WO2004029112A1 - Process for preparing an olefin polymerisation catalyst component with improved high temperature activity - Google Patents
Process for preparing an olefin polymerisation catalyst component with improved high temperature activity Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/04—Monomers containing three or four carbon atoms
- C08F110/06—Propene
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- the invention relates to a process for preparing a particulate olefin polymerisation catalyst component, particularly one comprising a Group 2 metal.
- the invention also relates to the use of such a catalyst component for preparing a catalyst, the activity maximum of which is shifted to a higher temperature 10 used in the polymerisation of olefins.
- Ziegler-Natta (ZN) type polyolefin catalysts are well known in the field of polymers, generally, they comprise (a) at least . a
- ZN catalyst formed from a transition metal compound of Group 4 to 6 of the Periodic Table (IUPAC, Nomenclature of Inorganic Chemistry, 1989), a metal compound of Group 1 to 3 of the Periodic Table (IUPAC) , and, optionally, a compound of . group 13 of the Periodic Table (IUPAC) and/or an internal 0 donor compound.
- ZN catalyst may also comprise (b) further catalyst component (s) , such as a cocatalyst and/or an external donor.
- a supported ZN catalyst system is prepared by impregnating the catalyst components on a particulate support material.
- the catalyst component (s) are supported on a porous, inorganic or organic particulate carrier material, such as silica.
- the carrier material is based on one of the catalyst components, e.g. on a magnesium compound, such as MgCl 2 .
- a magnesium compound such as MgCl 2
- This type of carrier material can also be formed in various ways.
- EP-A-713 886 of Japan Olefins describes the formation of MgCl 2 adduct with an alcohol which is then emulsified and finally the resultant mixture is quenched to cause the solidification of the droplets.
- EP-A-856 013 of BP discloses the formation of a solid Mg-based carrier, wherein the Mg-component containing phase is dispersed to a continuous phase and! the dispersed Mg- phase is solidified by adding the two-phase mixture to a liquid hydrocarbon.
- the formed solid carrier particles are normally treated with a transition metal compound and optionally with other compounds for forming the active catalyst.
- the morphology of the carrier is one of the defining factors for the morphology of the final catalyst.
- One disadvantage encountered with the supported catalyst systems is that a possible surface treatment (impregnation step) of the support with one or more catalytically active compounds may lead to non-uniform distribution of the active component (s) and in turn to an inhomogeneous polymer material.
- WO-A-00 08073 and WO-A-00 08074 describe further methods for producing a solid ZN-catalyst, wherein a solution of a Mg- based compound and one or more further catalyst compounds are formed and the reaction product thereof is precipitated out of the solution by heating the system.
- EP-A-926 165 discloses another precipitating method, wherein a mixture of MgCl 2 and Mg-alkoxide is precipitated together with a Ti- compound to give a ZN catalyst.
- EP-A-83 074 and EP-A-83 073 of Montedison disclose methods for producing a ZN catalyst or a precursor thereof, wherein an emulsion or dispersion of Mg and/or Ti compound is formed in an inert liquid medium or inert gas phase and said system is reacted with an Al-alkyl compound to precipitate a solid, catalyst. According to examples said emulsion is then added to a larger volume of Al-compound in hexane and prepolymerised to cause the precipitation.
- the precipitation of the catalyst component (s) ' may often proceed via a "tar-like" intermediate stage. Said undesired sticky precipitate agglomerates easily and sticks to the walls of the reactor. The morphology of the catalyst would then of course be lost.
- catalyst particles having a good morphology, size and uniform particle size distribution can be obtained by the new way of preparing Ziegler-Natta (ZN) type catalysts, for use in olefin polymerization, in particular for propylene polymerisation.
- ZN Ziegler-Natta
- the produced catalysts according to the invention have excellent morphology, good particle size distribution and activity maximum at higher temperature.
- the polymer particles produced by using the inventive catalyst have very good morphological properties, too.
- the inventive catalyst preparation is based on a liquid/liquid two phase system where no separate carrier materials such as silica are needed- in order to get solid catalyst particles.
