JPS62227432A - Agitator - Google Patents

Abstract

PURPOSE:To uniformalize residence time of fine particles by fixing a fixed weir vertically to a revolving shaft and to provide paddle units adjoining with said fixed weir between to satisfy specific conditions in a lateral single shaft agitator equipped with a plurality of paddle units on the revolving shaft. CONSTITUTION:A plurality of paddle units, consisting of more than one paddle respectively, are provided on a horizontal revolving shaft in a lateral cylindrical container to form up an agitator means. More than two of fixed weirs are fixed in the positions to divide the length of container roughly in an equal length and to the vertical direction of the shaft, remaining semicircle openings upward inside the inner wall of container. By said arrangement, the inside of the container is divided into a plurality of agitating zones, the number of which is one more than that of said fixed weirs. Respective two paddle units adjoining with the fixed weir between should be arranged to satisfy the formulas i-v, and also formula vi should be satisfied between adjoining two paddle units.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stirring device. For more details,
A horizontal cylindrical container has a built-in stirring means in which a number of paddles are attached to a rotating shaft, and two or more fixed weirs are fixed to the peripheral wall of the container perpendicularly to this rotating shaft. The attachment of adjacent paddles is specially configured and polymerization vessel.

This invention relates to a horizontal uniaxial stirring device suitably used as a post-processor, a dryer 1, etc.

[Conventional technology]

A stirring device in which a horizontal uniaxial stirring means is built into a horizontal cylindrical container has long been known as a stirring device for polymer particles such as polyolefin. The purpose of these stirring devices is to completely mix polymer particles, catalyst particles, etc. (hereinafter sometimes referred to as powder and granules), improve heat removal efficiency, and further improve the retention of powder and granules in a container. Time distribution (hereinafter referred to as R
In order to narrow the width of the TD (sometimes abbreviated as TD) or equalize the residence time (hereinafter sometimes referred to as improving RTD), a rectangular flat paddle is placed on a horizontal rotation axis. In addition to a large number of horizontal uniaxial stirring means attached to a container, a stirring device capable of continuous processing is known in which one or more fixed weirs are fixed to the inner wall of the container in a direction perpendicular to the rotation axis (Tokuko Sho et al. 59-21321).

[Problem that the invention seeks to solve]

However, in a stirring device in which this type of fixed weir is simply installed in addition to conventional stirring means to constitute each stirring zone (hereinafter sometimes simply referred to as zone) separated by the fixed weir, it is difficult to mix. Alternatively, even if there was an improvement in heat removal efficiency, a sufficient improvement in RTD could not be obtained. Now, regarding an agitation device that has two fixed weirs and three zones, in one zone, after the powder is stirred for the average residence time in that zone, it is transferred to the next adjacent zone. Assuming that the entire amount is transferred by piston flow, that is, that each zone is sequentially transferred in batch operation, the greater the number of zones, the greater the stirring effect. This effect is called the tank number effect, and if the effect of the number of tanks for one zone on this effect is 1, and the total number of tanks effect is expressed as the sum, then in the case of three zones as above, the total The tank number effect is 3.
It is. However, when the above-mentioned conventional stirring device, which is simply equipped with a fixed weir in addition to the conventional stirring means, is operated continuously, short-pass particles and long-term residence particles exist in each zone, and the effect of the number of tanks is limited to the zone 1. The number is less than 1 in half, and the total number is less than 3. Furthermore, when the rotation speed is increased in an attempt to achieve complete mixing, the powder and granules become in a fluid state, and even though two fixed weirs are installed, the particles exceed the fixed weir from both sides. In many cases, the overall effect of the number of tanks approached 1, and the effect of installing a weir was hardly noticeable.

As described above, the conventional stirring device in which a fixed weir is simply installed in addition to the conventional stirring means has a problem in that it is very difficult to improve the RTD of powder and granular material. For example, the presence of short-pass particles in stirring equipment for olefin polymerization or polyolefin drying causes non-uniform quality, deterioration of physical properties, poor appearance, etc. in the obtained polyolefin, so the above-mentioned conventional technology It was hoped that the problems would be resolved as soon as possible.

