JPH06104682B2 - Method for drying titanium catalyst component - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is an olefin polymer or copolymer having excellent storage properties, transportability, and large bulk density (in the present invention, both are collectively referred to simply as a polymer). The present invention relates to a method for easily and stably preparing a solid titanium catalyst component for olefin polymerization, capable of producing Particularly, it relates to a drying method suitable for an ethylene polymerization catalyst component having a wide particle size distribution.

[Conventional technology]

The applicant has already disclosed in JP-A-55-135105 and JP-A-56-136805 that a highly active solid titanium catalyst component containing a small amount of liquid hydrocarbon can be treated as a powder having excellent storage and transport properties. Moreover, it has been clarified that it is suitable for producing a polymer having a large bulk density. Generally, in order to obtain such a catalyst powder, after the titanium catalyst component is prepared, it is washed with a low boiling point hydrocarbon solvent such as hexane, and then dried so as to remain in the desired amount of the catalyst component. Is the most convenient. However, in such a method, it is difficult to precisely adjust the amount of the hydrocarbon solvent to be left in the catalyst component, and it is necessary to constantly sample during the drying and perform the drying while checking the remaining amount. Further, in the titanium catalyst component containing such a low boiling hydrocarbon solvent, when a titanium catalyst component having a particle size distribution that is not sufficiently narrow is used, the optimum value of the residual amount is in a relatively narrow range, and therefore, due to volatilization or the like. Consideration was needed to avoid weight loss. In particular, for ethylene polymerization catalyst components having a wide particle size distribution, the bulk density of the produced polymer can be obtained by using the catalyst components stored in a slurry even when dried so that a small amount of a low boiling hydrocarbon solvent is contained. It was slightly inferior to that of the polymer.

[Problems to be Solved by the Invention]

From this viewpoint, the present invention investigated a drying method in which it is easy to control the residual solvent in the titanium catalyst component. As a result, they have found that the objective can be achieved by adopting the method described below. And the titanium catalyst component obtained by this improved method has little performance change due to solvent volatilization,
It was also found that the optimum range of residual amount of solvent can be expanded considerably. It was also confirmed that the titanium catalyst component thus obtained has a high activity and can produce a polymer having a large bulk density. In particular, it was found that a remarkable improvement was observed in the ethylene polymerization catalyst component having a wide particle size distribution.

[Means for solving problems]

According to the present invention, at least one selected from magnesium oxide, magnesium hydroxide, hydrotalcite, magnesium carboxylate and magnesium dihalide.
A titanium compound obtained by contacting a complex compound of a seed magnesium compound and an electron donor with a titanium halide compound which forms a liquid phase under reaction conditions, with or without pretreatment with a reaction aid, A solid titanium catalyst component for olefin polymerization containing magnesium and halogen as essential components, a high boiling liquid hydrocarbon having a boiling point of 120 ° C. or more was dissolved in an amount of 0.05 to 0.15 part by weight per 1 part by weight of the titanium catalyst component. Provided is a method for drying a titanium catalyst component, which comprises drying a low-boiling point hydrocarbon contained in the slurry by evaporating it from a slurry suspended in a low-boiling point hydrocarbon having 5 to 8 carbon atoms. It

In the present invention, the titanium catalyst component contains titanium, magnesium and halogen as essential components, and also various electron donors; aluminum, silicon, tin, boron,
Germanium, calcium, zinc, phosphorus, vanadium,
It may contain a metal or element such as manganese; a functional group such as an alkoxyl group, an allyloxyl group, or an acyloxyl group. These may be reacted by directly contacting a magnesium compound or a magnesium metal and a titanium compound, or they may be reacted in the presence of at least one compound of an electron donor or the other metal or element, Further, it can also be obtained by carrying out a pretreatment with an electron donor or at least one compound of the other metal or element and then reacting it.

The halogen / titanium molar ratio contained in the component is preferably greater than about 4, and the magnesium / titanium molar ratio is preferably greater than or equal to about 3, more preferably about 3.5 to about 50. Further, the titanium catalyst component usually does not substantially eliminate the titanium compound by simple means such as washing with hexane at room temperature. Although its chemical structure is unknown, it is believed that the magnesium atom and the titanium atom share a halogen and are firmly bonded. The titanium catalyst component may also be an organic or inorganic inert diluent such as LiCl, CaCO ₃ , BaCl ₂ , Na ₂ CO ₃ , SrCl ₂ , B.
₂ O ₃ , Na ₂ SO ₄ , Al ₂ O ₃ , SiO ₂ , TiO ₂ , NaB ₄ O ₇ , Ca ₃ (P
It may contain O ₄ ) ₂ , CaSO ₄ , Al ₂ (SO ₄ ) ₃ , CaCl ₂ , ZnCl ₂ , polyethylene, polypropylene, polystyrene and the like.

