Estudio, mediante espectroscopia infrarroja, de la estructura de compuestos amina Primene 81R-H<sub>2</sub>SO<sub>4</sub> y sulfato de la amina-Fe(III)

F. J. Alguacil

doi:10.3989/revmetalm.1999.v35.i4.631

Study of the structure of H₂SO₄-amine Primene 81R and Fe(III)-amine Primene 81R sulphate compounds by infrared spectroscopy

Authors

F. J. Alguacil Centro Nacional de Investigaciones Metalúrgicas, CENIM (CSIC)

DOI:

https://doi.org/10.3989/revmetalm.1999.v35.i4.631

Keywords:

Solvent extraction, Primene 81R, Sulphate, Bisulphate, Iron, Infrared spectroscopy

Abstract

The primary amine Primene 81R extracts sulphuric acid from aqueous solutions to form the corresponding sulphate and bisulphate salts. The infrared study shows that in the sulphate salt, the sulphate group presents a T_d symmetry, whereas the amine bisulphate presents a C_3v symmetry for the bisulphate group. The former of the above compounds, the amine sulphate, is complexed to Fe(III) in sulphate media, and two complexes are extracted depending on temperature. At 8°C or lower temperatures a complex with the stoichiometric formula 4(RNH₃)₂SO₄ (Fe(OH)SO₄)2 is formed, whereas at 50°C or higher temperatures the complex with the stoichiometric formula 3(RNH₃)₂SO₄ (Fe(OH)SO₄)₂ is formed. The infrared spectrum of both complexes is very similar and it is consistent with a weaker interaction between the protons associated with the amine group and the anion, and with a change in the symmetry of the sulphate group respect to the symmetry presented in the amine sulphate salt.

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Published

1999-08-30

How to Cite

Alguacil, F. J. (1999). Study of the structure of H2SO4-amine Primene 81R and Fe(III)-amine Primene 81R sulphate compounds by infrared spectroscopy. Revista De Metalurgia, 35(4), 249–254. https://doi.org/10.3989/revmetalm.1999.v35.i4.631

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Issue

Vol. 35 No. 4 (1999)

Section

Articles

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