the ammonium nitrate and potassium chloride liquid by cation exchange resin bed, respectively. Can produce potassium nitrate and ammonium chloride respectively two kinds of products. This method is more, in industrial application is one of the main mode of production in industrial potassium nitrate.

double decomposition method, sodium nitrate and potassium chloride by double decomposition reaction of potassium nitrate and sodium chloride. Use them at different temperatures of the solubility of different can be separated. This method is more, in industrial application is the main mode of production of industrial potassium nitrate. The sodium nitrate soluble in hot water, first under stirring in sodium nitrate, potassium chloride = 100:85 ingredients than gradually add potassium chloride, via evaporation concentration, when the temperature is 119 ℃, the sodium chloride crystallization precipitation, will be hot solution and crystal filter, get a large amount of sodium chloride crystal, then the mother liquor after separation of sodium chloride, slow cooling and potassium nitrate crystallization precipitation. The suction filter, washing and drying for a quick coarse product ( Purity & ge; 85%) , then through recrystallization refinement and high refinement.