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7629421 |
Monomer recovery by returning column overhead liquid to the reactor
A polyolefin production system, comprising a polymerization reactor (such as a polyethylene loop slurry reactor) and a fractionation system that receives reactor effluent processed in a...
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7622536 |
Apparatus and method for the production of polyethylene and ethylene copolymers
The invention relates to an apparatus for the high pressure polymerisation of ethylene which comprises a high pressure reactor; a conduit for the supply of ethylene to the reactor, the conduit...
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7615596 |
Multiple component feed methods and systems
Multiple components are selected, conveyed, and measured in a polymerization system. A control system adjusts the system variables to the desired values. Portions of the components can be fed to a...
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7601787 |
Ethylene polymerization process
A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95...
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7601786 |
Tubular reactor with coaxial cylinders and process using this reactor
A process of preparing a liquid reaction product in a column reactor, which reactor comprises a space between coaxial tubular interior surfaces comprising an inner interior surface and an outer...
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7592410 |
Polyethylene resin with narrow particle size distribution
The present invention relates to a polyethylene resin comprising A) a first ethylene homo- or copolymer fraction, and B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a...
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7588735 |
Production of polyethylene
A process of producing polyethylene, the process comprising copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 8 carbon atoms in the presence of a chromium-based catalyst...
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7585923 |
Polymerization monitoring and method of selecting leading indicators
Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in...
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7582709 |
Process and apparatus for manufacturing ethylene polymers and copolymers
The invention relates to a process for the manufacture of ethylene polymers and copolymers in which ethylene is compressed in a primary compressor at a throughput of at least 55 tonnes/hour, mixed...
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7575724 |
Continuous slurry polymerization apparatus
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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7572866 |
Slurry phase polymerisation process
A process comprising polymerizing an olefin monomer optionally together with an olefin comonomer in the presence of a polymerization catalyst in a diluent in a loop reactor which comprises at least...
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7563413 |
Compressor for high pressure polymerization
The invention provides a compressor for use as a secondary compressor for an ethylene polymerization tubular reactor comprising a motor and at least two compressor frames, at least one of the...
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7553916 |
Loop reactor with varying diameter for olefin polymerization
Process for polymerizing at least one olefinic monomer in a loop reactor at from 20 to 150° C., but below the melting point of the polymer to be formed, and a pressure of from 5 to 100 bar, where...
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7547750 |
Apparatus and method for removing polymer solids from slurry loop reactor
An apparatus and method for removing polymer solids from a slurry loop reactor. A discharge conduit having a longitudinal axis and an end section for removing polymer solids from the slurry loop...
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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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7524903 |
Process and apparatus for the polymerization of propylene
A process for preparing heterophasic propylene copolymers by polymerizing propylene in the presence of a polymerization catalyst and hydrogen as a molecular weight regulator, the process comprising...
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7524897 |
Film with high impact strength
A film with a broad molecular weight distribution, excellent impact strength and a high dart drop value or moderate dart drop value accompanied by good optical property consisting of a bimodal...
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7517947 |
Polymer transfer within a polymerization system
A method for transferring polymer within a polymerization system, comprising continuously withdrawing the polymer from the reactor and conveying the polymer from a reactor to a flash chamber via a...
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7498396 |
Mid-range vinylidene content polyisobutylene polymer product produced by liquid phase polymerization process
A mid-range vinylidene content PIB polymer composition made by a liquid phase polymerization process conducted in a loop reactor at a temperature of at least 60° F. using a BF 3 /methanol catalyst...
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7473744 |
Process for the production of polymers using a loop reactor
A polymer can be prepared using a loop reactor and process including feeding a process stream through the loop reactor and maintaining the loop reactor at a steady state by controlling a flow of...
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7473743 |
Surface finish of reactor
This invention discloses the use in the production of a polyolefin of a slurry loop reactor wherein all internal parts in contact with the slurry are polished first by a mechanical process to a...
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7470767 |
Preparation of ultrapure polymeric articles
Ultrapure olefinic polymeric articles of manufacture can be prepared by a process comprising: providing olefinic polymeric material containing impurities, subjecting the olefinic polymeric material...
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7470757 |
Olefin polymerization process in the presence of an anti-fouling agent
An olefin polymerisation process carried out in the presence of an anti-fouling agent and a chromium-type catalyst or Ziegler Natta catalyst; characterised in that the anti-fouling agent comprises...
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7470756 |
Propylene random copolymer and process for the production thereof
The present invention relates to a process for preparing a propylene random copolymer comprising polymerisation of propylene with a comonomer, said comonomer being ethylene or an α-olefin...
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7465771 |
Process for producing radical polymer and microapparatus for chemical reaction
The present invention provides a method for producing a radical polymer having controlled molecular weight distribution or a narrow molecular weight distribution profile, comprising feeding a...
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7459506 |
Segmented agitator reactor
The present invention relates to an apparatus for carrying out chemical and physical processes, wherein flowable substances are mixed together, comprising a vertical, cylindrical vessel with inlets...
