초록 ▼

A process which comprises recracking a cracked naphtha feed containing up to about 60 percent, suitably from about 20 to about 40 percent olefins, over a crystalline aluminosilicate zeolite catalyst to further crack the naphtha and saturate at least about 50 percent of the olefins, preferably from a

A process which comprises recracking a cracked naphtha feed containing up to about 60 percent, suitably from about 20 to about 40 percent olefins, over a crystalline aluminosilicate zeolite catalyst to further crack the naphtha and saturate at least about 50 percent of the olefins, preferably from about 90 percent to about 100 percent of the olefins, based on the weight of said cracked naphtha feed. In a preferred combination a gas oil is catalytically cracked in a first stage to produce a cat cracked naphtha product of high olefin content, and an intermediate boiling component thereof is recracked as a feed in a second stage over a zeolite catalyst to saturate the olefins, and hydrodenitrogenate and hydrodesulfurize said cat cracked naphtha. The recracked cat cracked naphtha is then hydrotreated at low to mild severities and then catalytically reformed (hydroformed) to produce high octane gasoline.

대표청구항 ▼

A process for the production of a high octane gasoline comprising cracking a sulfur-bearing hydrocarbon feed in a first cracking zone over a cracking catalyst at conditions sufficient to obtain a cat cracked naphtha product containing from about 10 percent to about 60 percent olefins, based on the w

A process for the production of a high octane gasoline comprising cracking a sulfur-bearing hydrocarbon feed in a first cracking zone over a cracking catalyst at conditions sufficient to obtain a cat cracked naphtha product containing from about 10 percent to about 60 percent olefins, based on the weight of said product, withdrawing said cat cracked naphtha as a product from said first cracking zone, splitting said product into components inclusive of a fraction having a low end boiling point ranging from about 150°F. to about 250°F. and a high end boiling point ranging from about 350°F. to about 450°F., recracking said cat cracked naphtha fraction, without dilution with other hydrocarbons, over a crystalline aluminosilicate zeolite catalyst in a second cracking zone to desulfurize said feed, and saturate at least about 50 percent of said olefins, based on the weight of said cat cracked naphtha, hydrofining the product of said second cracking zone over a hydrogenation catalyst at hydrofining conditions in a hydrofining zone sufficient to form a feed suitable for reforming over a sulfur-sensitive noble metal reforming catalyst, and then reforming said hydrofined, recracked fraction over a sulfur sensitive noble metal reforming catalyst at reforming conditions to form a high octane gasoline.