A good titanium catalyst component is halogen / titanium (molar ratio)
Is more than about 4, preferably about 6 to about 100, and the magnesium / titanium (molar ratio) is about 3 or more, preferably about 3.5.
To about 50, and those containing an electron donor, the electron donor / titanium (molar ratio) is about 10 or less, preferably about
0.2 to about 6, and the specific surface area is about 3 m ² / g or more, more preferably about 40 m ² / g or more, and further preferably about
It is 100 m ² / g or more. In addition, the X-ray spectrum of the titanium catalyst component shows amorphousness regardless of the starting magnesium compound, or is in a state of being significantly amorphized as compared with that of a usual commercial product of magnesium dihalide. Is desirable.

The titanium catalyst component of the present invention also preferably has an average particle size of about 1 to about 200μ, preferably about 3 to about 100μ. The shape is arbitrary, and may be a spherical shape, an elliptic shape, a granular shape, or an amorphous shape. The particle size distribution is arbitrary. Especially, the shape is not uniform and the uniformity is 4
When the present invention is applied to a titanium catalyst component for ethylene polymerization which has a relatively wide particle size distribution of more than 5, for example, 5.5 or more, the effect is large. The average particle size and the uniformity can be measured by a light transmission method in a state of being suspended in a liquid hydrocarbon before being dried. Specifically, in an inert solvent such as decalin or hexane
Particle size distribution is obtained by diluting the catalyst component to a concentration of around 0.01-0.5%, putting it in a measuring cell, and shining light on the cell to continuously measure the intensity of light passing through a liquid in a sedimented state with particles. Is measured and the average particle size is calculated. Further, the homogeneity represents the ratio of the particle size of the titanium catalyst component corresponding to 60 wt% to the particle size of 10 wt% of the titanium catalyst component in view of the small particle size.

There have already been many proposals for a method of producing the titanium catalyst component as described above. A few examples of these methods are briefly described.

(1) A method of directly contacting a titanium compound and a magnesium compound. For example, the adoption of mechanical co-disintegration means and the precipitation of reaction products from contact between solutions.

(2) The oxygen-containing magnesium compound or a complex compound of a magnesium compound and an electron donor is pretreated with a reaction aid such as an electron donor and / or an organoaluminum compound or a halogen-containing silicon compound, or without pretreatment. ,
It is reacted with a titanium halide compound which forms a liquid phase under the reaction conditions, preferably titanium tetrachloride.

(3) A titanium compound is reacted with the material obtained in (1) or (2).

(4) An electron donor and a titanium compound are reacted with those obtained in (1) and (2).

(5) In addition to those obtained in (1) and (2), an electron donor,
The titanium compound and the organoaluminum compound are reacted.

(6) The products obtained in (1) to (5) are halogenated.

(7) The product obtained in (1) to (6) is extracted and washed with a solvent.

In the present invention, examples of the magnesium compound used for preparing the titanium catalyst component include magnesium oxide, magnesium hydroxide, hydrotalcite, magnesium carboxylate, and magnesium dihalide produced by various methods. . The organoaluminum compound that may be used in the preparation of the titanium catalyst component may be appropriately selected from the organoaluminum compounds that can be used in the olefin polymerization described below.
Furthermore, examples of the halogen-containing silicon compound that may be used for the preparation of the titanium catalyst component include tetrahalogenated silicon, alkoxyhalogenated silicon, alkylhalogenated silicon, and halopolysiloxane.

Examples of titanium compounds used for preparing the titanium catalyst component include titanium tetrahalides, alkoxy titanium halides, allyloxy titanium halides, alkoxy titanium,
Examples thereof include allyloxy titanium, and titanium tetrahalide is preferable, and titanium tetrachloride is particularly preferable.

Further, electron donors that can be used for the production of titanium catalyst components include alcohols, phenols, ketones, aldehydes,
Examples thereof include oxygen-containing electron donors such as carboxylic acids, esters, ethers, acid amides and acid anhydrides, and nitrogen-containing electron donors such as ammonia, amines, nitriles and isocyanates.