- the present invention is therefore directed to a process for preparing an. olefin polymerisation catalyst component in the form of particles having a predetermined size range, said process comprising the steps of: a) preparing a solution of a complex of a Group 2 metal and an electron donor by reacting a compound of said metal with said electron donor or a precursor thereof in an organic liquid reaction medium; b) adding said solution of said complex to at least one compound of a transition metal to produce an emulsion the dispersed phase of which contains more than 50 mol% of the • Group 2 metal in said complex; c) agitating the emulsion in order to maintain the droplets of said dispersed phase within an average size range of 5 to 200 ⁇ m; d) solidifying said droplets of the dispersed phase; e) recovering the solidified particles of the olefin polymerisation catalyst component; wherein- an aluminium alkyl compound of the general .formula .
- R stands for a straight chain or branched alkyl group having 1 to 20, preferably 1 to 10 and more preferably 1 to 6 carbon atoms
- X stands for halogen
- n stand for 0, 1, 2 or 3, in particular 0, 1 or 2, is added and brought into contact with the droplets of the dispersed phase of the agitated emulsion before recovering the solidified particles in step e) .
- the catalysts known so far show often their highest polymerisation activities (activity maximum) at temperatures of about 60 to 70 °C. If the polymerisation is carried out at a ' b ' ove “ ⁇ 7 " Q “" ⁇ 0 C “ 7 ⁇ ” e ⁇ rg “ : ⁇ at " “ “ around “ 80 “ °C “ “ or " higher, as it is e.g. desirable in some specific processes, the activity of the catalyst is not high enough, because the activity maximum of normal catalyst is at lower temperature. The catalyst activity is in some cases at 80 °C about half the activity found at 70°C.
- Polymerization processes where the catalysts of the invention are useful comprise at least one polymerization stage.
- the polymerization process comprises additional polymerization stages or reactors.
- the process contains at least one bulk reactor zone and at least one gas phase reactor zone, each zones comprising at least one reactor and all reactors being arranged in cascade.
- the polymerization process for polymerizing olefins, in particular propylene optionally with comonomers, like ethylene or other ⁇ -olefins comprises at least one bulk reactor and at least one gas phase reactor arranged in that order.
- the process may further comprise pre- and post reactors. In these kinds of processes use of higher polymerization temperature (above 70
- °C preferably 80 o C' or higher, e.g. 85 -°C or higher
- 80 o C' or higher e.g. 85 -°C or higher
- an alkyl Al compound e.g. triethyl aluminium, tri iso. butyl aluminium, or an alkyl Al compound bearing one to three halogen atoms
- the basic idea and target of the invention was to obtain a catalyst, the activity maximum of which have shifted to a higher temperature.
- this means that the new catalysts of the invention are very suitable for polymerization processes where higher temperature (> 70°C) are used, because they have their activity maximum at higher temperature range. This means that the catalyst activity remains about the same. or is even improved . when the polymerization is carried at higher temperature compared to the catalysts prepared without the alkyl Al compound addition.
- the activity maximum of the catalyst is not necessary at one single temperature point but rather within a temperature range. According to the results obtained by the inventors there seem to be three variables, which effect on the results, namely; the adding step of Al-compound the amount of Al-compound - the type of Al-compound.
- the addition of the aluminium compound may be started from step b) until the completion of the particle formation.
- the completion of the particle formation is usually achieved when the remaining toluene-soluble .components have been washed out from the catalyst particles during solidifying said particles.
- the aluminium compound can be preferably added, in pure form or in the form of a solution, from shortly before the beginning of the emulsion formation until adding it to the washing liquid, mostly toluene, in such an amount that the final Al content of the particles is from 0,05 to 1 %, preferably 0,1 to 0,8 % and most preferably 0,2 to 0,7 % by weight of the final catalyst particles.
- the most preferred Al content can vary depending on the type of the Al compound and on the adding step. E.g. in some cases the most preferred amount can be e.g. 0,1 to 0,4 wt-% .
- the preferred compounds are tri- (Ci-C ⁇ ) -alkyl aluminium compounds, triethylaluminium being most preferred.
- the new inventive .method can be easily scaled up in order to avoid common .up-scaling problems in the prior art which led to unsatisfied catalyst morphology and particle size distribution as well as reduced activity at higher temperature.
- the inventive process further comprises washing and drying said recovered solidified particles to obtain said catalyst component in a purified form.
- the Group 2 metal used in step a of the inventive process is preferably magnesium, and the liquid organic medium comprises preferably a C 6 -C ⁇ o aromatic hydrocarbon, preferably toluene.
- As electron donor compound to be reacted with the Group 2 metal compound is preferably an mono- or diester of an aromatic carboxylic acid or diacid, the latter being able to form a chelate-like structured complex.
