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Volume 7, Issue 6(Suppl) J Chromatogr Sep Tech
ISSN: 2157-7064 JCGST, an open access journal
Page 76
Notes:
Separation Techniques 2016
September 26-28, 2016
conferenceseries.com
Separation Techniques
September 26-28, 2016 Valencia, Spain
2nd International Conference and Expo on
Purification of phosphoric acid by liquid-liquid
Mariana Campos Assuncao1,2,3, Alexandre Chagnes1,3, Hubert Halleux2 and Gerard Cote1,3
1PSL Research University, France
2Prayon, Belgium
3Chimie ParisTech - CNRS, France
Phosphoric acid is a weak oxyacid with many industrial applications depending on its degree of purification, including
surface treatments or fertilizer production (merchant grade Phosphoric Acid, MPA), salt production for animal feeding or
acidification of food and drinks for human consumption (Food grade Phosphoric Acid, FPA), and pharmaceutical industry
(Pharmaceutical grade Phosphoric Acid, PPA). In order to produce these different grades, various purification technologies
can be implemented including hydrometallurgical processes as it is the case in the Prayon’s process based on the selective
liquid-liquid extraction of phosphoric acid. The current solvent used by Prayon’s process for purifying phosphoric acid is a
mixture of 90 wt% di-iso-propylether (DIPE) and 10 wt% tri-n-butylphosphate (TBP). There is very few information about
the physicochemistry involved in the purification of wet phosphoric acid by liquid-liquid extraction because wet phosphoric
acid is a very complex medium (highly concentrated medium which can reach 14 M, high complexing power, only few data
on metal speciation in phosphoric acid, etc.). Furthermore, liquid-liquid extraction of phosphoric acid involves very complex
phenomena such as phase splitting and third phase formation which can be explained by the presence of supramolecular species
in solution as well as coextraction of large amount of water. In the present paper, the physicochemistry involved in phosphoric
acid and water extraction by new extraction solvents is presented with a focus on decrypting the role of the supramolecular
organization. Inedit data on the transitions from triphasic systems towards biphasic systems are presented and a focus has been
placed on the description of forces playing a role in these transitions.
Biography
Mariana Campos Assuncao is currently a PhD student at Chimie ParisTech conducting a research project on the purification of phosporic acid in collaboration with
Prayon. Before this experience, she has obtained a Master’s degree in Nuclear Energy at Chimie ParisTech and an Engineering degree in Chemical Engineering
at INSA de Rouen.
Mariana Campos Assuncao et al., J Chromatogr Sep Tech 2016, 7:6(Suppl)