More specifically, it has 1 to 18 carbon atoms such as methanol, ethanol, propanol, pentanol, hexanol, octanol, dodecanol, octadecyl alcohol, benzyl alcohol, phenylethyl alcohol, cumyl alcohol and isopropylbenzyl alcohol.
Alcohols of 6 to 20 carbon atoms which may have a lower alkyl group such as phenol, cresol, xylenol, ethylphenol, propylphenol, cumylphenol, nonylphenol and naphthol; acetone, methyl ethyl ketone, methyl isobutyl ketone C3 to C15 ketones such as acetophenone and benzophenone; acetaldehyde, propionaldehyde, octylaldehyde, benzaldehyde,
Aldehydes having 2 to 15 carbon atoms such as tolualdehyde and naphthaldehyde; methyl formate, methyl acetate, ethyl acetate, vinyl acetate, propyl acetate, octyl acetate, cyclohexyl acetate, ethyl propionate, methyl butyrate, ethyl valerate, chloroacetic acid. Methyl, ethyl dichloroacetate,
Methyl methacrylate, ethyl crotonate, cyclohexanecarboxylate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, octyl benzoate, cyclohexyl benzoate, phenyl benzoate, benzyl benzoate, methyl toluate, toluyl Ethyl acid, amyl toluate, ethyl ethyl benzoate, methyl anisate, ethyl anisate, ethyl ethoxybenzoate,
γ-butyrolactone, δ-valerolactone, coumarin,
C2 to C18 organic acid esters such as phthalide and ethylene carbonate, inorganic acid esters such as ethyl silicate; C2 to C15 acid halides such as acetyl chloride, benzoyl chloride, toluic acid chloride and anisic acid chloride Kinds; ethers having 2 to 20 carbon atoms such as methyl ether, ethyl ether, isopropyl ether, butyl ether, amyl ether, tetrahydrofuran, anisole, diphenyl ether; acid amides such as acetic acid amide, benzoic acid amide, toluic acid amide; Amines such as methylamine, ethylamine, diethylamine, tributylamine, piperidine, tribenzylamine, aniline, pyridine, picoline and tetramethylethylenediamine; nitric acid such as acetonitrile, benzonitrile and tolunitrile Kind; and the like.
Two or more kinds of these electron donors can be used.

After completion of the reaction, the titanium catalyst component obtained by the various methods as exemplified above can be purified by thoroughly washing with a liquid inert hydrocarbon. As the inert liquid hydrocarbon used for this purpose, n-pentane, isopentane, n-pentane,
Aliphatic hydrocarbons such as hexane, isohexane, n-heptane, n-octane, isooctane, n-decane, n-dodecane, kerosene; cycloaliphatic hydrocarbons such as cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane Benzene, toluene, xylene,
Examples thereof include aromatic hydrocarbons such as cymen or a mixture thereof.

In the present invention, the titanium catalyst component obtained as described above is dried by evaporating and removing the low-boiling hydrocarbons from a slurry prepared by suspending a small amount of the high-boiling liquid hydrocarbons in the low-boiling hydrocarbons. It is what makes me. Here, the low boiling point hydrocarbon is one that is easily removed by evaporation, and specifically, one having about 5 to 8 carbon atoms is used. These can be selected, for example, from those exemplified above. The amount used is sufficient to form a slurry, and is preferably as small as possible. The amount used is 1 to 30 ml, and more preferably about 2 to 20 ml per gram of the titanium catalyst component. .

On the other hand, the high-boiling liquid hydrocarbon has a boiling point of 120 ° C. or higher, preferably 150 ° C. or higher, which is hardly volatile or non-volatile, and examples thereof include liquid paraffin, dodecane, tetradecane, and hexadecane. Particularly preferred is fluid paraffin. The high-boiling liquid hydrocarbons will remain in the titanium catalyst component almost entirely when the low-boiling hydrocarbons are removed by evaporation, so the amount used is
The amount is 0.05 to 0.15 part by weight per 1 part by weight of the titanium catalyst component. If the amount is too small, it tends to be difficult to obtain a polymer having high bulk density when the titanium catalyst component after drying is used for olefin polymerization. On the other hand, if the amount is too large, there will be a problem in handling the catalyst component as powder. In addition, the suitable amount ratio is the kind of catalyst component,
It may vary slightly depending on the shape, grain size, etc.