- Said aromatic carboxylic acid ester or diester can be formed in situ by reaction of an aromatic carboxylic acid chloride or diacid dichloride with a C 2 -Cie alkanol and/or diol, and is preferable dioctyl phthalate.
- the reaction . for the preparation of the Group 2 metal complex is generally carried out at a temperature of 20° to 80°C, and in case that the Group 2 metal is magnesium, the preparation of the magnesium complex is carried out at a temperature of 50° to 70°C.
- the compound of a transition metal is preferably a compound of a Group 4 metal.
- the Group 4 metal is preferably titanium, and its compound to be reacted with the complex of a Group 2 is preferably a halide.
- a compound of a transition metal used in the process can also contain organic ligands typically used in the field known as a single site catalyst .
- a compound of a transition metal can also be selected from Group 5 metals, Group 6 metals, Cu, Fe, Co, Ni and/or Pd compounds.
- the complex of the Group 2 metal is preferably a magnesium complex.
- the invention will henceforth be described in relation to a preferred embodiment of the process, namely to a process for the preparation of a Ziegler-Natta type catalyst.
- the present invention is directed to a process for producing catalysts of the Ziegler-Natta type in the form of particles having a predetermined size range, said process comprising: preparing a solution of magnesium complex by reacting an alkoxy magnesium compound and an electron donor or precursor thereof in a C 6 -C ⁇ 0 aromatic liquid reaction medium; reacting said magnesium complex with a compound of at least one fourvalent Group 4 metal at a temperature greater than 10 °C and less than 60°C to produce an emulsion of a denser, TiCl 4 /toluene-insoluble, oil dispersed phase having, Group 4 metal/Mg mol ratio 0.1 to 10 in an oil disperse phase having Group 4 metal/Mg mol ratio 10 to 100; agitating the emulsion, optionally in the presence of an emulsion stabilizer and or a turbulence minimizing agent, in order to maintain the droplets of said dispersed phase within an average size range of 5 to 200 ⁇ m.
- the catalyst particles are obtained
- the said disperse and dispersed phases are thus distinguishable from one another by the fact that the denser oil, if contacted with a solution of titanium tetrachloride in toluene, will not dissolve in it.
- a suitable solution for establishing this criterion would be one having a toluene mol ratio of 0.1 to 0.3. They are also distinguishable by the fact that the great preponderance of the Mg provided (as complex) for the reaction with the Group 4 metal compound is present in the dispersed phase, as revealed by comparison of the respective Group 4 metal/Mg mol ratios.
- reaction product is encouraged by carrying out the Mg complex/Group 4 metal compound reaction at low temperature, specifically above 10°C but below 60°C, preferably between above 20 °C and below 50°C. Since the two phases will naturally tend to separate into a lower, denser phase and supernatant lighter phase, it is necessary to maintain the reaction product as an emulsion by agitation, preferably in the presence of. an emulsion stabiliser.
- the resulting particles from the dispersed phase of the emulsion ' are of a size, morphology (spherical ' shape) and uniformity which render the ultimate catalyst component extremely effective in olefin polymerisation.
- This morphology is preserved during the heating to solidify the particles, and of course throughout the final washing and drying steps. It is, by contrast, difficult to the point of impossibility to achieve such morphology through precipitation, because of the fundamental uncontrollability of nucleation and growth, and the large number of variables which affect these events.
- the electron donor is preferably an aromatic carboxylic acid ester, a particularly favoured ester being dioctyl phthalate.
- the donor may conveniently be formed in situ by reaction of an aromatic carboxylic acid chloride precursor with a C 2 -Ci6 alkanol and/or diol.
- the liquid reaction medium preferably comprises toluene.
- emulsifying agents/emulsion ' stabilisers can be used additionally• in a manner known in the art for facilitating the formation and/or stability of the emulsion.
- surfactants e.g. a class based on acrylic or methacrylic polymers can be used.
- said emulsion stabilizers are acrylic or methacrylic polymers, in particular those -with medium sized ester side chains having more than' 10, preferably more than 12 carbon atoms and preferably ⁇ less than 30, and preferably 12 to 20 carbon atoms in the ester side chain.
- Particular preferred are unbranched C 12 to C 2 o acrylates such as poly (hexadecyl) -methacrylate and poly (octadecyl) -methacrylate.