[Means for solving problems]

The present invention solves the problems of the prior art as described above, and provides a horizontal uniaxial type that can stably perform continuous stirring for a long period of time on an industrial scale while maintaining a uniform residence time of powder and granules. This was achieved as a result of intensive research with the aim of providing a stirring device.

That is, the present invention provides a horizontal cylindrical container having a supply port for the material to be stirred at one end and an outlet for the powder or granular material at the other end, and one or more sheets at each of a plurality of positions on the horizontal rotation shaft. A horizontal uniaxial stirring device having a built-in stirring means consisting of a plurality of paddle sets each having rectangular flat paddles attached thereto; The inside of the container is divided into three or more stirring zones by two or more fixed weirs, and adjacent paddle group groups consisting of two adjacent paddle groups with each fixed weir in between meet the following conditions ( A stirring device characterized by satisfying i) to (V) and satisfying condition (vi) between adjacent paddle sets; (i) The width W and number of paddles of the two paddle sets are equal to each other.

(ji) β=0°, (ni) D/100≦Q1≦D/20, (iv) Q
, /Q□≧1 (v)1≦527S1≦20 (vi) Q1 between all adjacent paddle groups, α.

S1 and S2, S2 and W are each equal to each other.

It is related to.

[Configuration description] The stirring device according to the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a side explanatory view schematically and transparently showing one embodiment of the device of the present invention, and FIG. 2 is a diagram showing each of two adjacent paddle groups (adjacent paddle groups) in FIG. 1 with a fixed weir in between. Fig. 3 is an explanatory diagram viewed in the direction of the arrow from line A-A indicating the position of the paddles. Figure 4 is an explanatory diagram showing the state in which the adjacent paddle set is rotated by 90 degrees from the state shown in Figure 3, and Figure 5 shows the height of the powder and granule accumulation surface that changes as the paddle set rotates when stirring the powder and granule. Figures 6 and 7 are explanatory diagrams showing the changes in height of the powder accumulation surface near the fixed weir when stirring the powder, respectively, in two extreme cases corresponding to Figures 3 and 4. 8, 9, and 10 are side explanatory views showing the positions of the paddle sets, and various aspects of the arrangement of the fixed weir and the adjacent paddle sets in the device of the present invention, and the powder and granular materials. FIG. 3 is an explanatory side view showing the formation state of a deposition surface.

In the drawing, 1 is a horizontal cylindrical container (diameter and length).

L/D=3.0), as shown in FIG.
It has a supply port 2 for the material to be stirred at one end and a discharge port 3 for the powder and granular material at the other end. A horizontal rotating shaft (diameter d) 4 is provided at the cylindrical axis position in this horizontal cylindrical container (hereinafter sometimes simply referred to as a container) 1, and a horizontal rotating shaft (diameter d) 4 is provided at each of a plurality of positions on this rotating shaft 4. As shown in Figures 1 and 2, one or more rectangular flat paddles (width W
) A plurality of paddle sets 5 are provided along almost the entire length of the rotating shaft 4, and together with the rotating shaft 4 constitute a stirring means. This stirring means and the container 1 containing it constitute a horizontal uniaxial stirring device. The number of paddles in each paddle group 5 is two in the illustrated example, but
This is not necessarily necessary, and paddle sets 5 made up of different numbers of paddles, such as one, two, or three, may coexist. However, as will be described later, it is necessary that the number of paddles be equal between two adjacent paddles across each fixed weir.

7 is a fixed weir, and as shown in FIG. 1 and FIG. At the position where it is divided into
A half-moon shape (consisting of an arc and a chord,
The fixed weir 7 divides the inside of the container 1 into one more stirring zone than the number of fixed weirs 7 (hereinafter referred to as The above-mentioned stirring zones may be referred to as a first zone, a second zone, a third zone, etc. in order from the supply port 2 side to the extraction port 3 side.
(The stirring zones on the side and the outlet 3 side may be referred to as the upstream zone and the downstream zone, respectively).

