Abstract
For the recovery and purification of nitric acid from an aqueous solution containing a variety of dilute organic or inorganic acids, vapor-liquid equilibrium (VLE) data are needed. A search of the literature did not yield sufficient reliable VLE data for such mixtures, so an experimental study on VLE K-values (=y/x) of organic and inorganic acids at diluted concentration in nitric acid-water mixtures was carried out. Using the modified Rose-Williams still multicomponent VLE data were measured under reduced pressures. The concentration range of HNO 3 is 0.0 to 0.35 mole fraction where appreciable decomposition does not occur. A range of 50–1000 ppm of HCl and various carboxylic acids (HCOOH, CH 3COOH, C 2H 5COOH and C 3H 7COOH) were added to HNO 3 aqueous solutions. K HCl changed from 0.01 to 100 and had positive logarithmic dependence on HNO 3 content. K-values of organic acids were represented by a quadratic function of HNO 3 concentration.
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