Berdo R. Technology of joint production nitric acid and calcium nitrate tetrahydrate

Object of study: technology simultaneous production of calcium nitrate and concentrated nitric acid. Purpose: to develop process technology co-production of calcium nitrate and concentrated HNO3. Methods: atomic absorption, macrostructural metallographic, rentgenofazny and derivatografichny analysis. The concentration of substances in solutions-chelatometry. Theoretical and practical results: installed the dependence of the size of the crystals Ca (NO3) 2 from the starting material, mode, medium, crystallization time, identify areas of optimal temperature distillation process. Proposed the technology of co-production of HNO3 and Ca (NO3) 2. Novelty: defined boiling point, the equilibrium partial pressure of Ca (NO3) 2-H2O Found in pairs for nadazeotropnoi HNO3 need to use the initial solution CN concentration of at least 83 wt.% Ca (NO3) 2 at a ratio of CN: NNA = 5:1. The degree of implementation:plans to introduce. The scheme of application: chemical industry.