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:
Dec. 03, 2013
Filed:
Feb. 17, 2011
Eric J. Markel, Kingwood, TX (US);
Robert O. Hagerty, Wyckoff, NJ (US);
Richard B. Pannell, Kingwood, TX (US);
Michael E. Sieloff, Houston, TX (US);
Jerome Holveck, Lillebonne, FR;
Eric J. Markel, Kingwood, TX (US);
Robert O. Hagerty, Wyckoff, NJ (US);
Richard B. Pannell, Kingwood, TX (US);
Michael E. Sieloff, Houston, TX (US);
Jerome Holveck, Lillebonne, FR;
Univation Technologies, LLC, Houston, TX (US);
Abstract
Methods for shutting down and restarting polymerization in a gas phase polymerization reactor are provided. The method can include introducing a polymerization neutralizer to the reactor in an amount sufficient to stop polymerization therein. The method can also include stopping recovery of a polymer product from the reactor and stopping introduction of a catalyst feed and a reactor feed to the reactor. The method can also include adjusting a pressure within the reactor from an operating pressure to an idling pressure. The method can also include adjusting a superficial velocity of a cycle fluid through the reactor from an operating superficial velocity to an idling superficial velocity. The method can also include maintaining the reactor in an idled state for a period of time.