Method for the catalytic purification of light hydrocarbons

Details Method for the catalytic purification of light hydrocarbons Method for the catalytic purification of light hydrocarbons

C - Chemistry, Metallurgy

10

G

C10G 27/00 (2006.01) C10G 29/06 (2006.01)

Patent

CA 2548885

The invention relates to a method for the purification of light hydrocarbons having a cut point of between 20 and 250 ·C and containing sulphur and/or nitrogen compounds which are refractory to standard hydrotreating. The inventive method is characterised in that it comprises the following steps, namely: (a) a step involving the oxidative polymerisation of compounds containing a -X-CH= group in a 5- or 6-membered hydrocarbon ring, wherein X denotes a sulphur or nitrogen atom, in the presence of at least one oxidising agent selected from metal cations; (b) a step involving the separation of the formed polymers and the oxidising agent from the light hydrocarbons; and (c) a step involving the oxidation of the metal cation, said steps being performed in the above order. Moreover, each of the aforementioned steps can be combined with at least the step following same.

L'invention concerne un procédé de purification des hydrocarbures légers de point de coupe compris entre 20 et 250~C, contenant des composés soufrés et/ ou azotés réfractaires aux hydrotraitements usuels, caractérisé en ce qu'il comprend (a) une étape de polymérisation oxydative des composés comprenant un groupement -X-CH= dans un cycle hydrocarboné de 5 ou 6 chaînons, où X représente un atome de soufre ou d'azote, en présence d'au moins un agent oxydant choisi parmi les cations métalliques, (b) une étape de séparation des polymères formés et de l'agent oxydant d'avec les hydrocarbures légers, et (c) une étape d'oxydation du cation métallique, ces étapes étant réalisées dans cet ordre, chacune de ces étapes pouvant être combinée avec au moins l'étape suivante.

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