Patent ID: 6413412
Filing Date: 2002-07-02
Classification: C10G

Abstract:
A process for producing diesel oils of superior quality and low solidifying point from inferior quality fraction oils, comprising the following steps combined in series:(1) hydrorefining the feedstock over a hydrorefining catalyst in the presence of hydrogen under the following conditions: reaction temperature: 300-420Â° C.; hydrogen partial pressure: 2.0-8.0Mpa H2/oil volume ratio: 200-1000; and liquid hourly space velocity: 0.5-5.0 hâˆ’1; (2) hydroupgrading the effluent from step (1) over a hydroupgrading catalyst in the presence of hydrogen under the following conditions: reaction temperature: 320-430Â° C.; hydrogen partial pressure: 2.0-8.0Mpa H2/oil volume ratio: 200-1000; and liquid hourly space velocity: 0.5-5.0 hâˆ’1; and (3) hydrodewaxing the effluent from step (2) over a hydrodewaxing catalyst in the presence of hydrogen under the following conditions: reaction temperature: 300-430Â° C.; hydrogen partial pressure: 2.0-8.0Mpa H2/oil volume ratio: 200-1000; and liquid hourly space velocity: 0.2-5.0 hâˆ’1, and wherein the final diesel oils have a cetane number of not less than 45.