Process for cracking an olefin-rich hydrocarbon feedstock

US7375257B2 · kind B2 · utility

Assignee

• Total Petrochemicals Research Feluy · BE

Inventors

• Jean-Pierre Dath · Ath, BE
• Walter Vermeiren · Houthalen-Helchteren, BE

Key dates

• Filing date: Oct 3, 2001
• Grant date: May 20, 2008
• Expiry date: May 22, 2022

Classification

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

Abstract

A process for cracking an olefin containing hydrocarbon feedstock which is selective towards light olefins in the effluent, the process comprising passing a hydrocarbon feedstock containing one or more olefins through a moving bed reactor containing a crystalline silicate catalyst selected from an MFI-type crystalline silicate having a silicon/aluminium atomic ratio of at least 180 and an MEL-type crystalline silicate having a silicon/aluminium atomic ration of from 150 to 800 which has been subjected to a steaming step, at an inlet temperature of from 500 to 600° C., at an olefin partial pressure of from 0.1 to 2 bars and the feedstock being passed over the catalyst at an LHSV of from 5 to 30 h−1 to produce an effluent with an olefin content of lower molecular weight than that of the feedstock, intermittently removing a first fraction of the catalyst from the moving bed reactor, regenerating the first fraction of the catalyst in a regenerator and intermittently feeding into the moving bed reactor a second fraction of the catalyst which has been regenerated in the regenerator, the catalyst regeneration rate being controlled whereby the propylene purity is maintained constant at a v…