1329 results about "Ethylene polymerization" patented technology

The present invention relates to a catalyst or catalyst system for polymerization and copolymerization of olefine and its synthesis process and the application in catalyzing olefine polymerization. The catalyst is a kind III to XI transition metal compound with multitooth ligand.

The invention discloses an application of load non- metallocene catalyst in the slurry process for vinyl polymerying, the load non- metallocene catalyst and catalyst promoter forming the catalytic system, the alkene polymerization comprising: vinyl homopolymerization, combined polymerization of vinyl with propylene, butylenes, hexane, octane or norbornene; the catalyst carrier being chosen from: inorganic oxide of metallic oxide from IIA, IIIA, IVA, and IVB groups, or oxided mixture and mixing oxide; the catalyst promoter being chosen from: methylaluoxane, ethylaluoxane, isobutylaluoxane, trimethylaluminum,triethylaluminum,triisobutylaluminum,methylaluoxane-trimethylaluminum or methylaluoxane-triethylaluminum; the mole proportion between the catalyst promoter and catalyst being Al/Ti= 1:1-500. The inventioin is characterized by the less methylaluoxane consumption, stable reaction, easy-to-control polymerization temperature and non still-sticking phenomenon. The produced polyolefine possesses perfect granual shape, and the maximum polymer clamp density can reach 0.385 g/ml.

This invention relates to a method for preparing catalyst for ethylene homopolymerization or copolymerization with other alpha-olefins. The catalyst comprises at least one Mg composite, at least one Ti compound, at least one organic alcohol compound, and at least one Si compound. The general formula of the Si compound is R1xR2ySi (OR3) z, where R1 and R2 are alkyl or halogen; R3 is alkyl; x is 0-2; y is 0-2; z is 0-4; x + y + z = 4. The catalyst has such advantages as high catalytic activity, high hydrogen sensitivity and narrow particle size distribution of polymer. The catalyst is suitable for slurry polymerization of ethylene, and combined polymerization process where catalyst with high activity is needed.

The invention discloses an alpha-nickel diimine compound olefin polymerization catalyst and a preparation method thereof, and a method for preparing branched polyethylene. Structural formulas of the alpha-nickel diimine compound olefin polymerization catalyst are shown as a formula (I) and a formula (II), and the preparation method of the alpha-nickel diimine compound olefin polymerization catalyst is simple and low in cost, and can catalyze ethylene polymerization with high activity at a temperature of more than or equal to 80 DEG C to obtain high molecular weight polyethylene. The polyethylene prepared by catalyzing of the alpha-nickel diimine compound olefin polymerization catalyst has high molecular weight, and can prepare molecular weight which reaches more than 10<2>*kg/mol in the temperature range of between 0 and 80 DEG C.

The invention relates to a catalyst for ethene polymerization, and comprises the following components: A, a titanium containing solid catalyst component, which is prepared by the following steps: magnesium halide, organic epoxy compounds, organic phosphorous compounds, organic alcohol compounds are reacted for forming a uniform solution; and the solution, aromatic ester compounds, halide compounds of transition metallic titanium or derivatives thereof are mixed, and thereby obtaining the solid catalyst component; B. organic aluminium compound, whose general formula is AlRnX3-n, wherein, R is an alkyl which contains 1-20 hydrogen or carbon atoms, X is a halogen atom, and n is an integer which is less or equal to 3 and more than 0. The catalyst has the advantages of high catalytic activity and good hydrogen response, and the polymer has high bulk density, and the catalyst is suitable for homopolymerization of ethylene or copolymerization of ethylene and other alpha-alkenes.

The invention discloses an olefin polymeric catalyst and preparing method and reacting technology, which is characterized by the following: the expression formula of catalyst is [SiO2-Cat], wherein Cat represents semi-sandwich homogeneous phase catalyst of transient element metallic titanium (IV) or zirconium (IV); SiO2 represents dielectric molecular sieve SBA-15 decorated by methyl alundum alkyl, which can synthesize polyethylene; the catalyst possesses high ethylene polymeric activity, which displays ultrahigh molecule with different patterns.

A catalyst for the polymerization or copdymerization of olefin is composed of Ti-contained solid component A, organoaluminium compound B and organosilicon compound C. Said A is prepared through dissolving magnesium halide in the mixture of organic epoxy compound, organophosphorus compound and inertial diluent, adding educing agent and magnesium halide or its derivatives to educe out Mg/Ti contained deposit, and carrying a surface modifier, a titanium halide or derivative and an electronic doner. It can be used for the polymerization of propene or copolymerization of propene-ethene.

