JPH06104692B2 - Method for producing catalyst carrier for olefin polymerization - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a catalyst carrier for olefin polymerization, and more specifically, it has good particle size characteristics of the olefin polymer to be produced and the activity of the catalyst to be formed. TECHNICAL FIELD The present invention relates to a method for producing a catalyst carrier for olefin polymerization having high efficiency.

[Prior Art and its Problems] Conventionally, as a method for producing a catalyst carrier for olefin polymerization in which the olefin polymer produced has good particle size characteristics,
There is known a method of supporting a magnesium compound on an oxide of an element belonging to Group II to IV, or supporting a magnesium compound on the oxide pretreated with a halogenating agent or a silicon compound (JP-A-58-58). No. 162607, Japanese Patent Sho 60-69
No. 62).

However, when titanium is supported on the carrier obtained by these methods, the hydroxyl groups present in the oxide react with titanium, and as a result, titanium does not act effectively on the polymerization. Therefore, in reality, the catalytic activity per titanium is low and has not reached a practical level.

The present invention has been made based on the above circumstances.

That is, it is an object of the present invention to provide a method for producing a catalyst carrier for olefin polymerization, in which the particle size characteristics of the olefin polymer produced are good and, in addition, the catalytic activity of titanium is not adversely affected but is increased.

As a result of earnest research by the present inventors in order to achieve the above-mentioned object, oxides of elements belonging to Groups II to IV of the periodic table and /
Alternatively, when the composite inorganic oxide containing this oxide is sequentially treated with a silicon halide and an alcohol in this order, the hydroxyl groups in the oxide become inactive, and the catalytic activity of titanium to be supported is increased. Heading to this invention.

[Means for Solving the Problems] An outline of the present invention for solving the problems is to provide an oxide of at least one element selected from elements belonging to Groups II to IV of the periodic table and a magnesium compound. In the method for producing a catalyst carrier for olefin polymerization obtained from, an oxide solid of at least one element selected from elements belonging to Groups II to IV of the periodic table and / or at least one of these oxides is used. After contacting the composite inorganic oxide containing the silicon halide and alcohols in this order,
An olefin characterized by contacting a solid substance obtained by separation with a magnesium alkoxide-containing liquid which is a mixture of at least one selected from the group consisting of hydrocarbons, electron donors and alkoxy titanium and magnesium alkoxide. A method for producing a catalyst carrier for polymerization,
The olefin polymerization catalyst carrier obtained by this method,
The catalytic activity of the titanium compound to be supported is not hindered, and the activity is increased accordingly.

In the method of the present invention, first, an oxide solid of at least one element selected from elements belonging to Groups II to IV of the periodic table and / or a composite inorganic oxide containing at least one of these oxides ( Hereinafter, these are abbreviated as (A) component) and silicon halide are brought into contact with each other.

The component (A) is brought into contact with the silicon halide in order to remove the hydroxyl group in the oxide solid or the composite inorganic oxide.

Here, as the oxide solid element belonging to periodic table II~IV group, for _{example, MgO, CaO, B 2 O} 3, SiO 2, SnO 2, Al
₂ O _{3 and the} like, and as the composite inorganic oxide containing at least one kind of oxides of elements belonging to Groups II to IV of the periodic table, SiO ₂ —Al ₂ O ₃ , SiO ₂ —MgO, SiO ₂ --TiO ₂ , SiO ₂ --V _{2
O 5 ,, SiO 2 -Cr 2 O} 2, SiO 2 -TiO 2 -MgO and the like.
These various oxides and composite inorganic oxides may be used alone, or two or more kinds of the oxides may be used together, or two or more kinds of the composite inorganic oxides may be used together. Alternatively, the oxide and the composite inorganic oxide may be used together.

Among the various oxides and complex inorganic oxides, especially
SiO ₂ is preferred.

As the silicon halide, those represented by the following general formulas (1) and (2) can be used.

