Fluidized catalytic cracking process and apparatus

US6149875A · kind A · utility

Assignee

• Indian Oil Corporation Limited · IN

Inventors

• Marri Rama Rao · Faridabad, IN
• Vutukuru Lakshmi Narasimha Murthy · Bengaluru, IN
• Sanjeev Singh · San Francisco, US
• Asit Kumar Das · Faridabad, IN
• Sobhan Ghosh · Faridabad, IN
• Debasis Bhattacharyya · Faridabad, IN
• Satish Makhija · Barwala, IN
• Sukumar Mandal · Faridabad, IN

Key dates

• Filing date: Dec 23, 1998
• Grant date: Nov 21, 2000
• Expiry date: Dec 23, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G11/05
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A fluidized catalytic cracking apparatus includes a riser containing a regenerated catalyst and adsorbant, and has a first inlet for introduction of high velocity steam, a second inlet for introduction of a feed stream containing heavy residual fractions with high concentrations of conradson coke, metals including vanadium and nickel, and additional poisons including nitrogen, a third inlet for introduction of an adsorbent, and a fourth inlet disposed above the third inlet means for introduction of a regenerated catalyst, the adsorbent having a particle size which is larger than that of the regenerated catalyst. A stripper is provided into which the riser extends for causing separation of a hydrocarbon fraction from spent catalyst and adsorbent, and a separator is connected to the stripper and has a base, an inlet at the base for introduction of steam in the upward direction so as to provide a transport velocity in the upward direction for the spent catalyst and cause a separation of the particles of the spent catalyst from the adsorbent in use. A regenerator is connected to the separator and has an outlet and is in flow communication with the fourth inlet for introduction of the r…