On-line determination of wax crystallization temperature of...

C - Chemistry – Metallurgy – 10 – G

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C10G 73/34 (2006.01) C10G 73/06 (2006.01) G01N 21/49 (2006.01)

Patent

CA 2461162

A laser beam reflected by wax crystals is used in determining the wax crystallization temperature of a hot dewaxing solvent upstream of solvent chillers. This is automatically achieved by an on-line method from a remote control point, in which a slipstream of solvent is passed through an attached solvent loop into a sample chamber in the loop, without being exposed to ambient conditions. As the sample is cooled, the beam reflections are detected and indicate the wax to crystallization temperature. Corrective measures can then be taken to prevent fouling of the chillers, if need be.

L'invention concerne l'utilisation d'un faisceau laser réfléchi par des cristaux de paraffine, aux fins de détermination de la température de cristallisation de la paraffine d'un flux amont de solvant de déparaffinage à chaud de cristallisoirs de solvant. On obtient un tel résultat par mise en oeuvre automatique d'un procédé en direct exécuté à partir d'un point de commande à distance, ce procédé consistant à faire passer un flux glissant de solvant à travers un circuit de solvant fixé, dans une chambre d'échantillon dans le circuit, sans exposition aux conditions ambiantes. Pendant le refroidissement de l'échantillon, les réflexions du faisceau sont détectées et représentent la paraffine à la température de cristallisation. Des mesures de correction peuvent être ensuite prises, de manière à empêcher un encrassement des cristallisoirs, si nécessaire.

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