- TMA turbulence minimizing agent
- said TMA serves for a grain size limitation by reducing the turbulences in the emulsion during agitation, thus leading to a more uniform grain formation. Most probably, the mixing energy is better distributed into the emulsion. Further reasons might be seen in an interaction of the TMA with the surface of the grain, leading to a size limitation of the grain.
- Reaction mixture here means the solution from the initial organic liquid reaction medium, over the solution of the complex up to the emulsion before solidifying the particles of the dispersed phase of the emulsion.
- the TMA is added to the reaction mixture when the emulsion is formed.
- Said TMA agent has to be inert under the reaction conditions and soluble in the reaction mixture under the reaction conditions, which means that preferably polymers without polar groups are preferred.
- said TMA or mixtures thereof are preferred as polymers having linear aliphatic carbon backbone chains, which might be branched with short side chains only in order to serve for uniform flow conditions when stirring.
- Said TMA is in particular preferably selected from ⁇ -olefin polymers having a high molecular weight of MW about 1 - 40 x 10 6 , or mixtures thereof.
- polymers of ⁇ - olefin monomers with 6 to 20 carbon atoms most preferable is polydecene.
- the turbulence minimizing agent is preferably selected from the group consisting of inert poly (Ce-C 2 o) - olefines or mixtures thereof, and more preferably from polyoctene, polynonene, polydecene, polyundecene or polydodecene or mixtures thereof, having the molecular weight and general backbone structure as defined before.
- said turbulence minimizing agent can be added in any process step before particle formation starts, i.e. in any step before solidification of the emulsion, and is added to the emulsion in an amount of 1 to 1.000 ppm, preferably 5 to 100 ppm and more preferable 5 to 50 ppm, based on the total weight of the reaction mixture.
- the ratio of the mol ratio Group 4 metal/Mg in the disperse phase oil to that in the denser oil is at least 10.
- Solidification of the dispersed phase droplets by heating is suitably carried out at a temperature of 70-150°C, usually at 90-110°C.
- Preparation of the magnesium complex may be carried out over a wide range of temperatures, 20 to 80°C being preferred, 50 to 70°C most preferred.
- the finally obtained catalyst component is desirably in the . form of particles having generally an average size range of 5 to 200 ⁇ , preferably 10 to 100, more preferably 20 to 50 ⁇ m.
- the present invention further comprehends an olefin polymerisation catalyst comprising a catalyst component prepared as aforesaid, in association with an alkyl aluminium cocatalyst and optionally donors, and the use of that polymerisation catalyst for the polymerisation Of C 2 to C X o- olefins.
- the reagents can be added to the aromatic reaction medium in any order. However it is preferred that in a first step the alkoxy magnesium compound is reacted with a carboxylic acid halide precursor of the electron donor to form an intermediate; and in a second step the obtained product is further reacted with the Group 4 metal.
- the magnesium compound preferably contains from 1 to 20 carbon atoms per alkoxy group, and the carboxylic acid should contain at least 8 carbon atoms .
- Reaction of the magnesium compound, carboxylic acid halide and polyhydric alcohol proceeds satisfactorily at temperatures in the range 20 to 80 °C, preferably 50 to 70 °C.
- the product of that reaction, the "Mg complex” is however reacted with the Group 4 metal compound at a lower temperature, contrary to previous practice, to bring about the formation of a two- phase, oil-in-oil, product.
- the technique adopted in the novel regimen of the invention is inherently more precise than that formerly employed, and thus further contributes to product consistency, as well as sharply reducing the volumes of solvent to be handled and thus improving process economics.
- the reaction medium used as solvent can be aromatic or a mixture of aromatic and aliphatic hydrocarbons, the latter one containing preferably 5 - 9 carbon atoms, more preferably 5 - 7 carbon atoms, or mixtures thereof.
- the liquid reaction medium used as solvent in the reaction is aromatic and is more preferably selected from hydrocarbons such as., substituted and unsubstituted benzenes, preferably from alkylated benzenes, even more preferably from toluene and the xylenes, and is most preferably toluene.
- the molar ratio of said aromatic medium to magnesium is preferably less than 10, for instance from 4 to 10, preferably from 5 to 9.
- the recovered particulate product is washed: at least once, preferably at least twice, most preferably at least three . . times with a hydrocarbon, which preferably is selected from aromatic and aliphatic hydrocarbons, preferably with toluene, particularly with hot (e.g. 90°C) toluene, which might include a small amount, preferably a few vol-%, such as about 5 vol-% of TiCl 4 in it.