By the way, in the device of the present invention, two paddle groups that are adjacent to each other with the fixed weir 7 in between (each may be referred to as an adjacent paddle group, and both adjacent paddle groups that sandwich one fixed weir 7 are collectively referred to as an adjacent paddle group). (referred to as group 9), that is, the adjacent paddle group 5a located on the supply port 2 side (upstream side) and the adjacent paddle group 5b located on the extraction port 3 side (downstream side),
Conditions (i) to (v) shown above for each adjacent paddle set group 9
It is a feature of the present invention that the condition (vi) is satisfied between adjacent paddle sets.

The horizontal cylindrical container 1 used in the apparatus of the present invention preferably has a ratio L/D of length L to diameter of 1.0 or more. Further, it is preferable that the area of the opening 8 of the fixed weir 7 is not larger than 30% of the cross-sectional area of the container +πD. The shape of the opening 8 is basically preferably a half-moon shape as shown in FIG. 2, but there is no particular restriction other than that the arc of the container peripheral wall is included as part of the periphery of the opening 8.

[Effect]

The operation of the device of the present invention will be explained below along with the history of development of the device of the present invention.

Even in the case of a horizontal uniaxial stirring device in which two or more fixed weirs 7 are provided, each adjacent paddle group 9 has an adjacent paddle group 5.
If the above conditions (i) to (v) for a and 5b are not satisfied, for example, if the numbers of paddles in both adjacent paddle sets 5a and 5b are different, or even if they are the same, both adjacent paddle sets 5a and 5b The phase angle difference β of at least some of the paddles is O
o (in the former case, the phase angle difference of the paddles is naturally the same as in the latter case), the flow pattern in the axial direction in which the powder and granules pass through the opening 8 above the fixed weir 7 is one-sided. In some cases, the powder scraped up by the paddle set 5b on the downstream side moves in the opposite direction, beyond the fixed weir 7. At the opening 8 above the fixed weir 7, if the granular material only moves from the upstream zone to the downstream zone, the effect of the number of tanks will appear to some extent, but under the above conditions (i) to (v)
If this is not satisfied, there is also a reverse movement from the downstream zone to the upstream zone, and the amount of powder and granular material moving from the upstream zone to the downstream zone increases by the amount of this reverse movement, increasing the short path. This makes the residence time uneven. Also, the amount of reverse movement per unit time increases as the rotation speed increases,
In extreme cases, even if two or more fixed weirs 7 are installed internally, the effect will hardly be seen.

The results of various studies regarding these phenomena will be explained in detail with reference to FIGS. 3 to 7. Although the following explanation is about one adjacent paddle set group 9, it is applicable to any of two or more adjacent paddle set groups 9. Both adjacent paddle sets 5a and 5b sandwiching the fixed weir 7 shown in FIG.
, the number of paddles is the same, two, and the paddles 6a and 6a of the adjacent paddle group 5a in each of the adjacent paddle groups 5a and 5b.

The opening angle α° between the paddles 6b and 6b of the adjacent paddle set 5b is both 180°.
There is a phase angle difference β between two sets of paddles 6a and 6b between a and 5b, but in the above example, the phase angle difference β is not Oo, and both sets are 90@. .

These paddle sets 5a, 5b are rotated 90° from the position shown in FIG.
When rotated, it will be in the position shown in Figure 4. Generally, when the paddle set 5 is rotated while the stirring device holds an appropriate amount of powder or granules (often about 60% by volume of the device), the slope of the surface on which the granules are deposited changes. The height of the top-band varies up and down. The state of change differs depending on the nature of the powder, the number of revolutions, the amount held, etc., but the paddle set 5 reaches the angle of repose approximately in the vicinity of the rotational position shown in FIG. is at the highest level (denoted by HL). Furthermore, the paddle set 5 has an opening angle α of + from the rotational position shown in FIG.
When rotated (90° in the illustrated example) (the rotational position of the paddle set 5 is not shown), the top band of the powder deposition surface becomes the lowest level (represented by LL), and the paddle set 5 However, in the middle of the above two rotational positions, the top band of the powder deposition surface is at the average level (denoted by AL) between HL and LL. Therefore, the level of the top band of the powder material accumulation changes as follows during rotation of the paddle set 5: HL→AL−+LL+AL→HL. Here, as shown in FIGS. 3 and 4, the above results are based on the case where the phase angle difference β between adjacent paddle strings is 90° and the phase angle difference between other mutually adjacent paddle strings is also 90°. When examined, as shown in FIGS. 6 and 7, when the top band of the powder accumulation surface of one of the adjacent paddle sets 5a, 5b on both sides of the fixed weir 7 is at the level HL, the other The level of the top band of the powder/grain material deposition surface in the area of the adjacent paddle set 5a or 5b is always LL.