_{Si n H m Xl (1)} Si o R p Xq (2) ( where in the formula, l, m, n, o , p, q with each a positive number, m + l = 2n + 2 and p + q = 2o
+2 is satisfied, R represents an alkyl group or an alkenyl group, and X represents any one of a fluorine atom, a chlorine atom, an iodine atom and an iodine atom. ) Specific examples of the silicon halide include SiCl
₄ , Si ₂ Cl ₆ , Si ₃ Cl ₈ , Si ₄ Cl ₁₀ , SiHCl ₃ , CH ₃ SiCl ₃ , (C
H ₃ ) ₂ SiCl ₂ , (CH ₃ ) ₃ SiCl, (CH ₃ ) ₃ SiCl, C ₂ H ₅ SiCl ₃ , (C ₂ H
₅ ) ₂ SiCl ₂ , chlorinated compounds such as (C ₂ H ₅ ) ₃ SiCl, fluorinated compounds obtained by replacing chlorine atoms in the chlorinated compounds with fluorine atoms, bromine atoms, and iodine atoms, bromine compounds, iodinated compounds Can be mentioned. Among these, the chlorinated compounds are preferable, and SiCl ₄ , CH ₃ SiCl ₃ , and (CH ₃ ) ₂ SiCl ₂ are particularly preferable.

The amount of silicon halide in contact with the component (A) may be in excess with respect to the component (A), and is usually 1 to 100 times the mol of the Group II to IV elements of the periodic table. Yes, and preferably 1 to 50 times mol.

The temperature at the time of contacting the component (A) with the silicon halide is preferably in the range of 0 to 200 ° C. If the temperature at the time of contact is as high as 300 ° C., thermal decomposition of the silicon halide may occur, which is not preferable.

The component (A) may be directly contacted with the silicon halide, and, for example, hexane, heptane,
It may be contacted in a hydrocarbon solvent such as benzene, toluene, xylene and the like.

The contact time between the component (A) and the silicon halide is usually 5 minutes to 24 hours. Also, the contact is
It is better to carry out under an inert gas atmosphere.

After the contact, the component (A) is preferably washed by decantation. This is because the washing treatment can favorably promote the subsequent contact with alcohols. The above-mentioned hydrocarbon solvent can be used as the washing solvent.

In the method of the present invention, it is important that the component (A) after contacting with the silicon halide is then contacted with the alcohol.

This is because if the component (A) is not brought into contact with alcohols, the titanium compound supported will be inactivated, and the amount of titanium effective for polymerization will decrease.

As the alcohols, monohydric alcohols and polyhydric alcohols can be used.

Examples of the monohydric alcohol include methanol,
Aliphatic saturated alcohols such as ethanol, propanol, isopropanol, butanol, and pentanol; aliphatic unsaturated alcohols such as allyl alcohol and crotyl alcohol; alicyclic alcohols such as cyclopentanol and cyclohexanol; benzyl alcohol and cinnamyl alcohol And the like; heterocyclic alcohols such as furfuryl alcohol; and the like. Examples of the polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycerin and the like. Among these, the aliphatic alcohols are preferable, and methanol and ethanol are particularly preferable.

Further, the amount of the alcohols to be brought into contact with the component (A) after contacting with the silicon halide is usually 1 with respect to the silicon halide reacted with the component (A).
~ 100 times mole is sufficient.

The contact between the component (A) and the alcohol is preferably carried out in an inert atmosphere. The temperature for contacting the component (A) with the alcohol may be in the range of normal temperature to reflux temperature, but is usually the reflux temperature. And
The contact time is not particularly limited, but is preferably 0.5 to 24 hours under reflux.

After the completion of the reaction by contact, it is preferable to sufficiently wash the component (A) with the alcohol or the washing solvent.

In the method of the present invention, it is important to separate the solid matter after the contact between the alcohol and the component (A) is completed.

If alcohols remain in the solid matter, the magnesium alkoxide added in the next step reacts with the residual alcohols, which adversely affects the catalytic performance. Therefore, it is preferable that the separated solid matter is sufficiently dried.

Next, in the method of the present invention, a magnesium alkoxide-containing liquid (hereinafter, simply referred to as magnesium alkoxide-containing liquid) which is a mixture of the solid matter and at least one selected from the group consisting of hydrocarbons, electron donors and alkoxytitanium and magnesium alkoxide. (Referred to as liquid).

Among the above hydrocarbons, electron donors and alkoxy titanium, alkoxy titanium is preferable.

