Process for the generation of a low dew-point oxygen-free...

C - Chemistry – Metallurgy – 21 – D

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C21D 1/74 (2006.01) C21D 1/76 (2006.01)

Patent

CA 2232118

A process for the generation of a protective nitrogen-based atmosphere for the performance of heat treatments of metal articles in three phases, including an initial phase in which a gaseous hydrocarbon feed and an oxidant containing oxygen react on a first catalyst to form a reaction product, a second phase in which the reaction product is added to nitrogen contaminated by the presence of oxygen and a third phase in which the reaction product is conveyed to a second catalyst to form a low dew-point gaseous mixture as a protective atmosphere.

Une méthode de production d'atmosphère protectrice à base d'azote pour la réalisation de traitements thermiques de pièces métalliques, en trois étapes, comprenant une étape initiale au cours de laquelle une charge d'hydrocarbure gazeux et un oxydant contenant de l'oxygène réagissent sur un premier catalyseur pour former un produit, une deuxième étape au cours de laquelle ce produit est additionné à de l'azote contaminé par de l'oxygène et une troisième étape au cours de laquelle le produit de réaction est transporté vers un deuxième catalyseur pour former un mélange gazeux à bas point de rosée devant servir d'atmosphère protectrice.

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