Patent ID: 7005485

Claim:
A process comprising: introducing at least one monomer, at least one catalyst, and at least one diluent into an olefin polymerization zone under polymerization conditions, wherein the at least one monomer is polymerized to form at least one polyolefin, and wherein the olefin polymerization zone comprises a slurry polymerization reactor that is a loop reactor or a stirred tank reactor; withdrawing an effluent from the olefin polymerization zone, and introducing the effluent into a separation zone in which the effluent is separated into a polyolefin lean stream and a polyolefin rich stream; passing the polyolefin rich stream to an agglomerating zone, in which polyolefin is agglomerated; introducing at least one catalyst deactivating agent into the olefin polymerization zone for a selected time in an amount effective to substantially deactivate at least part of the at least one catalyst, whereby the polymerization of the at least one monomer is substantially stopped or the rate of polymerization is substantially slowed; and restarting polymerization by introducing into the olefin polymerization zone at least one catalyst.