Double loop technology
First Claim
1. An apparatus for controlling the injection of catalyst slurry in a polymerization reactor wherein polyethylene is prepared, comprising one or more storage vessels for storing catalyst slurry consisting of solid catalyst in a hydrocarbon diluent, whereby each vessel is provided with means for transferring said catalyst slurry from said storage vessels to a mixing vessel, a mixing vessel, being connected with said storage vessels by means of said transferring means, for diluting said catalyst slurry to a suitable concentration, one or more conduits, connecting said mixing vessel to a polymerization reactor for transferring said diluted catalyst slurry from said mixing vessel to said reactor, whereby each conduit is provided with a pumping means for pumping said slurry to said reactor, and the dilution being adapted to the pumping means.
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Accused Products
Abstract
The present invention relates to an apparatus and process for polymerizing olefins. One embodiment comprises polymerizing at least one monomer in a first loop reactor in the presence of a catalyst to produce a first polyolefin fraction. A portion of the first polyolefin fraction is transferred to a second loop reactor, connected in series with the first loop reactor. The process further comprises polymerizing in the second loop reactor at least one monomer in the presence of a catalyst to produce a second polyolefin fraction in addition to the first polyolefin fraction. The combination of the first and second polyolefin fractions can produce a polymer resin fluff having bimodal molecular weight distribution.
118 Citations
23 Claims
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1. An apparatus for controlling the injection of catalyst slurry in a polymerization reactor wherein polyethylene is prepared, comprising
one or more storage vessels for storing catalyst slurry consisting of solid catalyst in a hydrocarbon diluent, whereby each vessel is provided with means for transferring said catalyst slurry from said storage vessels to a mixing vessel, a mixing vessel, being connected with said storage vessels by means of said transferring means, for diluting said catalyst slurry to a suitable concentration, one or more conduits, connecting said mixing vessel to a polymerization reactor for transferring said diluted catalyst slurry from said mixing vessel to said reactor, whereby each conduit is provided with a pumping means for pumping said slurry to said reactor, and the dilution being adapted to the pumping means.
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12. A method for controlling the injection of catalyst slurry in a polymerization reactor, wherein polyethylene is prepared, said catalyst consisting of solid catalyst in a hydrocarbon diluent, comprising the subsequent steps of:
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providing solid catalyst and a hydrocarbon diluent in one or more storage vessels such that a catalyst slurry is obtained in said vessel, transferring said catalyst slurry from said storage vessel to a mixing vessel wherein said catalyst slurry is diluted for obtaining a suitable concentration for use in a polymerization reaction, pumping said diluted catalyst slurry at a controlled flow rate from said mixing vessel to said polymerization reactor through one or more conduits, by means of a pumping means, provided in each of said conduits, and the dilution being adapted to the pumping means. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A process for the co-polymerization of ethylene monomer and an olefin co-monomer in a polymerization loop reactor comprising the steps of
feeding monomer, an olefin co-monomer, diluents and optionally hydrogen into the loop reactor, feeding at least one polymerization catalyst into the reactor, co-polymerizing said monomer and said co-monomer to produce a polymer slurry comprising essentially liquid diluent and solid olefin co-polymer particles, allowing said polymer slurry to settle into one or more settling legs connected to the reactor, and sequentially discharging the settled polymer slurry from said one or more settling legs out of the reactor, characterized in that said process further comprises the step of controlling the co-monomer/monomer ratio along the path of the reactor.
Specification