| Patent application number | Description | Published |
|---|
| 20090036616 | Slurry loop reactors - An apparatus defined as a set of loop reactors suitable for the polymerization process of a monomer, preferably ethylene and optionally an olefin comonomer, comprising for each of said reactors: a plurality of interconnected pipes P defining a flow path for a polymer slurry, said slurry consisting essentially of ethylene, optionally a comonomer, a polymerization catalyst, liquid diluent and solid olefin polymer particles, means for feeding monomer, optionally a co-monomer, diluent and optionally hydrogen in the reactor, means for feeding a polymerization catalyst in the reactor, a pump suitable for maintaining the polymer slurry in circulation in such reactor, one or more settling legs connected to the pipes P of such reactor for settling of polymer slurry, one or more control valves connected to the outlet of such settling legs, and one or more flash lines for discharging settled polymer slurry out of the reactor characterized in that each of said loop reactors comprises a three-or-more-way valve defining three-or-more ends, one end A being positioned at the outlet of said one or more control valves. A method to switch from series to parallel configuration a set of loop reactors. The use of the apparatus to switch polymerization reactors from parallel to series configuration and vice-versa. | 02-05-2009 |
| 20090048393 | Additivising polymer powders - The invention provides an apparatus for introducing additives onto a polymer powder. | 02-19-2009 |
| 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 |
| 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 |
| 20100267904 | Method and Device for Optimising Catalyst Supply to a Polymerisation Reactor - Methods for supplying a catalyst to an ethylene slurry loop polymerization reactor and polymers formed therefrom are described herein. The method generally includes preparing a catalyst slurry in a preparation vessel wherein the slurry includes a hydrocarbon diluent liquid which contains a Ziegler-Natta catalyst; supplying the catalyst slurry from the preparation vessel to a buffer vessel; withdrawing the catalyst slurry from the buffer vessel and supplying the catalyst slurry to a slurry loop polymerization reactor in which ethylene is polymerized; mixing a co-catalyst with the Ziegler Natta catalyst in the slurry prior to the supplying of the catalyst slurry to the slurry loop polymerization reactor; and controlling the transfer of catalyst slurry from the preparation vessel to the buffer vessel and the withdrawal of catalyst slurry from the buffer vessel to maintain the level of catalyst slurry in the buffer vessel substantially constant relative to the level of catalyst slurry in the preparation vessel. | 10-21-2010 |
| 20100273961 | Slurry Loop Reactors - Reactor systems suitable for the polymerization of an olefin monomer including first and second loop reactors effective for the polymerization of an olefin monomer and polymers formed therefrom are described herein. Each of said reactors generally include at least one settling leg connected to said reactor for receiving polymer slurry from said reactor and sequentially discharging settled polymer from said at least one settling leg to withdraw said polymer slurry from said reactor; a transfer line extending from the outlet at least one first reactor settling leg to an inlet for said second loop reactor; a flash line extending from said transfer line at a valve location intermediate said first reactor settling leg and said inlet for said second reactor; and a multiway valve located in said transfer line at said valve location intermediate said first reactor settling leg and the inlet to said second reactor and having one position in which said multiway valve provides for the flow of polymer slurry through said transfer line to said second reactor and another position in which said first reactor settling leg is connected to said flash line for the discharge of polymer slurry from said first reactor settling leg to said flash line and removal of said polymer from said polymer system. | 10-28-2010 |
| 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 |
| 20110124828 | Loop Reactor Suitable for Olefin Polymerization with Improved Product Removal Means - The present invention relates to a loop reactor suitable for olefin polymerization process comprising:
| 05-26-2011 |
| 20110144270 | ADDITIVISING POLYMER POWDERS - The invention provides an apparatus for introducing additives onto a polymer powder. | 06-16-2011 |
| 20110166302 | Method for Transforming a Single Reactor Line - The present invention discloses a method for transforming a single reactor line into a double reactor line wherein the existing single reactor line is equipped with a flash tank for separating the solid polymer product from the flash vapour and wherein the vapour is sent to a system of at least two separating columns allowing the separation of its constituents into monomer, diluent and comonomer. | 07-07-2011 |