Examples of the hydrocarbon include pentane, hexane,
Aliphatic hydrocarbons such as heptane, octane, decane, dodecane, tetradecane, kerosene, ligroin, petroleum ether; cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, cyclooctane,
Cycloaliphatic hydrocarbons such as cyclohexene; aromatic hydrocarbons such as benzene, toluene, xylene, ethylbenzene, cumene, cymene; halogenated hydrocarbons such as dichloroethane, dichloropropane, trichloroethylene, carbon tetrachloride, chlorobenzene, etc. Can be mentioned. Among these, hexane, heptane, and octane are preferable.

Examples of the electron donor include aliphatic alcohols, aromatic alcohols, ethers, aldehydes, ketones, carboxylic acids, carboxylic acid anhydrides, acid halides, amines, amides, nitriles, and isocyanates. Among these, alcohols Are preferred, and methanol, ethanol and the like are particularly preferred.

Examples of the alkoxytitanium include tetramethoxytitanium, tetraethoxytitanium, tetra-n-butoxytitanium, tetraisopropoxytitanium and the like, with tetra-n-butoxytitanium being particularly preferred.

As the magnesium alkoxide, it is possible to use a magnesium compound known per se used for a catalyst carrier for this kind of olefin polymerization, specifically, dimethoxymagnesium, diethoxymagnesium, dipropoxymagnesium, dibutoxymagnesium, Dicyclohexoxy magnesium etc. are mentioned. Of these, diethoxymagnesium is preferable, as is apparent from the examples described below.

The preparation of the magnesium alkoxide-containing liquid cannot be unequivocally different depending on the types of magnesium alkoxide, hydrocarbon, electron donor, and alkoxytitanium, but any one of the alkoxytitanium and the hydrocarbon, electron donor, or alkoxytitanium may be used. Examples thereof include a method of mixing with one kind or a mixture of two or more kinds, a method of mixing with heating and the like.

As a preparation method, for example, when (1) an alcohol and a hydrocarbon as electron donors are used, the alcohol, the hydrocarbon and the magnesium alkoxide are mixed using about 1 mol or more of the alcohol per 1 mol of the magnesium alkoxide. In the method, (2) when using tetraalkoxytitanium, for example, tetra-n-butoxytitanium, tetraethoxytitanium, tetraisopropoxytitanium, etc., the tetraalkoxytitanium is 0.5 mol or more, preferably 0.5 to 1 mol per mol of the magnesium alkoxide.
There is a method of mixing tetraalkoxytitanium and magnesium alkoxide in an amount of 10 mol, particularly preferably 0.5 to 5 mol.

The contact between the magnesium alkoxide-containing liquid thus obtained and the solid substance is 0 to 100 ° C, preferably 10 to 30 ° C.
It can be carried out by mixing the magnesium alkoxide-containing liquid and the solid matter under the temperature.
Upon this mixing, the magnesium alkoxide-containing liquid was added to the solid matter in an amount of 0.01 on a magnesium atom basis.
It is preferable to mix at a ratio of about 1 part by weight.

The contact time between the magnesium alkoxide-containing liquid and the solid material is usually 5 minutes to 24 hours.

By filtering the mixture of the magnesium alkoxide-containing liquid and the solid, it is possible to obtain a catalyst carrier for olefin polymerization, by adding a precipitating agent to the mixture, the magnesium compound is sufficiently precipitated, It is preferable to deposit the carried olefin polymerization catalyst carrier and separate it by decantation.

As the precipitating agent, lower alcohols such as methanol, ethanol, propanol, butanol and pentanol, and a halogenating agent described later can be used.

When a magnesium alkoxide-containing liquid is prepared using tetraalkoxy titanium, the lower alcohol used is preferably an alcohol having an alkyl group having a carbon number smaller than that of the tetra alkoxy titanium.

Examples of the halogenating agent include silicon tetrachloride, trichlorosilane, monomethyldichlorosilane, dimethylchlorosilane, ethyldichlorosilane, n-propyldichlorosilane, vinyldichlorosilane, n-butyldichlorosilane, phenyldichlorosilane. Chlorosilane, benzyldichlorosilane, allyldichlorosilane, monomethylmonochlorosilane, monoethylmonochlorosilane, trimethylmonochlorosilane, monomethyltrichlorosilane, and other halosilanes; diethylaluminum chloride, ethylaluminum dichloride, ethylaluminum sesquichloride, dimethylaluminum chloride, Organics such as methyl aluminum dichloride, methyl aluminum sesquichloride, propyl aluminum dichloride, dipropyl aluminum chloride Rumi halides; thionyl chloride; chloroform, hexa-trichloroethane, carbon tetrachloride, carbon tetrabromide, iodide atoms, a halogenated hydrocarbon or a halocarbon such as t- butyl chloride; AlC
Examples thereof include metal halides such as l ₃ , AlBr ₃ , SnCl ₄ , BCl ₃ , SbCl ₃ and ZnCl ₂ ; hydrogen halides such as hydrogen chloride; and halogens such as chlorine. Among these, halogen is preferable, and tetrachlorosilane is particularly preferable.

