Apparatus and process for extracting sulfur compounds from a...

C - Chemistry – Metallurgy – 10 – G

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C10G 19/02 (2006.01) B01D 11/04 (2006.01) C10G 19/08 (2006.01) C10G 53/12 (2006.01)

Patent

CA 2567701

Disclosed is an apparatus and process for extracting sulfur compounds from a hydrocarbon stream. A prewash section for converting hydrogen sulfide to a sulfide salt by reaction with an alkali such as caustic communicates with an extractor section disposed directly above the prewash section for converting mercaptans to mercaptides by reaction with alkali. Hydrocarbon product exits the extractor section through a coalescer that prevents alkali from exiting with the hydrocarbon product stream. A prewash section for converting hydrogen sulfide to sodium sulfide by reaction with an alkali such as caustic prepares the hydrocarbon stream for extraction. Spent alkali is continuously withdrawn and regenerated alkali is continuously added to the prewash section.

L'invention concerne un appareil et un procédé d'extraction de composés de soufre à partir d'un flux d'hydrocarbures. Une partie de prélavage destinée à convertir le sulfure d'hydrogène en un sel de sulfure par réaction avec un alcali, tel qu'une substance caustique, communique avec une partie d'extraction disposée directement au-dessus de la partie de prélavage afin de convertir des mercaptanes en mercaptides par réaction avec l'alcali. Un produit hydrocarboné ressort de la partie d'extraction à travers un coalesceur qui empêche l'alcali de ressortir avec le flux de produit hydrocarboné. La partie de prélavage destinée à convertir le sulfure d'hydrogène en sulfure de sodium par réaction avec un alcali, tel qu'une substance caustique, prépare le flux d'hydrocarbures pour l'extraction. L'alcali utilisé est retiré en continu et l'alcali régénéré est ajouté en continu à la partie de prélavage.

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