Naphtha upgrading process

Details Naphtha upgrading process Naphtha upgrading process

C - Chemistry, Metallurgy

10

G

C10G 69/02 (2006.01) C10G 69/08 (2006.01)

Patent

CA 2219137

Low sulfur gasoline of relatively high octane number is produced from a thermally cracked sulfur-containing naphtha such as coker naphtha, by hydrodesulfurization followed by treatment over an acidic catalyst, preferably a zeolite such as ZSM-5 or zeolite beta with a hydrogenation component, preferably molybdenum. The treatment over the acidic catalyst in the second step restores the octane loss which takes place as a result of the hydrogenative treatment and results in a low sulfur gasoline product.

On produit de l'essence pauvre en soufre et à indice d'octane relativement élevé, à partir de naphta contenant du soufre et obtenu par craquage thermique, tel que du naphta de cokéfaction, par une hydrodésulfuration que l'on fait suivre d'un traitement sur catalyseur acide, de préférence une zéolite telle que ZSM-5 ou une zéolite bêta, avec un constituant d'hydrogénation, de préférence du molybdène. Dans la seconde étape, le traitement sur le catalyseur acide reconstitue la perte d'octane, cette reconstitution se produisant par suite du traitement d'hydrogénation, et donne une essence pauvre en soufre.

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