The amount of the depositing agent added is sufficient to deposit magnesium on the olefin polymerization catalyst carrier.

The olefin polymerization catalyst carrier obtained by this method,
The titanium compound is supported to serve as a solid catalyst component, and the solid catalyst component, the organometallic compound and the electron donor for polymerization serve as an olefin polymerization catalyst.

The preparation of the solid catalyst component, the preparation of the olefin polymerization catalyst, and the polymerization of olefin by the olefin polymerization catalyst will be described below.

The solid catalyst component can be obtained by contacting the reaction product of the catalyst carrier for olefin polymerization obtained by the method of the present invention with the electron donor and the titanium compound.

Examples of the electron donor include organic acid esters,
Examples thereof include aliphatic carboxylic acid ester and aromatic carboxylic acid ester.

As the titanium compound, those represented by the following general formula (3) can be used.

Ti (OR ¹ ) _4-u X _u (3) Here, R ¹ is an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group, an aryl group or an aralkyl group, and u is a real number of 0 or more and less than 4, X represents a halogen atom. Specific examples of these are titanium tetrahalides such as TiCl ₄ , TiB _r4 , and TiI ₄ ; Ti (OCH ₃ ) Cl ₃ , Ti (OC ₂ H ₅ ) Cl ₃ , and (nC _{4
H 9 O) TiCl 3, Ti} (OC 2 H 5) Br trihalide alkoxy titanium such as _{3; Ti (OCH 3) 2} Cl 2, Ti (OC 2 H 5) 2 Cl 2, (nC 4 H 5 O )
_{2 TiCl 2, Ti (OC 3} H 7) 2 dihalogenated alkoxy titanium such as _{Cl 2; Ti (OCH 3)} 3 Cl, Ti (OC 2 H 5) 3 Cl, (nC 4 H 9 O) 3 TiC
Examples thereof include monohalogenated trialkoxy titanium such as l and Ti (OCH ₃ ) ₃ Br. These may be used alone or as a mixture. Of these, it is preferable to use a high halogen content substance, and it is particularly preferable to use titanium tetrachloride.

The reaction product of the olefin polymerization catalyst carrier, the electron donor and the titanium compound are usually contacted at 20 to 200 ° C, preferably 50 to 150 ° C for 0.5 to 10 hours, preferably 1 to 5 hours. Just go.

Further, a polyolefin can be obtained by contacting an olefin with the olefin polymerization catalyst obtained from the solid contact component obtained as described above, the organometallic compound and the electron donor for polymerization.

There are various kinds of organometallic compounds, and there is no particular limitation. Examples of the metal contained in this organometallic compound include lithium, sodium, potassium, zinc, cadmium, and aluminum, and aluminum is particularly preferable. The compound containing aluminum, that is, the organoaluminum compound, is not particularly limited and has the general formula AlR ² tX
_The one represented by _3-t is widely used. R ² has 1 carbon
To 10 are alkyl groups, cycloalkyl groups or aryl groups, t is a real number between 1 and 3, and X represents a halogen atom such as chlorine or bromine. Specifically, trialkylaluminum such as trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum, trioctylaluminum, etc. and dialkylaluminum such as diethylaluminum monochloride, diisopropylaluminum monochloride, diisobutylaluminum monochloride, dioctylaluminum monochloride. Monohalides are preferred, and mixtures of these are also preferred.

The electron donor for polymerization is an organic compound containing oxygen, nitrogen, phosphorus or sulfur. Specifically, amines, amides, ketones, nitriles, phosphines, phosphoramides, esters, ethers, thioethers, thioesters, acid anhydrides, acid halides, acid amides, aldehydes , Organic acids, and the like.

