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Développement d’une vanne d’injection de liquide pour l’analyse en ligne par chromatographie en phase gazeuse et ses applications dans le domaine du raffinage : étude du comportement et apport des colonnes monolithiques courtes pour la chromatographie en phase gazeuse haute pression

Abstract : In industry, although on-line analysis of gaseous effluents using gas chromatography is carried out without major difficulty, the analysis of liquids remains problematic and is one of the main issues to be solved. Indeed, compared to an analysis carried out in a laboratory, the on-line analysis of a liquid sample would bypass the steps of sampling and preparation prior to injection and would avoid problems of contamination and representativeness of the sample. Systems for injecting liquids on-line are currently available; however, difficulties are encountered, due to the discrimination of analytes. It is in this context that a valve dedicated to the on-line injection of liquids was developed, validated under laboratory conditions and finally implemented in the oil industry. Another issue, related, amongst other things, to the reduction of maintenance and installation costs, as well as to the compatibility of analytical systems for industry and for micro-pilots, steered instrumental developments towards the miniaturization of systems. Different technological bricks were therefore brought together to assess the feasibility of a miniaturized system involving the technology for on-line injection of liquid. Finally, and still in the context of miniaturization, short monolithic columns were implemented in gaseous phase chromatography at high pressure, first in the laboratory and then on industrial gas effluents. They allowed very fast analyses to be performed which had greater efficiency per unit of length while still being able to act on the selectivity of the columns thanks to the control of their surface properties
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Adrien Maniquet. Développement d’une vanne d’injection de liquide pour l’analyse en ligne par chromatographie en phase gazeuse et ses applications dans le domaine du raffinage : étude du comportement et apport des colonnes monolithiques courtes pour la chromatographie en phase gazeuse haute pression. Chimie analytique. Université de Lyon, 2016. Français. ⟨NNT : 2016LYSE1336⟩. ⟨tel-01474848⟩

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