An in-line method for determining the residue content of an...

Details An in-line method for determining the residue content of an... An in-line method for determining the residue content of an...

G - Physics

01

N

G01N 21/35 (2006.01)

Patent

CA 2336540

An in-line spectrometric method for determining the distillation residue content in an opaque, dark-colored mixture containing an isocyanate and tar- like materials (residue) during the isocyanate production process. A probe capable of directing light at wavelenths of from 1050 to 2150 nm is inserted in a stream of the residue-containing mixture and light is transmitted through the stream. Light absorption data is collected and a near-infrared spectrum is generated. The residue content is then determined using a chemometric model. Knowledge of the residue content makes it possible to control and optimize the distillation process.

On décrit un procédé en ligne qui permet de déterminer par spectrométrie la teneur en résidus de distillation dans un mélange opaque de couleur sombre contenant un isocyanate et des matières goudronneuses (résidu) pendant le processus de production de l'isocyanate. Une sonde pouvant diriger la lumière à des longueurs d'onde comprises entre 1050 et 2150 nm est insérée dans un courant du mélange et la lumière est transmise à travers ce courant. Des données d'absorption de la lumière sont recueillies et un spectre en proche infrarouge est généré. La teneur en résidus est ensuite déterminée au moyen d'un modèle chimiométrique et sa connaissance permet de régler et d'optimiser le processus de distillation.

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