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:
Apr. 03, 2012
Filed:
May. 15, 2009
Riccardo Rinaldi, Mantova, IT;
Antonio Mazzucco, Ferrara, IT;
Enrico Balestra, Ferrara, IT;
Giuseppe Penzo, Mantova, IT;
Maurizio Dorini, Porto Mantovano, IT;
Gabriele Mei, Ferrara, IT;
Riccardo Rinaldi, Mantova, IT;
Antonio Mazzucco, Ferrara, IT;
Enrico Balestra, Ferrara, IT;
Giuseppe Penzo, Mantova, IT;
Maurizio Dorini, Porto Mantovano, IT;
Gabriele Mei, Ferrara, IT;
Basell Poliolefine Italia s.r.l., Milan, IT;
Abstract
A process for the polymerization of olefins carried out in a gas-phase reactor having interconnected polymerization zones, where the growing polymer particles flow upward through a first polymerization zone (riser) under fast fluidization or transport conditions, leave said riser and enter a second polymerization zone (downcomer) through which they flow downward under the action of gravity, leave said downcomer and are reintroduced into the riser, a gas recycle stream being withdrawn from said first polymerization zone, subjected to cooling below its dew point and then returned to said first polymerization zone, the process being characterized in that said gas recycle stream is cooled at a temperature Tc ranging from 0.05° C. to 3° C. below its dew point.