Therefore, when the rotating shaft 4 is continuously rotated to stir the powder or granular material, the adjacent paddle sets 5a and 5b come to the position shown in FIG. 3 (the adjacent paddle set 5a is in the same position as the paddle set 5 in FIG. 5). At this time, as shown in FIG. 6, the top band of the powder/granular material accumulation surface in the adjacent paddle group 5a area is at level HL, and the top band of the powder/granular material accumulation surface in the adjacent paddle group 5b area is at level LL. It is in. Since the granular material moves in the axial direction from the high level HL to the low level LL direction, in the case of Fig. 6, the granular material naturally moves over the fixed weir 7 from the upstream zone to the downstream zone. do.

When the rotating shaft 4 further rotates and the adjacent paddle sets 5a and 5b come to the position shown in FIG. 4, as shown in FIG. The level of the top band is reversed as shown in FIG. 7. HL and LL are reversed, and the powder material moves backward from the downstream zone to the upstream zone over the fixed weir 7.

In the above example, the reverse development of levels HL and LL occurs at equal time intervals due to the relationship between the phase angle difference β and the paddle opening angle α, but even when it occurs at unequal intervals, the movement state of the powder and granules may be affected. are basically the same.

In this way, adjacent paddle sets 5a, 5 with the fixed weir 7 in between
b When the height of the top-band level is alternately reversed between the powder accumulation surfaces in each region, a reverse movement phenomenon of the powder necessarily occurs, and long-term residence particles on the - side and short-pass particles on the other side. It was found that a large amount of water was generated, making the residence time uneven. As a result of further studies to reduce this reverse movement phenomenon, it was found that the level of the top band of the surface of the granular material piled up by the paddles 6a and 6b of the rotating adjacent paddle sets 5a and 5b is the same. It has been realized that it is important to arrange the paddles 6a and 6b so that they are the same at the same time and do not cause any difference. The conditions for this are that the paddles 6a and 6b of the adjacent paddle sets 5a and 5b are rectangular with the same width W, and as shown in FIG.
Clearances Q1 and Q2 (Q in Fig. 8,
, Q2 are the clearances between the tips of the paddles 6a, 6b and the inner wall of the container, viewed slightly diagonally, so only their positions are shown. The same applies to FIGS. 9 and 10. ) are equal, and the clearances S and S2 with respect to the fixed weir 7 are also equal, and it was found that the conditions shown below are the basic conditions for equalizing the residence time.

(i) Paddles 6a, 6 between both adjacent paddle sets 5a, Sb
The numbers of b are equal.

(ii) Each paddle 6a between both adjacent paddle sets 5a and Sb,
The phase angle difference β of 6b is 0°.

Condition (3i) is, in other words, one adjacent paddle set 5a.

This means that the two paddles 6a and 6b, which are composed of one each of paddles 6a and 6b of 5b, coincide as shown in Fig. 2 when viewed in the direction of the rotation axis 4, but the opening angles α are not necessarily equal. does not require In this case, both adjacent paddles [5a,
No matter where the level of the top band of the surface of the powder/grain material accumulation in each region 5b is in any state from HL to LL, for example, as shown in FIG. 8 in the case of HL.

