Recycle of unconverted hydrocracked residual to hydrocracker after removal of unstable polynuclear hydrocarbons

US4655903A · kind A · utility

Assignee

• Intevep, S.A. · VE

Inventors

• Georgette Rahbe · Carrizal, VE
• Roger Marzin · San Antonio de los Altos, VE
• Ivan Cavicchioli · Caracas, VE
• Julio Krasuk · Los Teques, VE

Key dates

• Filing date: May 20, 1985
• Grant date: Apr 7, 1987
• Expiry date: May 20, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G67/0445
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Hydrocracking and separating process for upgrading unconverted residuals so as to increase liquid yields while at the same time decrease fouling of the hydrocracking reactor upon recycling of the upgraded residual to the hydrocracker. The unconverted residual from the hydrocracking unit is treated in a separation stage with a light hydrocarbon solvent so as to remove the polynuclear hydrocarbons from the residual prior to recycling.