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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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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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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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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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7238756 |
Polymerization process and control of polymer composition properties
Methods of controlling the flow index and/or molecular weight split of a polymer composition are disclosed. The method of producing a polymer composition in one embodiment comprises incorporating a...
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7217772 |
Process for production of propylene homopolymers
A process for producing propylene homopolymers comprises producing a homopolymer in a reactor train having a first stage and a second stage, wherein the first stage is normally used for homopolymer...
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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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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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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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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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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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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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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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6720396 |
Polymerization process
The present invention relates to a catalyst composition of an activator, a catalyst compound and a support in a liquid. The catalyst composition of the invention is utilized as prepared, in the...
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6716936 |
Cascaded boiling pool slurry reactors for producing bimodal low to medium density polyethylene polymers
The use of two or more light solvent boiling pool reactors in series allows polymerization of ethylene and comonomer(s) to cost effectively produce bimodal polyethylene copolymers having lower...
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6630548 |
Static reduction
A gas-phase process for polymerizing an olefin is disclosed. The process involves feeding the catalyst into the reactor in a stream of gas that comprises at least 75 volume % of a noble gas in...
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6624266 |
Compositions and methods of using preactivated unsupported catalyst compositions having a given concentration
Preactivated unsupported catalyst compositions methods of using them are disclosed whereby the compositions have a concentration of preactivated catalyst of at least about 0.04 mmol of preactivated...
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6596823 |
Process for manufacturing a polyolefin resin
Continuous process for manufacturing a polyolefin resin in at least two polymerization reactors connected in series, in which the polymer suspensions leaving the reactors are transferred into...
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6586537 |
Process for manufacturing an olefin polymer composition
Process for manufacturing an olefin polymer composition in at least two polymerization reactors connected in series, in which the suspension of polymer in a diluant, formed in the first reactor, is...
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6576721 |
Process for producing low polymer of ethylene
There is disclosed a process for producing an ethylenic oligomer which comprises subjecting ethylene to oligomerization reaction in an organic solvent in the presence of a Ziegler based catalyst,...
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6576720 |
Preparation of polyvinyl alcohol
A process for preparing polyvinyl alcohol by means of catalytic transesterification of an alcoholic polyvinyl ester solution and subsequent workup by means of isolation of the polyvinyl alcohol...
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6566460 |
Continuous recovery of polymer from a slurry loop reactor
An apparatus and method for continuously removing polymer from a pressurized loop olefin polymerization reactor containing a slurry of polymer particles and fluids. The slurry is continuously...
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6559247 |
Direct recycle fractionation method using a swing column
A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the...
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6548626 |
Method for preparing polyamides from lactams and polyamide extracts
A process for producing polyamides by reacting at least one lactam and optionally further polyamide-forming monomers with aqueous monomer and oligomer extracts obtained during the extraction with...
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6541578 |
Increased space-time yield in gas phase polymerization
The space time yield of a gas phase reactor, particularly a polyethylene reactor may be increased by replacing at least 80 weight % of the ballast gas with a gas having a higher heat capacity than...
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6528614 |
Process for the production of polyamide-6 from epsilon-caprolactam
The invention relates to a process for the production of polyamide-6 by polymerization of ε-caprolactam with full re-use of extracted caprolactam and oligomers. The extract is not subjected to a...
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6521721 |
Polymer production process
The present invention provides: a production process that enables to keep foaming state within a constant level and to obtain a polymer with good productivity and reproducibility with a practical...
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6518373 |
Method for producing highly reactive polyisobutenes
Polyisobutenes are prepared by the continuous preparation process, by polymerizing isobutene in the presence of a catalyst comprising boron trifluoride and at least one cocatalyst in an inert...
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6489409 |
Process for manufacturing olefin polymers
Process for manufacturing olefin polymers, in which some of the suspension of olefin polymer particles formed in a diluent is drawn off from the polymerization reactor and diluted by means of a...
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6472483 |
Dry product discharge from a gas phase polymerization reactor operating in the condensing mode
The liquid content of granular product removed from a fluidized bed polymerization reactor operating in the condensing mode is reduced or minimized by removing the product from a level in the...
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6437062 |
Gas phase olefin polymerization process
A process for the polymerization of olefins in a gas phase reactor operating in a non-condensed mode, in which the process is carried out in the presence of a catalyst system containing (a) a...
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6420516 |
Finishing design to increase the polymer content in an olefin solution polymerization process
The polymer recovery capacity of solution polymerization units is increased by flashing a polymer solution exiting olefin polymerization reactors to produce a concentrated polymer solution having a...
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6391985 |
High condensing mode polyolefin production under turbulent conditions in a fluidized bed
A fluidized bed olefin polymerization process is operated in the turbulent regime while utilizing greater than 17.5% liquid in the recycle fluid to remove the heat of reaction. The ratio of...
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6362290 |
Gas phase polymerization process
The present invention relates to a process for continuous gas phase polymerization of olefin(s) in a reactor containing a fluidized bed, consisting of a cylinder with a vertical side wall and of a...
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6340728 |
Method for olefin polymerization with recycling of co-catalyst
Disclosed are catalyst preparation olefin polymerization processes with the recycling of a co-catalyst. According to the olefin polymerization process activated single-site catalysts are prepared...
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6326455 |
Methods for treating cobalt catalyst in oxidation mixtures resulting from oxidation of hydrocarbons to dibasic acids
This invention relates to methods and reactor devices for controlling the oxidation of hydrocarbons to dibasic acids, in the presence of a cobalt catalyst and a monobasic acid, such as acetic acid,...
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6326442 |
Multistage method for manufacturing polyolefins
The present invention provides a method for substantially continuously polymerizing olefins comprising: introducing into a first reaction zone a fresh olefin polymerization catalyst; contacting...
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6310155 |
Process for preparing acrylic polymers in the presence of a radical initiator and a polymeric suspending agent
Process for the polymerization in aqueous suspension of acrylic monomers in the presence of a polymeric suspending agent, homopolymer or copolymer of a compound of formula: ##STR1## wherein: R 1 ...
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6306981 |
Gas phase polymerization process
A process for the manufacture of olefin polymers in a continuous gas phase polymerization reaction wherein monomer, after passage through the fluidized bed, is cooled to a temperature below its dew...
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6300633 |
In-line method for determining the residue content of an isocyanate and apparatus useful therefor
An in-line spectrometric method for determining the distillation residue content in an opaque, dark-colored mixture containing an isocyanate and tar-like materials (residue) during the isocyanate...
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6300429 |
Method of modifying near-wall temperature in a gas phase polymerization reactor
A falling film of water is applied around the periphery of a fluid bed olefin polymerization reactor to cool the wall and reduce the temperature in the fluid bed near the inside surface of the...
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6262192 |
Introducing a condensing agent into a fluidized bed polymerization reactor operated in the condensing mode
The present invention provides a polymerization process for producing polymers in a continuous gas phase fluidized bed reactor, wherein a recycle stream is allowed to cool down to below its dew...
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6262191 |
Diluent slip stream to give catalyst wetting agent
A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the...
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6225422 |
Gas fluidized bed polymerization process for olefins
A process for the continuous gas fluidised bed polymerisation of olefins, especially ethylene, propylene, or mixtures of these with other alpha olefins, wherein the monomer containing recycle gas...
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6218484 |
Fluidized bed reactor and polymerization process
A continuous process for the manufacture of olefin polymers in a continuous gas phase polymerization reaction wherein monomer, after passage through the fluidized bed, is cooled to a temperature...
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