| 摘要 |
1485494 Nitric acid recovery BRUNSWICK CORP 18 Sept 1974 [23 Oct 1973] 40653/74 Heading C1A A process for recovering nitric acid and ferric oxide from ferric nitrate containing nitric acid solutions, e.g. which have been produced by etching, leaching and pickling processes, comprises adjusting the nitric acid concentration in the solution to the HNO 3 -H 2 O azeotrope value by means of, e.g. flash evaporation, vacuum distillation or low temperature distillation and then distilling the resulting azeotropic solution to effect separation of a HNO 3 -H 2 O mixture of azeotropic concentration and a ferric oxide residue.
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