Environmental and Energy Engineering
Extraction of nitric acid from aqueous media with Oϕ D(iB)CMPO–n-dodecane
Article first published online: 17 JUN 2004
Copyright © 1997 American Institute of Chemical Engineers
Volume 43, Issue 2, pages 555–564, February 1997
How to Cite
Spencer, B. B., Counce, R. M. and Egan, B. Z. (1997), Extraction of nitric acid from aqueous media with Oϕ D(iB)CMPO–n-dodecane. AIChE J., 43: 555–564. doi: 10.1002/aic.690430228
- Issue published online: 17 JUN 2004
- Article first published online: 17 JUN 2004
- Manuscript Revised: 5 AUG 1996
- Manuscript Received: 13 MAY 1996
A study of the extraction characteristics of nitric acid with octyl(phenyl)-N,N-diisobutylcarbamoylmethyl phosphine oxide [OϕD(iB)CMPO or, simply, CMPO] was conducted. In the experimental program, CMPO was dissolved in n-dodecane to produce the organic extracting medium. The objectives of the project were to infer extraction stoichiometry and to estimate equilibrium constants for the extraction of nitric acid with the CMPO extractant.
Experiments were performed over a limited range of concentrations to avoid conditions favoring formation of a third phase. Aqueous nitric acid concentrations were limited to 0.30 M at 25°C, 1.0 M at 40°C, and 3.0 M at 50°C. The data indicate that CMPO extracts nitric acid with a 1:1 stoichiometry. The value of the equilibrium constant is estimated at 2.66 ± 0.09 at 25°C. The enthalpy of the extraction is estimated to be - 5.46 ± 0.46 kcal/mol.