The low-boiling point hydrocarbons can be easily removed by evaporation and / or heating. For example pressure 10 or
760mmHg, preferably 20 to 200mmHg, temperature 0
It is possible to employ conditions such as -80 to 80 ° C, preferably 10 to 50 ° C. The operation for removing low boiling hydrocarbons is preferably carried out to 0.07 parts by weight or less, particularly 0.04 parts by weight or less, per 1 part by weight of the titanium catalyst component.

〔The invention's effect〕

According to the above method, only by adjusting the addition amount of the high-boiling-point liquid hydrocarbon added first, even if the drying is performed for a longer time than necessary, the residual hydrocarbon amount does not significantly change and the catalytic performance A constant value is also obtained. That is, when used for slurry polymerization or gas phase polymerization of olefin, a polymer having high activity and high bulk density can be obtained.

The solid titanium catalyst component for olefin polymerization of the present invention is combined with an organometallic compound of a metal of Group I to III of the Periodic Table, particularly an organoaluminum compound catalyst component,
It can be advantageously used for the polymerization of olefins.

As such an organoaluminum compound, a compound having at least one Al-carbon bond in the molecule can be used. For example, (i) the general formula ▲ R ¹ _m ▼ AlL (OR ² ) _n H _p X _q ( wherein R ¹ and R ² are 15 to -C generally 1, preferably as examples of the hydrocarbon group of a hydrocarbon which may optionally be different from one in the same with each other in groups .R ¹ and R ² including four from 1 Can be an alkyl group, an alkenyl group, an aryl group, etc. X is halogen, m is 0 <m ≦ 3, and n is 0 ≦ n <.
3, p is a number 0 ≦ p <3, q is a number 0 ≦ q <3, and m + n + p + q = 3), (ii) a general formula M ¹ Al ▲ R ¹ ₄ ▼ (Where M ¹
Is Li, Na or K, and R ¹ is the same as the above), and a complex alkyl compound of a Group 1 metal and aluminum.

Examples of the organoaluminum compound belonging to (i) above include the following. General formula ▲ R ¹ _m ▼ Al (OR ² ) _3-m
(Wherein R ¹ and R ² are the same as above. M is preferably 1.5
It is a number of ≦ m ≦ 3. ) General formula ▲ R ¹ _m ▼ AlX _3-m (where
R ¹ is the same as above. X is halogen, m is preferably 0 <m
<3), the general formula ▲ R ¹ _m ▼ AlH _3-m (where R ¹ is the same as above, m is preferably 2 ≦ m <3), the general formula ▲
R ¹ _m ▼ Al (OR ² ) _n X _q (wherein R ¹ and R ² are the same as above.
Is halogen, 0 <m ≦ 3, 0 ≦ n <3, 0 ≦ q <3,
m + n + q = 3) and the like.

In the aluminum compound belonging to (i), more specifically, trialkyl aluminum such as triethyl aluminum and tributyl aluminum, trialkenyl aluminum such as triisoprenyl aluminum, diethyl aluminum ethoxide, dialkyl aluminum alkoxide such as dibutyl aluminum butoxide, In addition to alkylaluminum sesquialkoxides such as ethylaluminum sesquiethoxide and butylaluminum sesquibutoxide, partially alkoxylated alkylaluminum having an average composition represented by ▲ R ¹ _2.5 ▼ Al (OR ² ) _0.5 , diethyl Aluminum alkyl chloride, dibutyl aluminum chloride, dialkyl aluminum halogenide such as diethyl aluminum bromide, ethyl alkane Alkyl aluminum sesquihalogenides such as aluminum sesquichloride, butyl aluminum sesquichloride, ethyl aluminum sesquibromide, partially halogenated alkyl aluminum dihalogenides such as ethyl aluminum dichloride, propyl aluminum dichloride, butyl aluminum bromide, etc. Partially hydrogenated alkyl aluminum such as alkyl aluminum, diethyl aluminum hydride, dialkyl aluminum hydride such as dibutyl aluminum hydride, ethyl aluminum dihydride, alkyl aluminum dihydride such as propyl aluminum dihydride, ethyl aluminum ethoxy chloride, butyl Aluminum butoxycyclolide,
It is a partially alkoxylated and halogenated alkylalkoxy such as ethyl aluminum ethoxy bromide. Further, the compound similar to (i) may be an organoaluminum compound in which two or more aluminums are bound via an oxygen atom or a nitrogen atom. Examples of such compounds include (C ₂ H ₅ ) ₂ Al-OAl (C ₂ H ₅ ) ₂ , (C ₄ H ₉ ) ₂ AlOAl (C
₄ H ₉ ) ₂ , Can be exemplified. Examples of the compound belonging to (ii) above include LiAl (C ₂ H ₅ ) ₄ and LiAl (C ₇ H ₁₅ ) ₄ . Among these, it is particularly preferable to use trialkylaluminum or a mixture of trialkylaluminum and alkylaluminum halide.

