Improved hds process using selected naphtha streams

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 45/04 (2006.01) C10G 45/60 (2006.01)

Patent

CA 2524353

A process for concurrently fractionating and hydrotreating a full range naphtha stream. The full boiling range naphtha stream (1) is subjected to simultaneous hydrodesulfurization and splitting into a light boiling range naphtha (3) and a heavy boiling range naphtha (19), which have been treated to convert mercaptans in the fractions to H2S, which is separated with and separated from the light naphtha which is further hydrodesulfurized by contacting the light boiling range naphtha with hydrogen (2) in countercurrent flow in a fixed bed of hydrodesulfurization catalyst to remove recombinant mercaptans which are formed by the reverse reaction of H2S with olefins in the naphtha during the initial hydrodesulfurization wherein the improvement comprises fractionating said portion of light boiling range naphtha to remove a lighter fraction thereof from said countercurrent flow reactor before contact of said lighter fraction with said fixed catalyst, because the lighter fraction is substantially free of mercaptans and is not benefitted by further treatment.

L'invention concerne un procédé de fractionnement et d'hydrotraitement simultanés d'un courant de naphta de gamme complète. Le courant de naphta de gamme complète est soumis à une hydrodésulfuration et une coupure simultanées et transformé en un naphta de plage d'ébullition légère et un naphta de plage d'ébullition lourde, dont le traitement est destiné à convertir les mercaptans présents dans les fractions en H¿2?S, lequel est séparé du naphta léger qui est hydrodésulfuré de nouveau par placement du naphta de plage d'ébullition légère au contact d'hydrogène, dans un écoulement à contre-courant, sur un lit fixe d'un catalyseur d'hydrodésulfuration, afin de retirer les mercaptans recombinants formés par la réaction inverse de H¿2?S avec des oléfines présentes dans le naphta lors de l'opération initiale d'hydrodésulfuration. L'amélioration consiste à fractionner la partie de naphta de plage d'ébullition légère pour en retirer une fraction plus légère du réacteur d'écoulement à contre-courant avant que ladite fraction plus légère n'entre en contact avec le catalyseur à lit fixe, car cette fraction plus légère est sensiblement exempte de mercaptans et n'a pas subi d'autre traitement.

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