Patent application number | Description | Published |
20090246092 | Flushing in a Multiple Loop Reactor - The present invention discloses multiple loop reactor wherein one of the settling legs transferring polymer product from one loop to a further loop can be taken out of service or re-opened without interfering with the operation of said multiple loop reactor. | 10-01-2009 |
20090326170 | Process for Improving the Polymerization of Ethylene and One or More Optional Comonomer(s) in a Polymerization Loop Reactor - The present invention relates to a process for improving the polymerization of ethylene and one or more optional co-monomer(s) in a polymerization loop reactor characterized in that said process comprises the step of controlling the hydrogen/monomer ratio along the path of the reactor by multiple, spatially separated, feeding of hydrogen along the path of the loop reactor. In particular, the invention provides a process for controlling, and preferably narrowing, the molecular weight distribution of the produced polymer particles. In another aspect, the invention relates to a polymerization loop reactor suitable for the polymerization process of ethylene and an optional olefin co-monomer, wherein the molecular weight distribution of the produced ethylene polymer can be controlled. | 12-31-2009 |
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 |
20110015331 | Additivising Carbon Black to Polymer Powder - The present invention concerns an improved method for introducing free carbon black additive into a polymer powder or fluff, and in particular into polyethylene powder. | 01-20-2011 |
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 |
20120157638 | POLYMERIZATION PROCESS WITH IMPROVED POLYMER HOMOGENEITY - The present invention relates to a process for the polymerization of an olefin monomer. In particular, the present invention relates to a process for the polymerization of an olefin monomer and one or more optional comonomers in presence of a polymerization catalyst and hydrogen, said process being characterized by an improved control of the hydrogen concentration in the polymerization reactor. In addition, the present invention provides for an improved hydrogen feeding system to a polymerization reactor. Furthermore, the present invention provides for a polymerization reactor comprising such an improved hydrogen feeding system. | 06-21-2012 |
20120252989 | METHOD FOR REPLACING COMPATIBLE ETHYLENE POLYMERIZATION CATALYSTS - The present invention relates to a method for optimizing the sequential feeding of at least two ethylene polymerization catalysts to an ethylene polymerization reactor, comprising:
| 10-04-2012 |
20120264891 | METHOD FOR PRODUCING A CATALYST SLURRY BLEND - The present invention relates to a method for producing a catalyst slurry blend suitable for polymerizing ethylene in an ethylene polymerization loop reactor for obtaining an at least trimodal polyethylene product, comprising the steps of:
| 10-18-2012 |
20120271012 | METHOD FOR NEUTRALIZING POLYMERIZATION CATALYST - The present invention relates to a process for cleaning a catalyst slurry preparation system and/or a catalyst preparation system. More particularly, the invention relates to a cleaning process for a catalyst preparation system and/or for a catalyst slurry preparation system, wherein an aqueous catalyst inactivation agent is used to rinse the systems, or any parts thereof. The catalysts used in the present invention may be chromium, Ziegler-Natta or metallocene catalysts. | 10-25-2012 |
20120309910 | METHOD FOR REPLACING INCOMPATIBLE ETHYLENE POLYMERIZATION CATALYSTS - The present invention relates to a method for optimizing the sequential use of at least two ethylene polymerization catalysts to an ethylene polymerization loop reactor, comprising:
| 12-06-2012 |
20130095001 | Process for Improving the Polymerization of Ethylene and One or More Optional Comonomer(s) in a Polymerization Loop Reactor - The present invention relates to a process for improving the polymerization of ethylene and one or more optional co-monomer(s) in a polymerization loop reactor characterized in that said process comprises the step of controlling the hydrogen/monomer ratio along the path of the reactor by multiple, spatially separated, feeding of hydrogen along the path of the loop reactor. In particular, the invention provides a process for controlling, and preferably narrowing, the molecular weight distribution of the produced polymer particles. In another aspect, the invention relates to a polymerization loop reactor suitable for the polymerization process of ethylene and an optional olefin co-monomer, wherein the molecular weight distribution of the produced ethylene polymer can be controlled. | 04-18-2013 |
20130118591 | Catalyst metering device - The invention relates to a catalyst metering device with a valve formed of an iron-based alloy steel hardened to a Rockwell hardness C of at least 60. The device can be used for metering of a catalyst for an ethylene polymerization reaction. The invention further relates to ethylene polymerization wherein the catalyst is metered in a catalyst metering device with a iron-based alloy steel hardened valve, as well as to a ethylene polymerization reactor comprising such a catalyst metering device. | 05-16-2013 |
20130118592 | Method of feeding catalyst - The present invention relates to a method of continuously feeding catalyst slurry into an olefin polymerization reactor comprising the steps of: a) continuously feeding catalyst slurry into the reactor through a catalyst feeding line and then through a valve connected to the wall of the reactor, wherein said valve comprises a piston device comprising an actuator and a hollow casing, wherein said piston is connected to the actuator and wherein said piston is arranged in the hollow casing; and b) closing said valve by moving the piston through at least part of said valve towards the reactor and at least until the wall of the reactor, upon at least partial blockage of said valve. | 05-16-2013 |
