Patent Number: 8,796,402

Title: Process for start-up of a polymerisation reaction fluidised bed

Abstract: Process for polymerization and, in particular, to a process for start-up of a gas phase fluidized bed polymerization reaction involving one or more monomers using a catalyst in a reactor. The process includes providing a start-up bed of particles in the reactor in the presence of the one or more monomers but in the absence of the catalyst, introducing at T.sub.0 catalyst to the reactor to initiate reaction and start-up polymer production at a time T.sub.i, T.sub.i being between 1 and 6 hours after T.sub.0. The value of X.sub.i is less than a threshold value, wherein: X.sub.i=Cumulative production in the time period T.sub.0 to T.sub.i/(Cumulative catalyst injection the time period T.sub.0 to T.sub.i*P.sub.iC.sub.2=), where P.sub.iC.sub.2= is the ethylene partial pressure in the reactor at the time T.sub.i, subsequently stopping the injection of catalyst, and taking a corrective action to address the low value of X.sub.i.

Inventors: Gondorf; Andreas Harald (Neuss, DE), Laille; Jose Andre (Salon de Provence, FR), Lalanne-Magne; Claudine Viviane (Saint Mitre les Remparts, FR)

Assignee: Ineos Commercial Services UK Limited

International Classification: C08F 4/00 (20060101); C08F 4/44 (20060101); C08F 210/00 (20060101)

Expiration Date: 8/05/12018