Examples of olefins polymerized using the solid titanium catalyst component for olefin polymerization of the present invention include C _{2 to} C ₈ such as ethylene, propylene, 1-butene, 4-methyl-1-pentene and 1-octene. Olefin can be exemplified, and not only homopolymerization but also random copolymerization and block copolymerization can be performed. Further, upon copolymerization, a polyunsaturated compound such as a conjugated diene or a non-conjugated diene can be selected as a copolymerization component.

The polymerization can be performed in either the liquid phase or the gas phase. When the reaction is carried out in the liquid phase, an inert solvent such as hexane, heptane or kerosene may be used as the reaction medium, but olephine itself may be used as the reaction medium. In the case of liquid phase polymerization, the titanium catalyst component is converted to titanium atom of 0.0001 to 1.0 mmol and the organoaluminum compound is converted to aluminum atom of 0.1 to 50 per liquid phase.
It is preferable to keep it in millimoles so that the atomic ratio of aluminum atom / titanium atom is 1/1 to 1000/1.
A molecular weight modifier such as hydrogen may be used in the polymerization. Further, for controlling the stereoregularity of α-olefin having 3 or more carbon atoms, ether, ethylene glycol derivative such as ethylene glycol monomethyl ether, amine, sulfur-containing compound, nitrile, inorganic acid ester, organic acid ester, acid anhydride, ketone , Quinone, alcohol, etc. may be allowed to coexist. In particular, aromatic carboxylic acid esters such as benzoic acid, p-toluic acid, anisic acid, etc. may be coexistent with those similar to those exemplified for the preparation of the titanium catalyst component. Preferably. These may be used in the form of an addition reaction product with the organoaluminum compound or the aluminum halogen-containing compound. The effective amount of the compound used is usually about 0.01 to about 2 mol, and particularly preferably about 1 mol per mol of the organoaluminum compound.
It is from 0.1 to about 1 mol.

The olefin polymerization temperature is preferably about 20 to about 20 to about 250 ° C., more preferably about 50 to about 180 ° C.,
The pressure is preferably from atmospheric pressure to about 100 kg / cm ² , preferably about 2 to about 60 kg / cm ² .
It can be performed in any of a batch system, a semi-continuous system, and a continuous system. It is also possible to carry out the polymerization in two or more stages under different reaction conditions.

Next, an example will be described.

Example 1 [Preparation of powdery titanium catalyst component] 1 21 g of magnesium chloride in a glass autoclave
And 510 ml of hexane were added, and 77 ml of ethanol was further added dropwise over 30 minutes at room temperature with stirring and mixing, and the mixture was reacted at the same temperature for 30 minutes. Then, 74 ml of diethylaluminum chloride was added at room temperature and stirred for 30 minutes, and then 21 ml of TiCl ₄ was added at room temperature. Then, the temperature was raised to 80 ° C., and the reaction was carried out at 80 ° C. for 2 hours. Then, the temperature of the reaction solution was lowered to 50 ° C. and the supernatant of the reaction solution was washed 6 times with hexane.

The amount of the solid Ti catalyst component thus obtained was about 27 g.
And a suspension in which about 100 ml of hexane was present. 2.7 g of liquid paraffin was added to this suspension, and hexane in the autoclave was degassed with a vacuum pump so that the decompression degree was about 100 to 30 torr while stirring, while the jacket temperature of the autoclave was increased to about 40 degrees. did. After about 5 hours, most of the hexane was evaporated and a powdery Ti catalyst component was obtained. The uniformity of the powdery Ti catalyst component was 6.2.

[Ethylene polymerization]

In a 2 l autoclave, under a nitrogen atmosphere, sufficiently dehydrated and purified hexane 1 was put, and then 1.0 mmol of triethylaluminum and a slurry in which the powdery Ti catalyst component obtained by the above-mentioned preparation method was suspended in hexane were converted into Ti atoms. 0.02 mmol
After adding an amount equivalent to, the temperature was raised to 80 ° C and hydrogen 4.0 kg / cm
² , and then ethylene was continuously supplied for 2 hours so that the total pressure was 8.0 kg / cm ² G. The temperature during the polymerization was adjusted to 80 ° C.

