Process for the deep desulfurization of heavy pyrolysis...

C - Chemistry – Metallurgy – 10 – G

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C10G 45/02 (2006.01) C10G 45/32 (2006.01) C10G 65/06 (2006.01)

Patent

CA 2698461

A process for the deep desulfurization of a heavy pyrolysis gasoline to very low levels of organic sulfur, e.g., 30 ppmv or less, with minimal octane number loss through aromatics saturation. The deep desulfurization is accomplished by contacting the heavy pyrolysis gasoline feedstock, partially in liquid and partially in gaseous phase, with a hydrogen treat gas containing a minimum H2S level in the presence of a hydrogenation catalyst in a one or two reactor system operated in trickle flow, using a low temperature, moderate pressure operating condition.

L'invention concerne un procédé permettant la désulfurisation profonde d'une essence lourde de pyrolyse jusqu'à obtenir des taux très faibles de soufre organique, par ex. 30 ppmv ou moins, avec une perte d'indice d'octane minimale grâce à la saturation des composés aromatiques. La désulfurisation profonde est réalisée par mise en contact de la charge d'essence lourde de pyrolyse, en partie en phase liquide et en partie en phase gazeuse, avec un gaz de traitement hydrogéné contenant un taux de H2S minimal en présence d'un catalyseur d'hydrogénation dans un système à un ou deux réacteurs fonctionnant en écoulement ruisselant, en utilisant des conditions de service de faible température et de pression modérée.

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