Heavy oil hydrocracking process with multimetallic liquid catalyst in slurry bed

A heavy oil hydrocracking process using a multimetallic liquid catalyst in a suspension bed in a slurry-bed hydrocracking reactor under normal pressure and also using an online fixed-bed hydrotreating reactor, said process comprising the steps of:

• (a) providing a fully mixed and heated feed of heavy oil mixed with catalyst and hydrogen to the bottom of a slurry-bed hydrocracking reactor;
• (b) sending effluent out of the top of said slurry-bed reactor to a high-temperature and high-pressure separation system whereby the effluent is separated into vapor flow and liquid flow;
• (c) material flow in the vapor phase coming from said high-temperature/high-pressure separation system is sent to an online fixed-bed hydrotreating reactor while material flow in the liquid phase from said high-temperature/high-pressure separation system is sent to a low-pressure separation system;
• (d) material flow in the vapor phase coming from the low-pressure separation system is also directed into the online fixed-bed hydrotreating reactor;
• (e) material flow into the online fixed-bed hydrotreating reactor is hydrogenated and treated;
• (f) effluent from the online fixed-bed hydrotreating reactor is sent to a final product separation system comprising a vacuum distillation tower for separation and to obtain products;
• and,
• (g) vacuum gas oil fractionated out of the vacuum distillation tower is returned at least partially to the slurry-bed hydrocracking reactor to be treated.