After completion of the polymerization, a slurry consisting of an ethylene polymer and a hexane solvent was separated by filtration to obtain a solid ethylene polymer, which was dried. The dry ethylene polymer powder obtained was 231 g.
The apparent bulk density was 0.36 g / cm ³ .

Comparative Example 1 A powdery titanium catalyst component was prepared and ethylene was polymerized in the same manner as in Example 1 except that fluidized paraffin was not added. The results are shown in Table 1.

Comparative Example 2 A powdery Ti catalyst component having substantially the same hydrocarbon content as that of the powdery Ti catalyst component of Example 1 was prepared in Example 1 by adding no fluid paraffin and by varying the drying time. Polymerization of ethylene was carried out by the same method as in Example 1.

Comparative Example 3 The same operation as in Example 1 was performed except that the amount of the fluidized paraffin added in Example 1 was 0.6 g. The results are shown in Table 1.
Shown in.

Comparative Example 4 The same operation as in Example 1 was performed except that the amount of the fluidized paraffin added in Example 1 was 7.1 g. The results are shown in Table 1.
Shown in.

Example 2 [Preparation of powdery titanium catalyst component] To a glass reactor equipped with a 500 ml stirrer, 10 g of magnesium hydroxide and 200 ml of purified n-decane were added under a nitrogen atmosphere,
Then, with stirring at -20 ° C, diethylaluminum chloride
42 ml and a purified n-decane mixed solution were added over 1 hour. Thereafter, the temperature was raised to 80 ° C. over 1 hour, and the heating reaction was carried out at 80 ° C. for 2 hours.

The solid part was collected by filtration, and the solid part was resuspended in 200 ml of titanium tetrachloride. Then, the temperature was raised to 80 ° C. and the reaction was carried out for 2 hours. Then, the supernatant of the reaction solution was washed 6 times with hexane. The catalyst was dried on the scale of 1/5 of Example 1 of the present application.

[Polymerization of ethylene]

Polymerization of ethylene was carried out in the same manner as in Example 1 by using the powdery Ti catalyst component thus obtained. The results are shown in Table 2.
Shown in.

Comparative Example 5 The catalyst was dried in the same manner as in Example 2 except that liquid paraffin was not added in drying the catalyst in Example 2 described above.

Polymerization of ethylene was carried out in the same manner as in Example 1 by using the powdery Ti catalyst component thus obtained. The results are shown in Table 2.
Shown in.

Example 3 [Preparation of powdery titanium catalyst component] 4.76 g (50 mmol) of anhydrous magnesium chloride, 25 ml of decane and 23.2 ml of 2-ethylhexyl alcohol were added at 120 ° C. for 2 hours.
After heating reaction for a period of time to form a homogeneous solution, ethyl benzoate
2.3 ml was added. This homogeneous solution was kept at -20 ° C, and 100 ml of titanium tetrachloride was added dropwise thereto for 1 hour.

After keeping it under stirring at 90 ° C for 2 hours, the solid part was collected by filtration, resuspended in 100 ml of titanium tetrachloride, heated at 90 ° C for 2 hours, and then filtered. The solid substance was collected, thoroughly washed with purified hexane until no free titanium compound was detected in the washing liquid, and then the catalyst was dried on a 1/5 scale of Example 1.

[Polymerization of ethylene]

Polymerization of ethylene was carried out in the same manner as in Example 1 by using the powdery Ti catalyst component thus obtained. The results are shown in Table 2.
Shown in.

Claims (2)

[Claims] 1. Magnesium oxide, magnesium hydroxide,
Reaction conditions of a complex compound of at least one magnesium compound selected from hydrotalcite, magnesium carboxylate, and magnesium dihalide with an electron donor, with or without pretreatment with a reaction aid. The solid titanium catalyst component for olefin polymerization containing titanium, magnesium and halogen as essential components obtained by contacting with a titanium halide compound forming a liquid phase below has a high boiling point liquid hydrocarbon having a boiling point of 120 ° C. or more as described above. The low boiling point hydrocarbon contained in this slurry is evaporated and removed from the slurry suspended in the low boiling point hydrocarbon having 5 to 8 carbon atoms dissolved in an amount of 0.05 to 0.15 part by weight per 1 part by weight of the titanium catalyst component. A method for drying a titanium catalyst component, which comprises: 2. The method according to claim 1, wherein the solid titanium catalyst component for olefin polymerization has an average particle size of about 1 to about 200 μm and a homogeneity of about 5 or more.