20130123441 | Process for preparing polyolefins - The present invention relates to a process of preparing a polyolefin in a loop reactor by introducing anti-fouling agent through a sleeve provided around at least part of the shaft of the pump. Also, the invention relates to the use of anti-fouling agent to prevent or reduce fouling by feeding the anti-fouling agent against the impeller of the pump upon introduction to the loop reactor. | 05-16-2013 |
20130123442 | PUMP FOR LOOP REACTOR - The present invention relates the use of a pump in a loop reactor for the production of polyethylene, as well as a reactor comprising such pump and methods for producing polyolefin by means of such reactor. The pump according to the invention is characterized in that it is an axial flow impeller circulation pump, wherein the impeller comprises 6 blades and wherein the pump is fixed on a spring supported frame. Use of the pump according to the present invention allows for preparation of homogeneous polyethylene products that meet high quality standards from the complicated ethylene polymerization mixtures while at the same time being produced with low energy consumption. | 05-16-2013 |
20130123443 | Process for preparing polyolefins and use of antifouling agents therein - The present invention relates to a process of preparing a polyethylene in a loop reactor in the presence of antifouling agent comprising the steps of:
| 05-16-2013 |
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 |
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 |
20130131287 | Process for preparing polyolefins - The present invention relates to a process of preparing a polyolefin in a loop reactor by introducing anti-fouling agent in by-pass pipes. Also, the invention relates to the use of anti-fouling agent to prevent blockage by feeding the anti-fouling agent into the by-pass pipes of the loop reactor. | 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 |
20130287634 | System and Reactor For Improved Polymer Homogeneity - The present invention relates to a process for the polymerization of an olefin monomer. In particular, the present invention relates to a process for the polymerization of an olefin monomer and one or more optional comonomers in presence of a polymerization catalyst and hydrogen, said process being characterized by an improved control of the hydrogen concentration in the polymerization reactor. In addition, the present invention provides for an improved hydrogen feeding system to a polymerization reactor. Furthermore, the present invention provides for a polymerization reactor comprising such an improved hydrogen feeding system. | 10-31-2013 |
20130338314 | PROCESS FOR PREPARING ZIEGLER-NATTA PRODUCED POLYETHYLENE BLENDS - A process for preparing a multimodal polyethylene product with at least two different polyethylene resins can include producing a first polyethylene resin in the presence of a Ziegler-Natta catalyst in a reactor. The Ziegler-Natta catalyst used for the production of the first polyethylene resin has an average particle size (D50) of at most 15 μm. The HLMI of the first polyethylene resin is between 0.01 and 5 g/10 min. The process can include separately producing a second polyethylene resin in the presence of a Ziegler-Natta catalyst in a reactor. The MI | 12-19-2013 |
20130345360 | PROCESS FOR PREPARING POLYETHYLENE BLEND COMPRISING METALLOCENE PRODUCED RESINS AND CHROMIUM PRODUCED RESINS - A process for preparing a homogeneous polyethylene product can include producing a first polyethylene resin in the presence of a metallocene catalyst in a reactor. The first polyethylene resin can have a density of from 0.942 to 0.970 g/cm | 12-26-2013 |
20130345361 | PROCESS FOR PREPARING POLYOLEFIN BLENDS IN A DEVICE FOR CONTINUOUSLY PHYSICALLY MELTING AND BLENDING THE BLENDS - A process for preparing a polyolefin product can include providing a first high molecular weight (HMW) polyolefin resin having an HLMI of between 0.01 and 5 g/10 min, and separately providing a second low molecular weight (LMW) polyolefin resin having an MI | 12-26-2013 |
20140058039 | PROCESS FOR PREPARING POLYETHYLENE BLEND COMPRISING METALLOCENE PRODUCED RESINS AND ZIEGLER-NATTA PRODUCED RESINS - A process for preparing a homogeneous polyethylene product can include producing a first polyethylene resin in the presence of a metallocene catalyst in a reactor. The first polyethylene resin can have a density of from 0.940 to 0.970 g/cm | 02-27-2014 |
20140255260 | Catalyst Metering Device - The invention relates to a catalyst metering device with a valve formed of an iron-based alloy steel hardened to a Rockwell hardness C of at least 60. The device can be used for metering of a catalyst for an ethylene polymerization reaction. The invention further relates to ethylene polymerization wherein the catalyst is metered in a catalyst metering device with a iron-based alloy steel hardened valve, as well as to a ethylene polymerization reactor comprising such a catalyst metering device. | 09-11-2014 |
20150065666 | Process for Preparing Polyolefins - The present invention relates to a process of preparing a polyolefin in a loop reactor by introducing anti-fouling agent in by-pass pipes. Also, the invention relates to the use of anti-fouling agent to prevent blockage by feeding the anti-fouling agent into the by-pass pipes of the loop reactor. | 03-05-2015 |
20150073105 | Pump for Loop Reactor - The present invention relates the use of a pump in a loop reactor for the production of polyethylene, as well as a reactor comprising such pump and methods for producing polyolefin by means of such reactor. The pump according to the invention is characterized in that it is an axial flow impeller circulation pump, wherein the impeller comprises 6 blades and wherein the pump is fixed on a spring supported frame. Use of the pump according to the present invention allows for preparation of homogeneous polyethylene products that meet high quality standards from the complicated ethylene polymerization mixtures while at the same time being produced with low energy consumption. | 03-12-2015 |