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:
Sep. 11, 2001
Filed:
Dec. 06, 1999
Applicant:
Inventor:
Lance L. Jacobsen, Lake Zurich, IL (US);
Assignee:
UOP LLC, Des Plaines, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F 2/34 ;
U.S. Cl.
CPC ...
C08F 2/34 ;
Abstract
In the operation of a gas phase polymerization reactor, a significant amount of production time and material can be lost during the transition from initial process conditions for the production of one product to the desired process conditions for the production of a second product. The present invention recognizes the synergy between the use of a membrane separation zone selective for the removal of hydrogen from the reactor effluent and the operation of the polymerization reactor during the transition period to significantly reduce the transition time and substantially reduce the production of off-specification product during the transition period.