Class / Patent application number | Description | Number of patent applications / Date published |
526074000 | Utilizing material during polymerization to prevent or remove reactor buildup, e.g., fouling, clogging, etc. | 7 |
20090318639 | Method for Ologomerization and/or Poymerization with Flushing of Equipment and Piping - The present invention relates to a method for oligomerization or polymerization of ethylene and/or alpha-olefins utilizing reactor equipment and other equipment wherein starting material comprising monomer(s), catalyst, cocatalyst and solvent is transferred to the reactor equipment via first piping, and product material comprising oligomer and/or polymer, non-reacted monomer(s), catalyst, cocatalyst and solvent is discharged from the reactor equipment via second piping, characterized in that the first piping, second piping, reactor equipment and/or other equipment are flushed with a product fraction obtained by said or a respective previous method prior to and/or after that oligomerization or polymerization method. | 12-24-2009 |
20100280196 | PREPOLYMERIZED CATALYST FOR OLEFIN POLYMERIZATION, METHOD OF PRODUCING THIS PREPOLYMERIZED CATALYST AND METHOD OF PRODUCING OLEFIN POLYMER - A method of producing a prepolymerized catalyst for olefin polymerization comprising a fine powder removal step of removing fine particles from olefin-prepolymerized catalyst particles for olefin polymerization. The prepolymerized catalyst having a low fine particle content is applicable suitably to the field of continuous polymerization of olefins. | 11-04-2010 |
20110172375 | Processes And Apparatus For Continuous Solution Polymerization - Described herein in one embodiment is a plant for the continuous solution polymerization of one or more monomers in a solvent, e.g., a hydrocarbon solvent. In one aspect, the plant comprises a high pressure pump and at least one heat exchanger downstream of the pump. In another aspect a feed is cooled by three heat exchangers which are refrigerated by means of a common three stage compressor. In another aspect, the plant comprises a primary reactor and a secondary reactor arranged to operate in parallel, in which the ratio of volume of the primary reactor to the secondary reactor is in the range of 60:40 to 95:5. In another aspect, a method of defouling a heat exchanger is provided in which the level of liquid refrigerant in the heat exchanger is temporarily lowered. | 07-14-2011 |
20110172376 | PROCESS FOR THE PRODUCTION OF AN ALPHA-OLEFIN POLYMER - The present invention is directed to a process for the production of an alpha-olefin polymer, which process comprises feeding of at least one alpha-olefin to a mechanically stirred bed gas phase reactor containing particles of the alpha-olefin polymer and polymerizing the alpha-olefin in the presence of a catalyst based on a titanium compound and a magnesium compound, an aluminum-alkyl compound and optionally an organosilane donor, in which process an amount of less than 100 ppm of at least one compound selected from the group of ethoxylated amines, fatty acid esters, diethanol amides, ethoxylated alcohols, alkylsulfonates and alkylphosphates is present during the polymerization. | 07-14-2011 |
20110196112 | Methods for Cleaning the Distributor Plate in a Fluidized Bed Reactor System - A method for cleaning a distributor plate in a fluidized bed polymerization reactor system according to one embodiment includes, in a first mode, operating with about a normal, baseline value of superficial gas velocity in a fluidized bed polymerization reactor system having a reactor vessel, a recycle line, and a distributor plate in the reactor vessel near an inlet of the reactor vessel. In a second mode, the superficial gas velocity is increased above the baseline value of the first mode to a level sufficient to raise the temperature of the cycle gas at the inlet above an average temperature of the cycle gas at the inlet in the first mode, and to a level sufficient to dislodge foulant from holes in the distributor plate. | 08-11-2011 |
20120046426 | OLEFIN POLYMERIZATION PROCESS WITH REDUCED FOULING - The invention concerns methods for polymerization of olefins comprising contacting one or more monomers selected from ethylene and α-olefins with a supported single site catalyst in the presence of one or more magnesium alkyl compounds wherein said magnesium alkyl is present during the major portion of said polymerization. | 02-23-2012 |
20130296507 | REACTOR OPERABILITY IN A GAS PHASE POLYMERIZATION PROCESS - Olefin polymerization is carried out with a single site polymerization catalyst in the presence of a continuity additive. The continuity additive is a cocktail containing one or more dialkanolamide derived from a fatty acid, an oil soluble sulfonic acid and a dialkanolamine. | 11-07-2013 |