- a further wash is advantageously performed with- heptane, most preferably with hot (e.g. 9Q°C) heptane, and yet . a further wash with pentane.
- a washing step typically includes several substeps .
- a favoured washing sequence is, for example, one wash with toluene at 90°C, two washes with heptane at 90°C and one or two washes with pentane at room temperature. It is also possible that all washings will be done with the same solvent, e.g. toluene.
- the washing can be optimized to give a catalyst with novel and desirable properties.
- the washed catalyst component is dried, as by evaporation or flushing with nitrogen.
- the intermediates as well as the final product of the process be distinct compounds with an essentially stoichiometric composition. Often, they are complexes.
- a complex is, according to R ⁇ mpps Chemie-Lexicon, 7. Edition, Franckh'sche Verlags Stuttgart, W. Keller & Co., Stuttgart, 1973, page 1831, "a derived name of compounds of higher order, which originate from the combination of molecules, - unlike compounds of first order, -in the creation of which atoms participate".
- the alkoxy magnesium compound group is preferably selected from the group consisting of magnesium dialkoxides, complexes of a magnesium dihalide and an alcohol, and complexes of a magnesium dihalide and a magnesium dialkoxide. It may be a reaction product of an alcohol and a magnesium compound selected from the group consisting of dialkyl magnesiums, alkyl magnesium alkoxides, alkyl magnesium halides and magnesium dihalides. It can further be selected from the group consisting of dialkyloxy magnesiums, diaryloxy magnesiums, alkyloxy magnesium halides, aryloxy magnesium halides, alkyl magnesium alkoxides, aryl magnesium alkoxides and -alkyl - magnesium aryloxides.
- the magnesium dialkoxide may be the reaction product of a magnesium dihalide such as magnesium dichloride or a dialkyl magnesium of the formula R 2 Mg, wherein each one of the two Rs is a similar or different C ⁇ -C 20 alkyl, preferably a similar; or different C 4 -C ⁇ o alkyl.
- Typical magnesium alkyls are ethylbutyl magnesium, dibutyl magnesium, dipropyl magnesium, propylbutyl magnesium, dipentyl magnesium, butylpentylmagnesium, butyloctyl magnesium and dioctyl magnesium.
- one R of the formula R 2 Mg is a butyl group and the other R is an octyl group, i.e.
- dialkyl magnesium compound is butyl octyl magnesium.
- Typical alkyl-alkoxy magnesium compounds RMgOR when used, are ethyl magnesium butoxide, butyl magnesium pentoxide, octyl magnesium butoxide and octyl magnesium octoxide.
- Dialkyl magnesium, alkyl magnesium alkoxide or magnesium dihalide can react with a monohydric alcohol R'OH , o.r a mixture thereof with a polyhydric alcohol R' (OH) m .
- Ci -C 2 o monohydric alcohols are methanol, ethanol, n- propanol, iso-propanol, n-butanol, iso-butanol, sec.butanol, tert .butanol, n-amyl alcohol, iso-amyl alcohol, sec.amyl alcohol, tert.amyl alcohol, diethyl carbinol, akt. amyl alcohol, sec. isoamyl alcohol, tert. butyl carbinol.
- Typical C 6 - Cio monohydric alcohols are hexanol, 2-ethyl-lbutanol, 4- methyl-2-pentanol, 1-heptanol, 2-heptanol, .4-heptanol, 2,4- dimethyl-3pentanol, 1-octanol, 2-octanol, 2-ethyl-l i -hexan ⁇ l, 1-nonanol, 5-nonanol, dilsobutyl carbinol, 1-decanol and 2,7- dimethyl-2-octanol.
- Typical >C ⁇ 0 monohydric alcohols are n-1- undecanol, n-1-dodecanol, n-1-tridecanol, n-l-tetradecanol n- 1-pentadecanol, 1-hexadecanol, n-1-heptadecanol and n- 1 octadecanol.
- the monohydric alcohols may be unsaturated, as long as they do not act as catalyst poisons.
- Preferable monohydric alcohols are those of formula R'OH in which R' is a C 2 -C 16 alkyl group, most preferably a C4-C12 alkyl group, particularly 2-ethyl-l-hexanol.
- the aromatic reaction medium may also contain a polyalcohol-, which may be straight- or branched-chain.
