Fluid catalytic cracking (FCC) process for manufacturing propylene and ethylene in increased yield

US8685232B2 · kind B2 · utility

Assignee

• RELIANCE INDUSTRIES LIMITED · IN

Inventors

• Sukumar Mandal · Faridabad, IN
• Asit Kumar Das · Faridabad, IN
• Ashwani Yadav
• Manoj Yadav · Greater Noida, IN
• Akhilesh Kumar Bhatnagar · Faridabad, IN
• Rajeshwar Dongara · Vadodara, IN
• Veera Venkata Satya Bhaskara Sita Rama Murthy Katravulapalli · Hyderabad, IN

Key dates

• Filing date: Dec 8, 2009
• Grant date: Apr 1, 2014
• Expiry date: Apr 8, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G2400/20
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Manufacture of propylene and ethylene in a FCC unit. Each FCC riser comprises an acceleration zone, a lift stream feed nozzle, a main hydrocarbon stock feed nozzle, and an olefinic naphtha feed nozzle. Mixed FCC catalyst comprising at least 2 percent by weight pentasil zeolite and at least 10 percent by weight Y-zeolite is injected at the bottom of each FCC riser. Olefinic naptha is injected through the olefinic feed nozzle, main hydrocarbon stock is injected through the main hydrocarbon stock feed nozzle and lift stream is injected through the lift stream feed nozzle. Lift stream comprises olefinic C4 hydrocarbon stream and optionally steam and/or a fuel gas. Olefinic C4 hydrocarbon steam is cracked in the acceleration zone at 600 to 800° C., 0.8 to 5 kg/cm2 (gauge) pressure, WHSV 0.2 to 100 hr up 1 and vapour residence time 0.2 to 5 seconds.