The present invention concerns a process for producing homogeneous polyethylene materials and processes for making high density, medium density and low density films therefrom. The process involves producing a polyethylene composition in a multistage reaction sequence of successive polymerization stages in the presence of an ethylene-polymerizing catalyst system. According to the invention, the process is carried out using an unsupported catalyst having magnesium and titanium as active constituents, in at least one loop polymerization stage and at least one gas phase polymerization stage and, operated with different amounts of hydrogen and comonomers to produce a high molecular weight portion in one of the polymerization stages and a low molecular weight portion in another so as to provide a polyethylene composition with the low molecular weight part having a MFR2 of 250 g/10 min or more. With this process it is possible to obtain homogeneous bimodal polyethylene material.

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 reaction zone has a length of 1.5-6.5 times the length of the primary reaction zone and a cross-sectional area of 1.2-4 times the cross-sectional area of the primary reaction zone. Ethylene is fed continuously into the primary reaction zone at the starting point of the primary reaction zone. Low temperature initiator alone, or an initiator mixture containing mainly low temperature initiator is introduced into the primary reaction zone at the starting point of the primary reaction zone. Initiator alone or an initiator mixture is introduced into the secondary reaction zone at two or more different points of the secondary reaction zone. Ethylene polymer products of various physical properties are produced with high productivity, while the pressure drop is minimized.

The invention discloses a meso-porous composite material, a preparation method thereof, a catalyst ingredient preparation method, and a polyethylene preparation method. The meso-porous composite material comprises a molecular sieve material with a hexagonal tunnel structure and silica gel, the meso-porous composite material is spherical, the pore volume of the meso-porous composite material is 0.5-1.8mL/g, the specific surface area is 200-650m<2>/g, the average particle size is 20-60[mu]m, the apertures are distributed in a double peak manner, two peaks respectively correspond to a first most probable aperture and a second most probable aperture, the first most probable aperture is 1-3nm, and the second most probable aperture is 10-30nm. The meso-porous composite material still keeps an ordered meso-structure after loading. Active components Mg and Ti are loaded on the composite material to prepare a catalyst ingredient, and the catalyst ingredient makes a catalyst keep high catalytic activity in ethylene polymerization and allows polyethylene particle powder to be obtained.

A catalyst for polymerizing ethylene features that in preparing the mother liquid of its active component, a treating agent is used and the mole ratio of alkoxy to Ti is controlled to be less than 1. As a result, the resultant catalyst component and the organoaluminium cocatalyst can be used for the copolymerizing reaction of ethylene and high-grade alpha-olefine with less resultant hexane and higher catalyst efficiency.

This invention relates to a transition metal nickel catalyst component after ethylene polymerization. Component (A) is halogenated [N, N-(R bed -2-pyridine methylene)-substitution benzidine] nickel complexes, component (B) is alumina alkyl. The catalysis system is used to ethylene polymerization. There are high polymerization activity and high branching degree of complexes, and double peak feature of the complexes.

The invention relates to a catalyst component applied to a vinyl polymerization reaction, a preparation method of the catalyst component and a catalyst thereof. The catalyst component comprises a magnesium-alcohol compound, a titanium compound, an organic aluminum compound, a long-carbon-chain monoester compound and a short-carbon-chain monoester compound. The catalyst has high activity and high hydrogen regulation sensitivity.

The invention relates to novel Ziegler-Natta olefin polymerization catalysts with single-site center property. The catalysts are characterized in that the catalysts are obtained by adopting a one-pot method and adding novel multidentate ligands (I), magnesium compounds, metal compounds and carriers to tetrahydrofuran solution for treatment. Under the action of alkylaluminium or alkylaluminoxane and other cocatalysts, the catalysts can obtain ethylene copolymer and homopolymer products with controllable molecular weight distribution (1.6-40) and uniformly distributed comonomers through high activity. The catalysts can realize catalytic ethylene polymerization, as well as the slurry-process or gas-phase-process homopolymerization or copolymerization of ethylene and 1-olefin, annular olefin, polar monomer and the like.

An ethylene polymer having small values of Mw/Mn and Mz/Mw, a small proportion of long-chain branches, a high melt tension and a high swell ratio and a process for preparing the same by polymerizing ethylene in the presence of an ethylene polymerization catalyst comprising a solid titanium catalyst component containing titanium, magnesium, halogen and a compound having at least two ether linkages present through plural atoms with an organometallic compound catalyst component.

The invention relates to a catalyst component used for ethylene polymerization reaction and a catalyst thereof. The catalyst component contains magnesium composite, titanium compound, organic alcoholic compound and boron compound. The organic boron compound is selected from at least one of structural formula 1, structural formula 2 and structural formula 3. The catalyst of the invention is quite applicable for a slurry polymerization process of ethylene, and the catalyst has better hydrogen regulation sensitivity and higher catalytic activity.