More specifically, organic acids such as aromatic carboxylic acids such as benzoic acid and p-oxybenzoic acid; acid anhydrides such as succinic anhydride, benzoic anhydride and p-toluic anhydride; acetone, methyl ethyl ketone, Methyl isobutyl ketone,
C3 to C15 ketones such as acetophenone, benzophenone and benzoquinone; carbon number 2 such as acetaldehyde, propionaldehyde, octylaldehyde, benzaldehyde, tolualdehyde and naphthaldehyde
~ 15 aldehydes; methyl formate, methyl acetate, ethyl acetate, vinyl acetate, propyl acetate, octyl acetate, cyclohexyl acetate, ethyl propionate, ethyl acetate, ethyl valerate, methyl chloroacetate, ethyl dichloroacetate,
Methyl methacrylate, ethyl crotonate, ethyl pivalate, dimethyl maleate, ethyl cyclohexanecarboxylate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, octyl benzoate, cyclohexyl benzoate, phenyl benzoate, benzoate Acid benzyl, methyl toluate, ethyl toluate, amyl toluate, ethyl ethyl benzoate, methyl anisate, ethyl anisate, ethyl ethoxybenzoate, ethyl p-butoxybenzoate, ethyl o-chlorobenzoate, ethyl naphthoate , Γ-butyrolactone, δ-valerolactone, coumarin, phthalide, ethylene carbonate and the like having 2 to 18 carbon atoms; acetyl chloride, benzyl chloride, toluic acid chloride, anisic acid chloride and the like having 2 to 2 carbon atoms
15 acid halides; methyl ether, ethyl ether,
Ethers having 2 to 20 carbon atoms such as isopropyl ether, n-butyl ether, amyl ether, tetrahydrofuran, anisole, diphenyl ether, ethylene glycol butyl ether; acid amides such as acetic acid amide, benzoic acid amide, toluic acid amide; tributylamine, N , N'-Dimethylpiperazine, tribenzylamine, anilines, pyridines, picolines, amines such as tetramethylethylenediamine, nitriles such as acetonitrile, benzonitrile, tolunitrile; tetramethylurea, nitrobenzene, lithium butyrate, etc. You can Of these, preferred are esters, ethers, ketones, acid anhydrides and the like. In particular, alkyl esters of aromatic carboxylic acids such as benzoic acid, p-methoxybenzoic acid, p-ethoxybenzoic acid, and toluic acid having 1 to 4 carbon atoms.
Are preferred, and aromatic ketones such as benzoquinone, aromatic carboxylic acid anhydrides such as benzoic anhydride, and ethers such as ethylene glycol butyl ether are also preferred.

This electron donor for polymerization may be the same as or different from the electron donor used in the preparation of the solid catalyst component.

As the composition of each component of the olefin polymerization catalyst, usually,
Regarding the solid catalyst component, the titanium concentration is 0.001 to 1 mm.
ol, the organometallic compound has a metal / titanium atomic ratio of 1 to 1000, preferably 5 to 500, and the polymerization electron donor has a polymerization electron donor (mol) / The titanium (atomic) ratio is 0.01 to 100.

The olefin that can be polymerized by the olefin polymerization catalyst is represented by, for example, R ³ —CH═CH ₂ (wherein R ³ is a hydrogen atom or an alkyl group or a cycloalkyl group having 1 to 20 carbon atoms). Examples thereof include ethylene, propylene, butene-1, pentene-1, octene-1, vinylcyclopentane and vinylcyclohexane, with ethylene and propylene being preferred.

As a method of polymerizing the olefin in the presence of the olefin polymerization catalyst, for example, a slurry polymerization method using an aliphatic hydrocarbon solvent, a bulk polymerization method, a gas phase polymerization method or the like can be adopted.

EFFECTS OF THE INVENTION According to the present invention, an oxide solid of at least one element selected from the elements belonging to Groups II to IV of the periodic table and / or a composite inorganic oxide containing at least one of these oxides Since the product is brought into contact with silicon halide and alcohols in this order, when titanium is supported on the obtained olefin polymerization catalyst carrier, the catalytic activity of titanium can be improved. Moreover, since the particle size characteristics of this olefin polymer are good, it is possible to prevent clogging accidents in the reactor, the transport pipe and the like.

EXAMPLES Next, the present invention will be described more specifically by showing examples of the present invention.