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7446167 |
Catalyst deactivation agents and methods for use of same
A method of deactivating a polymerization catalyst system comprising contacting the catalyst system with a catalyst deactivation agent wherein the catalyst system comprises an alkyl aluminum...
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7446156 |
Swirling fluidized-bed reactors for olefin polymerization
A method for polymerizing olefins in a fluidized-bed reactor is provided. The method involves introducing a fluid into the fluidized-bed reactor at an angle and amount sufficient to induce one or...
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7442748 |
Continuous polymerization reactor
A process for the continuous polymerization of monomer, the process comprising (a) adding monomer and catalyst to an annulus within an annular reactor to form a polymerization medium within the...
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7442743 |
Propylene polymer resin with improved properties
The present invention relates to a process for the production of a propylene polymer in a multistage polymerization process comprising the polymerisation of propylene in the presence of a catalyst...
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7435784 |
Method of ethylene polymerization for producing products having various properties with high productivity and a tubular reactor used therefor
A method for continuous ethylene polymerization under high pressure using a polymerization reaction zone comprises a primary reaction zone and a secondary reaction zone wherein the secondary...
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7411026 |
Polymers of ethylene and, optionally, copolymerizable esters, films using such polymers and stretch hood packaging processes using such films
Polymers comprising units derived from ethylene, said polymer having: a) a Melt Index of from 0.05 to 20 g/10 min. as determined by ASTM-1238 Condition E; b) at least 10 per 1000 C-atoms of short...
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7402636 |
Method and apparatus for decreasing polymer deposition
The disclosure provides a slurry polymerization system and method to decrease polymer deposition on reactor surfaces using an oxygenate such as alcohol ( 16 ) supplied to the polymerization medium...
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7402635 |
Process for preparing polyethylene
Disclosed is process for producing polyethylene using a slurry loop reactor. The process includes using a mathematical model to predict a plurality of process control parameters based on the...
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7393510 |
Decontamination of process streams
A method for removing contaminants from a process stream that includes the use of reticulated material to filter the process stream in a vessel located upstream of a process unit. The reticulated...
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7378472 |
Injection moulding polymer
The use of a multimodal polyethylene composition comprising as comonomers to ethylene at least two C 4-12 alpha olefins in injection molding.
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7365136 |
High melt strength polypropylene
The present invention concerns a high melt strength propylene polymer or copolymer suitable for manufacturing foams and thermoformed product exhibiting a melt strength of at least 3 g and...
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7329712 |
Swell control in slurry loop reactor
The present invention discloses a method for controlling the onset and development of swelling in a slurry loop reactor by progressively diluting the reactor, the amount of dilution being driven by...
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7323528 |
Block copolymers containing functional groups
The present invention provides a block copolymer of styrene and an unsaturated cyclic anhydride, such as maleic anhydride, a process for making a copolymer using controlled free radical...
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7319125 |
Supercritical polymerization process and polymers produced therefrom
This invention relates to a process to produce propylene polymers comprising contacting a metallocene catalyst compound and an activator in a reaction medium comprising propylene, from 0 to 30...
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7282544 |
Olefin polymerisation process in the presence of an anti-fouling agent
A propylene polymerisation process carried out in the presence of an anti-fouling agent; characterised in that the anti-fouling agent comprises an anti-fouling polymer containing:
(1) one or...
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7279535 |
Method for the continuous production of polymers made of vinyl compounds by substance and/or solvent polymerization
Production of vinyl polymers by the polymerization of vinyl monomers in a planetary gear extruder.
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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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7268194 |
Continuous slurry polymerization process and apparatus
A process of converting a loop reactor into multiple loop reactors comprising starting with a loop reactor comprising at least 8 vertical legs, at least two non-vertical conversion runs, each...
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7265189 |
Filtration, flow distribution and catalytic method for process streams
A method for removing contaminants from an process stream that includes the use of reticulated material to filter the process stream. The reticulated material also facilitate process stream flow...
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7204962 |
Production apparatus for polybutylene terephthalate
Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid...
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7135541 |
Polyester process using a pipe reactor
There are disclosed polyester processes using a pipe reactor and corresponding apparatuses. In particular, there are disclosed processes and corresponding apparatuses including an esterification...
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7129304 |
Dimine metal complexes, methods of synthesis, and methods of using in oligomerization and polymerization
Processes to polymerize or oligomerize olefins by contacting olefins with α-diimine metal complexes. In particular, alpha olefins can be produced in high selectivity by contacting ethylene with...
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7122606 |
Olefin polymerization process
A process for polymerizing one or more alpha-olefins of formula CH 2 ═CHT wherein T is a hydrogen atom or a C 1 –C 20 alkyl radical comprising the following steps: a) contacting in a...
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7115687 |
Process and apparatus for producing olefin polymers
The present invention concerns a process and an apparatus for continuous polymerisation of olefin monomers in a cascade of polymerisation reactors. According to the process, an olefin monomer is...
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