- Typical C 2 to ⁇ polyhydric alcohols may be straight-chain or branched and include ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2,3-butylene glycol, 1, 5-pentanediol, 1, 6-hexanediol, 1, 8-octanediol, pinacol, diethylene glycol, triethylene glycol, and triols such as glycerol, methylol propane and pentareythritol.
- the polyhydric alcohol can be selected on the basis of the activity and morphology it , gives the catalyst component .
- essentially all of the aromatic ' ' carboxylic acid ester is a reaction product of a carboxylic acid halide, preferably a dicarboxylic- acid dihalide, more preferably an unsaturated ⁇ , ⁇ -dicarboxylic acid dihalide, most preferably phthalic acid dichloride, with the ' monohydric alcohol.
- a carboxylic acid halide preferably a dicarboxylic- acid dihalide, more preferably an unsaturated ⁇ , ⁇ -dicarboxylic acid dihalide, most preferably phthalic acid dichloride, with the ' monohydric alcohol.
- the compound of a fourvalent Group 4 metal compound containing- a halogen is preferably a titanium tetrahalide.
- Equivalent to titanium tetrahalide is the combination of an alkoxy titanium halide and a halogenat-ion agent therefore, which are able to form a titanium tetrahalide in si tu .
- the most preferred halide is the chloride, for zirconium and hafnium as well as for titanium. • '
- reaction conditions used in the claimed process may be varied according to the used reactants and agents.
- Reactive halogenated hydrocarbons preferably have the formula R'"X'" n wherein R' " is an n-valent C ⁇ -C 20 hydrocarbyl group, particularly a Ci-C ⁇ 0 paraffin, X'" is a halogen and n is an integer from 1 to 4.
- chlorinated hydrocarbons include monochloromethane, dichloromethane, trichloromethane (chloroform) , tetrachloro ethane, onochloroethane, (1, 1) -dichloroethane, (1, 2) -dichloroethane, (1, 1, 1) -trichloroethane, (1,1,2)- trichloroethane, (1, 1, 1, 2) -tetrachloroethane, (1,1,2,2) tetrachloroethane, pentachloroethane, hexachloroethane, (1)- chloropropane, (2) -chloropropane, (1, 2) -dichloropropane, (1, 3) -dichloropropane, (1, 2, 3) trichloropropane, (1)- chlorobutane, (2) -chlorobutane, isobutyl chloride, tert.butyl chlor
- R'" is preferably a mono-or bivalent Ci- Cio alkyl group
- X'" is preferably chlorine and, independently, n is preferably 1 or .2.
- Preferred compounds include butyl chloride. (BuCl) , dichloroalkanes such as (1, 4) -dichlorobutane, and tertiary butyl chloride.
- the catalyst preparation • can be carried out batchwise, it is also preferable and possible to prepare the catalyst component semi-continuously our continuously.
- the solution of the complex of the group 2 metal and said electron donor which is prepared by reacting the compound of said metal with said electron donor in an organic liquid reaction medium, is mixed with at least one compound of a transition metal., which might be solved in the same or different organic liquid reaction medium.
- the so obtained solution is then agitated, possibly in the presence of an emulsion stabilizer, and then the so-agitated emulsion is fed into a temperature gradient reactor, in which the emulsion is subjected a temperature gradient, thus leading to solidifying the droplets of a dispersed phase of the emulsion.
- the TMA is preferably contained in the solution of the complex or added to the solution before feeding the agitated solution to the temperature gradient reactor.
- an inert solvent in which the droplets are not soluble, can additionally be fed into that gradient reactor in order to improve the droplet formation and thus leading to a uniform grain size of the particles of the catalyst component, which are formed in the temperature gradient reactor when passing through said line.
- additional solvent might be the same as the organic liquid reaction medium, which is used for preparing the solution of the complex of the group 2 metal as explained above in more detail.
- the solidified particles of the olefin polymerisation catalyst component can subsequently be recovered by an in-strea filtering unit and then, optionally after some additional washing and drying steps in order to remove unreacted starting components, can be stored for further use.
- the catalyst can be fed after washing steps into the olefin polymerisation reactor, so that a continuous preparation and fed to the reactor is guaranteed.
- the formation of the solidified particles could be carried out in the temperature gradient line in the kind of pipe reactor, which is sufficiently long and which is subjected said temperature gradient from the starting temperature in the. lower range of 20 to 80°C up to a., "solidifying" temperature of 70 to 150 °C.
