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:
Jun. 03, 2008
Filed:
Dec. 20, 2004
Ronald Birkhoff, Spring, TX (US);
Clive Griffiths, Wilmslow, GB;
Kiran Shah, Sugar Land, TX (US);
Anand Subramanian, Sugar Land, TX (US);
Ronald Birkhoff, Spring, TX (US);
Clive Griffiths, Wilmslow, GB;
Kiran Shah, Sugar Land, TX (US);
Anand Subramanian, Sugar Land, TX (US);
Kellogg Brown & Root LLC, Houston, TX (US);
Abstract
A process for the selective hydrogenation of alpha-methyl-styrene (AMS) to cumene in a two catalyst system is disclosed. A crude cumene feed stream containing up to 10% AMS by weight is supplied to the first reaction zoneand mixed with hydrogen in a first catalyst bedcontaining a nickel catalyst, converting from 70 to 95 percent of the AMS to cumene. Cumene and remaining AMS are separated from hydrogen in a liquid take off tray. The first reaction zoneeffluent is supplied to a second reaction zone, where the effluent and hydrogen gas are mixed in a second catalyst bedcontaining a noble-metal catalyst to substantially convert any remaining AMS to cumene. Cumene is collected, separated from the hydrogen, and can be resupplied to the hydrogenation reactor, or supplied as feed to a phenol synthesis loop.