Patent ID: 6596823
Filing Date: 2003-07-22
Classification: B01J,C08F

Abstract:
Continuous process for manufacturing a polyolefin resin of improved homogeneity, according to which:(a) in a polymerization reactor (R) comprising a diluent (D), an olefin is polymerized continuously in the presence of a catalyst to produce a suspension (S) comprising the said diluent (D) and polyolefin particles, (b) a portion of the suspension (S) is taken from the reactor (R), (c) the suspension taken is transferred into a hydrocyclone separator in which a flow (F) comprising diluent (D) and polyolefin particles, on the one hand, and a concentrated suspension (CS) of polyolefin particles, on the other hand, are formed and separated, (d) the flow (F) is taken from the hydrocyclone separator and recycled into the polymerization reactor (R), into step (a), (e) the concentrated suspension (CS) is taken from the hydrocyclone separator and introduced into a subsequent polymerization reactor (Râ€²), fed with olefin to continue the polymerization and to produce a suspension (Sâ€²) comprising the diluent (D) and polyolefin particles, (f) a portion of the suspension (Sâ€²) is taken from the subsequent polymerization reactor (Râ€²), (g) the suspension taken is transferred to a hydrocyclone separator in which a flow (Fâ€²) comprising diluent (D) and polyolefin particles, on the one hand, and a concentrated suspension (CSâ€²) of polyolefin particles, on the other hand, are formed and separated, (h) the flow (Fâ€²) is taken from the hydrocyclone separator and recycled into the polymerization reactor (R), into step (a), (i) the suspension (CSâ€²) is taken from the hydrocyclone separator and the polyolefin particles are separated from the suspension (CSâ€²).