A method for the online analysis of a vapour phase process...

G - Physics – 01 – N

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G01N 21/35 (2006.01)

Patent

CA 2690078

A method for the on-line analysis of a process stream, which process stream is a feedstream to or an exit stream from a steam reformer, which process stream has a temperature of at least 2000C, the components of which process stream are in the vapour phase, which method comprises: (a) taking a slipstream from the process stream; (b) cooling the slipstream to a temperature above its dew point; (c) analysing the cooled slipstream by near infra-red (NIR) spectroscopy to obtain a spectrum characterising NIR-absorbing components of the process stream; and (d) correlating the spectrum obtained to established calibration models from NIR spectroscopy using chemometric techniques to determine the concentration of, and/or to determine the partial pressure of one or more of the NIR-absorbing components of the process stream.

L'invention concerne un procédé pour l'analyse en ligne d'un flux de traitement. Le flux de traitement est un flux d'alimentation entrant ou sortant d'un reformeur à vapeur, sa température est d'au moins 2000 °C et ses composants sont en phase vapeur. Ledit procédé comprend : (a) le prélèvement d'un flux de perte provenant du flux de traitement; (b) le refroidissement du flux de perte jusqu'à une température supérieure à son point de rosée; (c) l'analyse du flux de perte refroidi par spectroscopie proche infrarouge (NIR) pour obtenir un spectre caractérisant les composants d'absorption NIR du flux de traitement; et (d) la corrélation entre le spectre obtenu et des modèles étalons établis par spectroscopie NIR au moyen de techniques chimiométriques pour déterminer la concentration et/ou la pression partielle d'un ou de plusieurs composants d'absorption NIR contenus dans le flux de traitement.

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