The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2007
Filed:
May. 21, 2004
Richard C. Stell, Houston, TX (US);
Arthur R. Di Nicolantonio, Seabrook, TX (US);
James M. Frye, Houston, TX (US);
Subramanian Annamalai, Singapore, SG;
Nicholas G. Vidonic, Seabrook, TX (US);
Richard C. Stell, Houston, TX (US);
Arthur R. Di Nicolantonio, Seabrook, TX (US);
James M. Frye, Houston, TX (US);
Subramanian Annamalai, Singapore, SG;
Nicholas G. Vidonic, Seabrook, TX (US);
ExxonMobil Chemical Patents, Inc., Houston, TX (US);
Abstract
A process for decoking of a process that cracks hydrocarbon feedstock containing resid and coke precursors, wherein steam is added to the feedstock to form a mixture which is thereafter separated into a vapor phase and a liquid phase by flashing in a flash/separation vessel, separating and cracking the vapor phase, and recovering cracked product. Coking of internal surfaces in and proximally downstream of the vessel is controlled by interrupting the feed flow, purging the vessel with steam, introducing an air/steam mixture to at least partially combust the coke, and resuming the feed flow when sufficient coke has been removed. An apparatus for carrying out the process is also provided.