Patent application number | Description | Published |
20090143546 | Double Loop Technology - A method for controlling the injection of catalyst slurry in a polymerization reactor is described herein. The method includes the preparation of polyethylene with a solid catalyst and a hydrocarbon diluents. The method includes 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 membrane pump provided in each of said conduits, and the membrane pump is controllable as a function of reactant concentration within the polymerization reactor. | 06-04-2009 |
20090183789 | Optimisation of Flow in Transfer Line - The present system discloses a transfer system devised in order to produce optimal flow from the first to the second loop reactor, by connecting the transfer lines to a by-pass line and by separating the connecting points of the transfer lines into the by-pass line by at least 70 cm. | 07-23-2009 |
20100120999 | Olefin Polymerization Process with Optimized Product Discharge - The present invention relates to a polymerization process for producing olefin polymers in a loop reactor comprising the steps on introducing into the loop reactor one or more olefin reactants, polymerization catalysts and diluents, and while circulating said reactants, catalysts and diluents, polymerizing said one or more olefin reactants to produce a polymer slurry comprising essentially liquid diluent and solid olefin polymer particles, said process further comprising one or more cycles of: (a) allowing said polymer slurry to settle in one or more setting legs connected to said reactor, and (b) discharging from a setting leg a predetermined volume of polymer slurry substantially equal to the volume of polymer slurry settled in said settling leg since its previous discharge. | 05-13-2010 |
20100324738 | Method for Optimising the Transition from One Grade to Another - The present invention relates to the polymerisation of olefin monomers in a slurry loop reactor and to a model for determining and optimising the changes in operating conditions that need to be applied when changing from one polymer grade to another. | 12-23-2010 |
20100331500 | REDUCED BLOCKAGE WHEN TRANSFERRING POLYMER PRODUCT FROM ONE REACTOR TO ANOTHER - This invention is related to the field of olefin polymerisation in double loop reactors and especially to the polymerisation of olefins with very active catalyst systems. It discloses a method for reducing blockage when transferring polymer product from the first loop to the second loop of a double loop reactor. | 12-30-2010 |
20100332433 | Predictive Model for Density and Melt Index of Polymer Leaving Loop Reactor - The present invention discloses a method for predicting the melt index and density of the polymer in terms of the operating conditions in the reactor and vice-versa, to select the operating conditions necessary to obtain the desired product specifications. | 12-30-2010 |
20130345374 | Double Loop Technology - A method for the copolymerization of ethylene and a C | 12-26-2013 |
20140299208 | Double Loop Technology - 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. | 10-09-2014 |