The present invention relates to the preparation process of one kind of composite carbon nanotube/polyethylene material. Single or multiple wall carbon nanotube is treated with oxidant to obtain functional carbon nanotube with hydroxyl, carbonyl and carboxyl groups on the surface; and further reacted with alkyl metallizing compound in inert atmosphere to connect metal organic matter component capable of catalyzing ethylene polymerization to obtain carbon nanotube supporting olefin polymerization catalyst. In the presence of alkyl metallizing compound as catalyst assistant, the prepared carbon nanotube supporting olefin polymerization catalyst catalyzes ethylene polymerization to obtain the composite carbon nanotube/polyethylene material. The composite material has two components homogeneously dispersed, electric and mechanical performance higher than other polyethylene material.

The present invention relates to a method for optimizing the sequential use of at least two ethylene polymerization catalysts to an ethylene polymerization loop reactor, comprising:

• • transferring to a mixing vessel a first ethylene polymerization catalyst and a first diluent, thereby providing a first catalyst slurry,
  • transferring said first catalyst slurry from said mixing vessel to an ethylene polymerization loop reactor at a concentration suitable for polymerizing ethylene,
  • increasing the ratio of said diluent to said first ethylene polymerization catalyst in said first catalyst slurry,
  • stopping the supply of said first catalyst slurry to said mixing vessel,
  • stopping the supply of said first catalyst slurry to said ethylene polymerization loop reactor,
  • stopping the supply of ethylene to said ethylene polymerization loop reactor,
  • removing said first catalyst slurry from said ethylene polymerization loop reactor,
  • emptying said mixing vessel,
  • optionally rinsing said mixing vessel with fresh diluent,
  • transferring to said mixing vessel a second ethylene polymerization catalyst and a second diluent, thereby providing a second catalyst slurry,
  • decreasing the ratio of said second diluent to said second ethylene polymerization catalyst in said mixing vessel to obtain a concentration of said second ethylene polymerization catalyst in said second diluent suitable for polymerizing ethylene,
  • transferring said second ethylene polymerization catalyst slurry from said mixing vessel to said ethylene polymerization reactor,
  • restoring the supply of ethylene to said ethylene polymerization loop reactor,
  • restarting ethylene polymerization in said ethylene polymerization loop reactor.

The present invention relates to a method for optimizing the sequential feeding of at least two ethylene polymerization catalysts to an ethylene polymerization reactor, comprising:

• • transferring to a mixing vessel a first ethylene polymerization catalyst and a first diluent,
  • decreasing the concentration of said first ethylene polymerization catalyst in said mixing vessel,
  • transferring to said mixing vessel a second ethylene polymerization catalyst and a second diluent,
  • progressively replacing said first ethylene polymerization catalyst by said second ethylene polymerization catalyst and said first diluent by said second diluent,
  • increasing the concentration of said second ethylene polymerization catalyst in said mixing vessel,
  • sequentially transferring said first ethylene polymerization catalyst and said second ethylene polymerization catalyst from said mixing vessel to an ethylene polymerization reactor.

The present invention provides a kind of composite carrier catalyst for the polymerization and copolymerization of ethylene and its preparation process. The catalyst is prepared through dissolving magnesium halide in organic epoxy compound, organic phosphoric compound and inert diluent; treating the magnesium halide solution with alcohol compound; and separation via adding great specific surface area inert carrier in the presence of alkane liberation assistant and adding the halide of transition metal titanium for co-separation. The catalyst is used in the polymerization and copolymerization of ethylene and exhibits high catalytic activity, good hydrogen regulating sensitivity, excellent granular shape and less polymer produced.

The invention belongs to the field of olefin catalytic polymerization, and particularly discloses a nickel base complex, and a preparation method and application thereof. The structural formula of the nickel base complex is as shown in a formula (I), wherein in the formula (I), R1 and R2 are independently selected from alkyl, aromatic base or arylenealkyne; R3 is hydrogen or alkyl; X is halogen. The complex provided by the invention has large skeleton steric hindrance, can effectively prevents an aniline aromatic ring from rotating, effectively shield a metal center, and increase the catalyst activity, is good in temperature resistance and applicable to industrial application, and can catalyze ethylene polymerization to obtain polyethylene with high molecular weight, narrow distribution and high branching coefficient under the activation of different cocatalysts; molecular weight of polyethylene obtained by polymerizing at high temperature of 100 DEG C reaches more than 105g/mol; the nickel base complex has better application prospect.