Unless the powder is supplied from the supply port 2 and flows into the upstream zone, the slope of the powder accumulation surface at the opening 8 above the fixed weir 7 is the same on both sides of the fixed weir 7, and Matsue is balanced. The trough P' where the slopes on both sides intersect is formed directly above the fixed weir 7 and is on the upward extension surface P of the fixed weir 7, so that movement of powder and granules over the fixed weir 7 does not occur. However, in such an arrangement of the fixed weir 7 and the adjacent paddle sets 5a and 5b, when the powder is supplied from the supply port 2 and flows into the upstream zone, only the increase in the upstream zone is small. This results in a level difference, and the granular material exhibits a flow pattern that only moves from the first zone to the second zone.

Next, paddles 6a and 6 are inserted between both adjacent paddle sets 5a and 5b.
Even if the number of plates b is equal and the phase angle difference β is Oo, if the area of the opening 8 of the fixed weir 7 is large, the number of rotations is high, or the amount of powder and granules held is large, etc. The degree of scattering of the powder particles in the axial direction increases, and prevention of short paths and reverse movement due to scattering is not necessarily sufficient. As a result of various studies on preventing such scattering or reverse movement, we found that the widths W of the paddles 6a and 6b of both adjacent paddle sets 5a and 5b are the same (this condition will not be changed in the following explanation). )
.

It was found that the prevention effect was sufficient when Q2/Ω≧1 and S t /S 1≧1. Q2/Q1=
The case of 1°S, /51=1 is as seen earlier in FIG. If Q2/n,>'J-,S,/5i=1, the ninth
In the figure, if Ω2/Ω, = l, S2/S, > 1, the first
Figure 0 shows the state of formation of the top-band on the surface of the powder and granular material, respectively. In both FIGS. 9 and 1O, the trough P' formed by the contact between the powder and granule accumulation surfaces of both adjacent paddle sets 5a and 5b is on the downstream side of the upper extension surface P of the fixed weir 7. It is located on the zone side, and the existence of an axial distance Hs between the trough P' and the plane P is recognized. The presence of this distance Hs on the downstream zone side means that the matsue in plane P is directed from the upstream zone to the downstream zone, and the larger Hs is, the harder it is for the powder and granules to move back.

Next, we empirically determined through a number of experiments the range in which Ql should be practically set relative to the inner diameter of the container 1, and found that the appropriate range for Ω was (iii) D/100
It was found that ≦Q1≦D/20.

Also, the larger the S2/S work is, the more effective it is in preventing reverse movement, but on the other hand, if it is too large, the clearance S2
The state of agitation of the powder and granular material in the agitator deteriorates, and if the agitation is severe, dead space results. Regarding this point as well, it has been empirically determined that (V)1≦S2/S□≦20 is an appropriate range.

Even if the above conditions (i) to (v) are satisfied for each adjacent paddle set group 9, between the adjacent paddle set groups 9, Qi and Q22
When both, S1 and S2, and W are different from each other,
An unbalance occurs in the moving speed of the powder and granules between stirring zones, causing the particles to become unevenly distributed, causing problems and making the effect of preventing the reverse movement of the powder insufficient. Condition (vi) to ensure that the levers are equal is set.

The stirring device according to the present invention was constructed as described above.

Next, as a result of conducting further studies on nz/nz and S 2 / S, we found that (iv) 1≦Q 2 / Q 1≦3 (v) 1≦S, /S, ≦12 For stirring powder and granules with a relatively narrow particle size distribution, and (iv) Q2/Q1=1 (v) 1≦82/S1≦3, in addition to the above powder and granules, powder with a shape close to spherical can be used. Each of these was found to be particularly suitable for stirring granules.

〔how to use〕

The use of the device of the present invention is not particularly limited, but may have 2 to 6 carbon atoms.
A gas phase polymerization apparatus for gas phase polymerization of α-olefin together with a catalyst containing a transition metal compound.

A gas phase reactor as a post-treatment device after gas phase polymerization.

It is preferably used as a polymer drying device 2 or the like.

In this way, when carrying out gas phase polymerization of olefins using the apparatus of the present invention, for example, the Froude number (
Fr) ranges from 0.05 to 3.0, preferably from 0.2 to
It is best to rotate it so that it is within the range of 2.0.

