Desulphurisation

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 27/04 (2006.01)

Patent

CA 2500403

Propane and/or butanes are separated from a hydrocarbon feedstock contaminated with alkyl mercaptans by fractional distillation at such a pressure that the separated overheads stream containing said propane and/or butanes is at a temperature in the range 50 to 100~C. Sufficient oxygen is introduced into the hydrocarbon feedstock to oxidise the mercaptans therein and the resultant mixture is subjected to the fractional distillation in a column including at least one bed of a catalyst capable, under the prevailing conditions, of oxidising the mercaptans to higher boiling point sulphur compounds. These higher boiling point sulphur compounds are separated as part of the liquid phase from the distillation.

La présente invention permet de séparer du propane et/ou des butanes d'une charge d'hydrocarbures contaminée par des alkyl-mercaptans, par une distillation fractionnée à une pression telle que la fraction de tête séparée contenant le propane et/ou les butanes précités se trouve à une température comprise entre 50 et 100 ·C. On introduit suffisamment d'oxygène dans la charge d'hydrocarbures pour oxyder les mercaptans qui sont présents et on soumet le mélange obtenu à la distillation fractionnée dans une colonne comprenant au moins un lit de catalyseur capable, dans les conditions existantes, d'oxyder les mercaptans en des composés soufrés à point d'ébullition élevé. Lesdits composés soufrés à point d'ébullition élevé sont séparés en tant que fraction de la phase liquide obtenue par la distillation.

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