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During the manufacture of steel products, organic compounds are used for rolling, degreasing assembling and protection. The purpose of this research is to develop a system for removing the organic residues from surface, prior to chemical anlaysis. This paper describes the use of supercritical fluid extraction (SFE). The main advantage of supercritical fluid is the possibility of monitoring its density.

Then, by acting on pressure or temperature, one can change the solvatation power of the medium. The results emphasize that an increase in temperature does not improve extraction efficiency, whereas an increase in pressure produces a strong effect on the dissolution. Quantitative results are obtained by Fourier Transform Infrared (FTIR) surface analysis. The FTIR spectra show that only the organic species which are strongly bounded to the surface remain after SFE. These compounds have been identified as iron soaps. A chemical procedure has been developed, in order to analyse these compounds in a quantitative way. An hypothesis involving three types of iron soaps is proposed. A study of the association of supercritical fluid extraction and gas chromatography has been carried out. .

Additional information

Authors: HOCQUAUX H, IRSID, Fraisses (FR);DE WERBIER P, IRSID, Fraisses (FR)
Bibliographic Reference: EUR 15573 FR (1996) 51pp., FS, ECU 7
Availability: Available from the (2)
ISBN: ISBN 92-827-6191-6
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