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7598312 |
Process for preparing a halogenated polymer and device for its implementation
A process for preparing a halogenated polymer in a medium comprising liquid or supercritical carbon dioxide, comprising a step involving the radical polymerization of at least one halogenated...
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7582710 |
Degassing process
An improved process for the polymerization of olefin monomer selected from (a) ethylene, (b) propylene, (c) mixtures of ethylene and propylene and (d) mixtures of (a), (b) or (c) with one or more...
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7550116 |
Method for producing polyesters and a disk ring reactor for the method
The invention relates to a method and a device for producing polyesters such as for example polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate from...
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7531606 |
Method for operating a gas phase polymerization reactor
Disclosed herein is a method of operating a polymerization reactor for a polymerization reaction comprising modifying a recycle gas composition to increase the heat capacity of the recycle gas...
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7524904 |
Process and apparatus for separating polymer solids, hydrocarbon fluids, and purge gas
A process and apparatus for separating polymer solids, hydrocarbon fluids, and purge gas in an intermediate pressure zone and a purge zone. The purge gas in the purge zone is used to remove...
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7507780 |
Polymerization process
The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of a Ziegler-Natta-type...
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7497896 |
Method of treating a gas mixture comprising propane and propylene
Methods for treating a gas mixture of at least propylene and propane, in order to separate the propylene from the propane. The gas mixture is brought into contact with a membrane enables the...
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7482411 |
Gas-phase olefin polymerization process
A continuous process for the olefin polymerization in a fluidized bed reactor, said process comprising continuously passing a gaseous stream comprising one or more α-olefin monomers through the...
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7482410 |
Processes for producing high density polyethylene
Processes for reducing the ultra high molecular weight polymeric material content of a high density polyethylene produced with a bis-triarylsilyl chromate catalyst system are provided. Processes...
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7442751 |
Method of producing water-soluble nonturbid copolymers of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer
Method of producing vinyllactam copolymers by free-radical polymerization of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer in an organic solvent in the presence of...
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7388059 |
Ethylene polymer, catalyst for producing thereof and method for producing thereof
A method for producing an ethylene polymer which comprises continuously polymerizing ethylene alone or copolymerizing ethylene and a C 3 -C 8 α-olefin by multistage polymerization in a plurality...
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7332549 |
Process for the (co-)polymerisation of ethylene in the gas phase
The present invention relates to a process for improving the start up of polymerization or copolymerization of ethylene in a gas phase reactor, preferably a fluidized bed gas phase reactor.
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7276564 |
Process for the (co-)polymerization of ethylene in the gas phase
The present invention relates to a process for improving the start up of polymerization or copolymerization of ethylene in a gas phase reactor, preferably a fluidised bed gas phase reactor.
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7241859 |
Process for treating a polyolefin discharged from an olefin polymerization reactor
Process for treating polyolefin discharged from an olefin polymerization reactor which comprises steps of discharging from a polymerisation reactor a slurry comprising polyolefin and diluent;...
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7163989 |
Processes and apparatus for continuous solution polymerization
This invention relates to processes and plants for continuous solution polymerization. Such plan and process include a pressure source, a polymerization reactor, downstream of said pressure source,...
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7157530 |
Catalyst system for controlled polymerization
Disclosed is a process for the removal and recycle of a supported transition metal catalyst complex from a polymerization reaction medium comprising the steps separating the supported transition...
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7141630 |
Methods of feed purification for olefin polymerization
A polymerization process is provided. For example, a polymerization process is described, including contacting olefin monomers with a supported metallocene catalyst to polymerize the olefin...
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7129316 |
Process for the manufacture of polyester via hydrogenation treatment of recycled diol
An improved process for recycling unspent diol removed from a polyester manufacturing process wherein the diol is captured, hydrogenated, and recycled so that the final polyester product has...
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7122607 |
Polymerization process
The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of catalyst system or...
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7098301 |
High pressure filter method of separating polymer solids and unreacted monomer
The present invention provides a method of separating unreacted monomer from a polymerization process effluent stream. The polymerization process effluent stream has at least the following...
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7087685 |
Process and system for removing heavies from diluent recycled to a slurry polymerization reactor
A recycling and recovery system and process comprising a flash gas separator that receives a slurry comprising liquid medium and solid polymer particles. The flash gas separator separates the...
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7071283 |
Reactive rectification
The invention relates to a method for producing polycarbonate according to the method for the transesterification of molten mass whereby bis-(hydroxyaryl) compounds (bisphenols) and diaryl...
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7067597 |
Process of making polypropylene from intermediate grade propylene
This invention concerns using an intermediate grade propylene stream as feed to a polypropylene forming reaction system. The intermediate grade propylene stream is preferably recovered form the...
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7041750 |
Process and apparatus for making supported catalyst systems for olefin polymerization
A process to support a homogeneous catalyst on a porous solid support is performed in two separate zones. In the first zone the solid is contacted, under stirring, with an amount of a catalyst...
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7034090 |
Continuous slurry polymerization volatile removal
A process/apparatus is disclosed for continuously separating a liquid medium comprising diluent and unreacted monomers from a polymerization effluent comprising diluent, unreacted monomers and...
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7026433 |
Continuous bioreactor process for the preparation of polyester cyclic oligomers
A continuous process for the process for the enzyme-catalyzed preparation of cyclic ester oligomers from linear ester oligomers. The process may use a linear or recirculating reactor.
