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. 01, 2003
Filed:
May. 24, 2001
Eric Cassisa, Lavera, FR;
Jean-Claude Chinh, St Mitre Les Remparts, FR;
Stephen Kevin Lee, London, GB;
BP Chemicals Limited, London, GB;
Abstract
A process for controlling a continuous fluidised bed reactor (co-)polymerisation process which comprises (1) withdrawing from the reactor a hot recycle stream containing a principal monomer and at least one other unreacted reactant, (2) cooling part or all of the recycle stream withdrawn from the reactor, and (3) recycling part or all of the cooled recycle stream containing the principal monomer and the unreacted reactant(s) through the polymerisation zone in the reactor in the presence of a polymerisation catalyst under reactive conditions, wherein the controlling process consists in maintaining at least one of the reactant gradients (Gri) within a range of values outside which sheeting or unstable operations would otherwise occur.