(Example 1) Preparation of catalyst support for olefin polymerization In a 0.5 l glass container purged with argon, 20 g of calcined silicon oxide (Fuji Davison, grade 952), 40 ml of dimethyldichlorosilane, and 100 ml of n-heptane were added. I put it in. The mixture was reacted under reflux with stirring for 5 hours. Thereafter, washing by decantation was repeated 3 times using 100 ml of n-heptane. Then, 100 ml of methanol was added, and the reaction was carried out under reflux for 1 hour. Wash by decantation with 100 ml of methanol 1
This was repeated and dried at 100 ° C for 1 hour to obtain a solid.

A solution of 4.5 g of diethoxymagnesium in 7.0 ml of tetra-n-butoxytitanium was added to 5.0 g of the solid matter, and the mixture was allowed to stand at room temperature for 30 minutes. Then, 20 ml of tetrachlorosilane was added dropwise over 1 hour. And after stirring for 1 hour at 80 ℃,
The decantation was repeated 3 times with 10 ml of n-heptane. After decantation, the catalyst support for olefin polymerization was obtained as a white solid by drying under reduced pressure at 80 ° C. for 1 hour.
This olefin polymerization catalyst carrier contained 4.6% by weight of magnesium atoms.

Preparation of solid catalyst component for olefin polymerization 5.5 g of a catalyst carrier for olefin polymerization obtained as described above
The mixture was placed in a 0.5 l glass container and 50 ml of n-heptane, 3.0 mmol of n-butyl benzoate and 35 g of titanium tetrachloride were placed. The mixture was stirred under reflux for 1 hour. Then, the supernatant was removed by decantation, and the obtained solid portion was sufficiently washed with hot n-heptane to obtain a solid catalyst component for olefin polymerization.

Polymerization of Propylene In an autoclave purged with argon, 0.02 mg atom (as titanium atom equivalent) of the solid catalyst component suspended in 300 ml of hexane, 1.0 mmol of triethylaluminum, and p
-0.40 mmol of methyl toluate were added. After depressurizing the inside of this autoclave to remove argon, 310 g of propylene and 0.7 Nl of hydrogen were charged into this autoclave. After 5 minutes, the temperature was raised to 70 ° C, and polymerization was carried out at 70 ° C for 2 hours.

After cooling the autoclave, propylene was purged and the contents were taken out. Dry the contents under reduced pressure to 28
5 g of polypropylene powder was obtained. Table 1 shows the ratio (II) of the boiling n-heptane extraction residual polymer of this powder, the catalytic activity per titanium atom, and the bulk density of polypropylene.

(Examples 2 to 5) The same procedure as in Example 1 was performed except that the type of silicon halide and the type of alcohol were changed.

Table 1 shows the ratio (II) of the boiling n-heptane extraction residual polymer of the obtained polymer, the catalytic activity per titanium atom, and the bulk density of polypropylene.

(Comparative Example 1) The same operation as in Example 1 was performed except that the alcohol treatment was not performed.

The results are shown in Table 1.

(Comparative Example 2) In the preparation of the catalyst carrier for olefin polymerization, the procedure of Example 1 was repeated except that the magnesium alkoxide in the next step was further added without performing washing, drying and separating operations after the treatment with methanol.
The same operation was performed.

The results are shown in Table 1.

[Brief description of drawings]

FIG. 1 is a flowchart of the method for producing a catalyst carrier for olefin polymers according to the present invention.

Claims (2)

[Claims] 1. A method for producing a catalyst carrier for olefin polymerization obtained from an oxide of at least one element selected from elements belonging to Groups II to IV of the periodic table and a magnesium compound, comprising: Oxide solid of at least one element selected from the group IV elements and /
Alternatively, a solid inorganic substance obtained by bringing a composite inorganic oxide containing at least one of these oxides into contact with silicon halide and alcohols in this order, and then separating them, and a hydrocarbon, an electron donor and alkoxytitanium. A method for producing a catalyst carrier for olefin polymerization, which comprises contacting a magnesium alkoxide-containing liquid, which is a mixture of at least one selected from the group and magnesium alkoxide. 2. The magnesium alkoxide-containing liquid,
The method for producing a catalyst carrier for olefin polymerization according to claim 1, which is a mixture of alkoxytitanium and magnesium alkoxide.