Salt 4
Salt 4 : An obsolete, two-stage process for obtaining chlorine and sodium nitrate from sodium chloride by the intermediary of nitrosyl chloride. In the first stage, the sodium chloride was reacted with nitric acid, producing nitrosyl chloride and chlorine: 3NaCl + 4HNO3 + NOCl + Cl2 + 2H2O + 3NaNO3. In the second, the nitrosyl chloride was either reacted with sodium carbonate: 3NOCl + 2Na2CO3 + NaNO3 + 3NaCl + 2CO2 + 2NO or oxidized with oxygen: 2NOCl + O2 + N2O4 + Cl2. The sodium nitrate was used as a fertilizer. The evolution of the process was complex; the book referenced below lists 63 patents relating to it. (Check source for accuracy of chemical formula)
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