Patent application number | Description | Published |
20090318637 | METHOD AND SYSTEM FOR DETERMINING CATALYST ACTIVITY - The present invention relates to a method for determining activity of a catalyst in a polymerisation process, said polymerisation process comprising the steps of feeding a catalyst and a diluent into a storage vessel, to form a concentrated settled catalyst, feeding said concentrated settled catalyst into a mixing vessel equipped with mixing means and feeding hydrocarbon diluent into said mixing vessel, to form a diluted catalyst slurry, feeding said diluted catalyst slurry into a polymerisation reactor via a volumetric pump, and feeding at least one monomer into said polymerisation reactor to form a polymer. The method is characterised in that density of the diluted catalyst slurry is measured between an outlet of the mixing vessel and the volumetric pump, the amount of catalyst fed into the polymerisation reactor is determined based on the measured density of the diluted catalyst slurry, and the amount of catalyst fed into the polymerisation reactor is compared to the amount of the polymer formed to determine the activity of the catalyst. The invention also relates to a system suitable for carrying out the method. | 12-24-2009 |
20090318638 | Slurry Polymerisation Process of Ethylene in the Presence of Low Amount of Scavenger - The invention discloses a metallocene catalysed slurry polymerisation process s of ethylene in the presence of a low concentration of scavenger. This allows improving the anti-sheeting of the reactor during the polymerisation process. | 12-24-2009 |
20110105701 | Dynamic Pressure Control in Double Loop Reactor - The present invention discloses a slurry loop reactor comprising at least two loop reactors connected in series and wherein the line connecting the two loops is subject to a dynamic pressure difference. | 05-05-2011 |
20110190459 | Process to Kill a Catalyzed Olefin Polymerization - Process to kill a continuous catalyzed olefin liquid phase polymerization in which the catalyst is a Ziegler-Natta or a metallocene catalyst, wherein, a predetermined amount of killing agent is injected into the reactor during at least twice the cycle time of the reactor. | 08-04-2011 |
20120242532 | METHOD FOR MONITORING THE LEVEL OF AN ETHYLENE POLYMERIZATION CATALYST SLURRY - The present invention relates to a method for monitoring the level of an ethylene polymerization catalyst slurry in a mud pot ( | 09-27-2012 |
20130125996 | Process for supplying catalyst to a polymerization reactor - The present invention relates to a method for feeding metallocene catalyst slurry to an olefin polymerization loop reactor ( | 05-23-2013 |
20130130890 | CATALYST SLURRY PREPARATION SYSTEM AND USE THEREOF - The present invention relates to the use of a catalyst preparation system for the preparation of a diluted catalyst slurry. In particular, the invention relates to a catalyst preparation system comprising a mixing vessel for mixing a particulate catalyst and a liquid hydrocarbon diluent. According to the invention, diluted catalyst slurry is prepared in a mixing vessel comprising a rotatable axial impeller system comprising at least two double-bladed hubs. The invention also relates to a process for preparing diluted catalyst slurry for use in the preparation of a particulate polyethylene product in a loop reactor with the catalyst preparation system as described herein. | 05-23-2013 |
20130130891 | PRESSURE CONTROL OF THE CATALYST MIXING VESSEL - The present invention relates to a process for preparing catalyst slurry in a catalyst slurry preparation system and supplying catalyst slurry to an ethylene polymerization loop reactor wherein an accurate control of the pressure within said catalyst slurry preparation system is provided. More particularly, the present invention provides a method for preparing a catalyst slurry and supplying said catalyst slurry to an ethylene polymerization loop reactor, said catalyst slurry comprising solid catalyst and a liquid hydrocarbon diluent, wherein said method comprises the steps of:
| 05-23-2013 |
20130131288 | METHOD FOR PRODUCING POLYETHYLENE - The present invention relates to a method for consecutively producing at least two different polyethylene resins in one slurry loop reactor, comprising producing a first polyethylene resin in the presence of a Ziegler-Natta and/or a Chromium catalyst, and consecutively producing a second polyethylene resin in the presence of a metallocene catalyst, characterized in that the ratio of the melt flow index of the first produced polyethylene resin to the melt flow index of the second produced polyethylene resin is at least 0.3. | 05-23-2013 |
20130231446 | Dynamic Pressure Control in Double Loop Reactor - The present invention discloses a slurry loop reactor comprising at least two loop reactors connected in series and wherein the line connecting the two loops is subject to a dynamic pressure difference. | 09-05-2013 |