- the temperature gradient is preferably obtained by means of heating the pipe reactor from the outside by applying normal heaters, microwaves, etc.
- a filtering unit might preferably be used for filtering the solidified particles from -the solvent stream.
- various drums and sieving systems can be used, depending on the specific particle sizes-.
- Example 10 ia a comparative example without any addition of alkyl Al compound.
- the temperature of the reaction mixture was then slowly raised to 90 °C over a period of 20 minutes and held at that level for 30 minutes with stirring. After settling and syphoning the solids underwent washing with 100 ml toluene at 90 °C for 30 minutes, 60 ml heptane for 20 minutes at 90 °C and 60 ml pentane for 10 minutes at 25°C. Finally, the solids were dried at 60 °C by nitrogen purge, to yield a yellow, air- sensitive powder.
- Example 7 Preparation of the catalyst component (Example 7) The catalyst component was prepared in the same manner as described in example 1, except that the 2.0 ml of a solution in toluene of the aluminium compound were added to the reaction mixture after heating to 90°C.
- Example 8 Preparation of the catalyst component (Examples 8 and 9)
- the catalyst component was prepared in the .same - manner as described in example 1, except that the 2.0 ml of a solution in toluene of the aluminium compound were added to the washing toluene.
- the catalyst component was prepared in the same manner as described in example 1, except that no aluminium compound was added at all .'
- the propylene bulk polymerisation was carried out in a stirred 5 1 tank reactor.
- About 0.9 ml triethyl aluminium (TEA) as a co-catalyst, ca 0.12 ml cyclohexyl methyl dimethoxy silane (CMMS) as an external donor and 30 ml n-pentane were mixed and allowed to react for 5 minutes.
- Half of the mixture was then added to the polymerisation reactor and the other half was mixed with about 20 mg of a catalyst. After additional 5 minutes the catalyst/TEA/donor/n-pentane mixture was added to the reactor.
- the Al/Ti mole ratio was 250 mol/mol and the Al/CMMS mole ratio was 10 mol/mol.
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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AU2003276012A AU2003276012A1 (en) | 2002-09-30 | 2003-09-30 | Process for preparing an olefin polymerisation catalyst component with improved high temperature activity |
JP2004539053A JP2006501325A (en) | 2002-09-30 | 2003-09-30 | Process for producing olefin polymerization catalyst components for catalysts having improved high temperature activity |
EA200500403A EA008343B1 (en) | 2002-09-30 | 2003-09-30 | Process for preparing an olefin polymerisation catalyst component with improved high temperature activity |
BRPI0314812-2B1A BR0314812B1 (en) | 2002-09-30 | 2003-09-30 | Process for the preparation of an olefin polymerization catalyst component, olefin polymerization catalyst, and use thereof |
US10/529,812 US7659223B2 (en) | 2002-09-30 | 2003-09-30 | Process for preparing an olefin polymerization catalyst component with improved high temperature activity |
US12/641,384 US9260548B2 (en) | 2002-09-30 | 2009-12-18 | Process for preparing an olefin polymerization catalyst component with improved high temperature activity |
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EP02021973.9 | 2002-09-30 | ||
EP02021973.9A EP1403292B1 (en) | 2002-09-30 | 2002-09-30 | Process for preparing an olefin polymerisation catalyst component with improved high temperature activity |
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EP (1) | EP1403292B1 (en) |
JP (1) | JP2006501325A (en) |
CN (1) | CN1315892C (en) |
AU (1) | AU2003276012A1 (en) |
BR (1) | BR0314812B1 (en) |
EA (1) | EA008343B1 (en) |
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JP2006501325A (en) | 2006-01-12 |
EA008343B1 (en) | 2007-04-27 |
US20100113716A1 (en) | 2010-05-06 |
US7659223B2 (en) | 2010-02-09 |
US20060166814A1 (en) | 2006-07-27 |
PL209712B1 (en) | 2011-10-31 |
BR0314812B1 (en) | 2013-12-17 |
BR0314812A (en) | 2005-08-02 |
AU2003276012A1 (en) | 2004-04-19 |
CN1315892C (en) | 2007-05-16 |
US9260548B2 (en) | 2016-02-16 |
EA200500403A1 (en) | 2005-12-29 |
PL375016A1 (en) | 2005-11-14 |
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CN1701081A (en) | 2005-11-23 |
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