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7025938 |
Fluid recycle apparatus for fluidized bed polyolefin reactor
The partially condensed fluid recycle stream of a fluidized bed polyolefin reactor operating in the condensing mode is split into two portions by a stream splitter. In a preferred mode, the smaller...
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6979752 |
Continuous process for converting polytetramethylene ether diester to polytetramethylene ether glycol
A continuous process for converting by transesterification the diester of polytetramethylene ether (PTMEA) to the corresponding polytetramethylene ether glycol (PTMEG). The process is characterized...
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6979720 |
manufacture of certain cyclic ester oligomers
Enzymes which are capable of catalyzing esterifications and/or transesterifications such as selected lipases and esterases can, under specified conditions, convert certain lower linear oligomers of...
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6977283 |
Polymerization process
The present invention relates to a process for polymerizing monomer and comonomer(s) utilizing a bulky ligand transition metal metallocene-type catalyst or catalyst system, where the process is...
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6958376 |
Inlet distribution device for upflow polymerization reactors
A polymerization process and polymerization reactor are provided. For example, a polymerization process is described, including passing a feed stream including liquid and gas through a feed stream...
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6936666 |
Continuous gas-phase polymerization process
Continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or mixtures comprising ethylene or propene and C 3 -C 8...
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6927260 |
Optimization of heat removal in a gas-phase fluidized-bed process
A process for preparing polyethylene from “feed ethylene” comprises: a) a hydrogenation stage in which “feed ethylene” containing impurities or secondary components such as acetylene and...
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6911504 |
Apparatus and process for gas phase fluidized-bed polymerization
A process for the continuous gas-phase (co)polymerization of one or more olefins for which a rising stream of a gas mixture, comprising at least one olefin to be (co)polymerized, maintains polymer...
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6899852 |
Tubular polymerization reactors and polymers made therein
Tubular reactor apparatus and processes are provided for improved polymerization including using chain transfer agents and multiple monomer feeds spaced lengthwise along the tubular reactor...
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6897268 |
Fluidized bed polymerization apparatus and an olefin polymerization process
In a gas phase olefin polymerization process using a fluidized bed vessel, an apparatus is employed having a device for measuring temperature or temperature distribution on the external wall...
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6894131 |
Polymerization process using a metallocene catalyst system
Provided is a process for polymerizing olefins in the presence of a metallocene catalyst compound having at least one fluoride or fluorine containing leaving group. More particularly, the present...
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6891002 |
Process for producing polyolefin
A process for producing a polyolefin according to the present invention comprises (co) polymerizing one or two or more α-olefins in a vapor phase in a fluidized-bed reactor, wherein the...
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6891001 |
Process for the gas phase polymerization of olefins
A process for preparing and controlling the density of high density polyethylene in the gas phase comprising contacting ethylene or a mixture of ethylene and one or more alpha-olefins with a...
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6887954 |
Polymerization catalyst
The present invention is a process and an apparatus for the gas phase polymerization of olefin(s) using a fluidised-bed reactor ( 1 ) from which, at the top part, is withdrawn a recycling gas...
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6887953 |
Esterification process
A process that can be used for direct esterification of a dicarboxylic acid such as terephthalic acid with a glycol such as 1,3-propanediol. The process comprises (1) contacting, at an elevated...
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6884856 |
Polymerization control process
The present invention relates to a continuous process for controlling the gas-phase co-polymerisation of olefins in a fluidised bed reactor. The present invention further relates to a method for...
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6867269 |
Water-absorbent resin and production process therefor
The present invention provides such a production process that a low-cost water-absorbent resin having excellent quality can be obtained by reasonable steps in aqueous solution polymerization. The...
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6864332 |
Process for the gas phase polymerization and copolymerization of olefin monomers
A process for polymerizing monomers in the gas phase, in fluidized bed reactors is described, where unsaturated, gas phase monomers are fed into the reactors in the presence of a mixture of inert...
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6833415 |
Continuous slurry polymerization process and appparatus
A process/apparatus is disclosed for continuously separating a liquid medium comprising diluent and unreacted monomers from a polymerization effluent comprising diluent, unreacted monomers and...
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6831139 |
Method for manufacturing ethylene-vinyl acetate copolymer and apparatus for manufacturing the same
The present invention provides a method for manufacturing an ethylene-vinyl acetate copolymer (EVA) in a polymerization solution in a vessel. The polymerization solution includes ethylene, vinyl...
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6825288 |
Method of producing of vinyl chloride-based polymer
A method of producing a vinyl chloride-based polymer by suspension polymerization is provided, by which heat removal performed by a reflux condenser can be increased, but total heat removal...
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6818708 |
Method of polymerizing olefin
The process for polymerizing olefins uses a plurality of series-connected polymerization reactors in which at least one of second and subsequent reactors is a vapor-phase polymerization reactor...
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6818186 |
System for removing heavies from diluent recycled to a slurry polymerization reactor
A recycling and recovery system and process comprising a flash gas separator that receives a slurry comprising liquid medium and solid polymer particles. The flash gas separator separates the...
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6815512 |
Polyolefin production using condensing mode in fluidized beds, with liquid phase enrichment and bed injection
The partially condensed fluid recycle stream of a fluidized bed polyolefin reactor operating in the condensing mode is split into two portions by a stream splitter. In a preferred mode, the smaller...
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