Saudi Arabian Oil Company

Jgc Catalysts & Chemicals Ltd.

Japan Cooperation Center Petroleum

Ali H Al-Abdul'al

Omer Refa Koseoglu

Adnan Al-Hajji

Vinod Ramaseshan

Masaru Ushio

Koji Nakano

Ryuzo Kuroda

Ali Mahmood Al-Somali

Takashi Kameoka

Mishaal Al-Thukair

Kouji Nakano

Yuuichi Takamori

In a hydrocracking process, the product from the first stage reactor passes through a steam stripper to remove hydrogen, HS, NH, light gases (C-C), naphtha and diesel products. The stripper bottoms are separated from hydrogen, HS, NH, light gases (C-C), naphtha, and diesel products and treated in a second stage reactor. The effluent stream from the second stage reactor, along with the stream of separated hydrogen, HS, NH, light gases (C-C), naphtha, and diesel products, are passed to a separation stage for separating petroleum fractions. Preferably, the effluent stream from the first stage reactor is passed through a steam generator prior to the steam stripping step. In an alternate embodiment, the effluent stream from the first stage reactor is passed through a vapor/liquid separator stripper vessel prior to the steam stripping step.

Hydrocracking process with interstage steam stripping

Multiple grades of lube oil base feedstock are produced within a two-stage hydrocracking unit. Effluent from a first hydrocracking zone is sent to a separation zone, which includes multiple separation vessels, and a heavy liquid stream enters one cell of a dual cell fractionator charge heater and is flashed in the distillation zone of a divided wall fractionation column. A portion of the bottom stream from one side of the divided wall column is sent to the second hydrocracking zone. Feed to a second cell of the dual cell fractionation column is derived from the effluent of this second hydrocracking zone. A different lube oil base feedstocks is derived from each of the cells of the dual cell fractionation column.

Two stage hydrocracking process and apparatus for multiple grade lube oil base feedstock production

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Qatif, Saudi Arabia

Ali H Al-Abdul'al