Fr=Rω2/g where R: Length from the center of the rotation axis to the tip of the paddle, ω: Angular velocity (=2πN, N is the rotational speed rps) g: Gravitational acceleration Also, the amount held in the container is 10 to 80% by volume. , it is preferable to carry out continuous treatment. In this case, it is preferable that the retention levels in each zone be equal, or that the retention level in the downstream zone be slightly lower than that in the upstream zone, in order to further ensure prevention of reverse migration.

When the object to be stirred is a polymer, examples of the types include ethylene polymer, propylene polymer, butene polymer, ethylene-propylene copolymer, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, propylene-butene-1-ethylene copolymer, etc. can be given.

〔effect〕

If the stirring device according to the present invention is used, two or more fixed weirs are provided to increase the number of stirring zones, and each adjacent paddle set group is specially configured to prevent short-circuiting of polymer particles, etc.
The pass amount can be extremely reduced to make the residence time of powder and granules uniform, and despite continuous polymerization or continuous processing, the RTD of powder or granules is the same as that of batch polymerization or batch processing.
TD can be approximated and therefore the quality of the stirred object.

Physical properties etc. can be improved.

[Example, comparative example]

Hereinafter, the present invention will be specifically explained with reference to Examples and Comparative Examples.

Example 1. Comparative Examples 1 to 3 Inner diameter is 430Ωm, length L is 1320mm (L/D
= 3) The apparatus of the present invention has various embodiments in which a paddle with a width W of 40 m++ is attached to a rotating shaft with a diameter d of 110 m in a horizontal cylindrical container, and the presence or absence of a fixed weir or the attachment of the paddle differs depending on the embodiment. Using a horizontal uniaxial stirring device outside the scope of the invention, the median diameter was 5 oop and the bulk density was 0.5 g/
Continuously feeding polypropylene inert powder with a relatively narrow particle size distribution of ci at 15 kg/hr while rotating at 6 Orp.
Continuous stirring was carried out at m (Fr=0.826), and the amount of powder held during steady operation was maintained at 60% by volume of the apparatus capacity. In this case, since the actual volume of the device is 179Ω, the average residence time φ
is 3.58 hours (215 minutes).

During this steady operation, 270 g of colored powder of the same polypropylene as a tracer (equivalent to 0.5% by weight of the amount held) was injected into the powder supply port in an impulse manner.

The concentration of the tracer in the extracted polymer was measured over time at the extraction port of the powder and granular material, and its change (hereinafter sometimes referred to as impulse response) was investigated.

Using this impulse response, the uniformity of the residence time of the powder in each Example and Comparative Example was investigated.

Example 1 An area of 1 is provided at each position that divides the length L of the container into approximately 4 equal parts.
Three fixed weirs of the same shape are installed inside, leaving a half-moon-shaped opening of 40aJ above, and all paddle sets have two paddles and the opening angle α is 180'. In each divided zone, the phase angle difference of the paddles between adjacent paddle strings is 90', the clearance Q between the inner wall of the container and the tip of each paddle is all 5.0 mm, and the paddle strings are adjacent to each other with each fixed weir in between. In each of the three adjacent paddle group groups consisting of both adjacent paddle groups, Q = 122 = 5.0 mm (U2/Q
1=1. D/100 (=4.3) −J2□<D/20
(=21.5)) Sl:S2:8. ho (Therefore, S, /S, = 1) For the device of the present invention where β = 0°.

Comparative Example 1 A stirring device similar to Example 1 except that it does not have a fixed weir and the phase angle difference between the paddles in all mutually adjacent paddle arrangements is 90°.

Comparative Example 2 A case of the same stirring device as in Example 1, except that β = 90° in both adjacent paddle spacings of any adjacent paddle group.

Comparative Example 3 In each of the second and third adjacent paddle set groups counting from the upstream side, the number of paddles in the downstream adjacent paddle set is 3 and each opening angle α is 120°, and the upstream side There is no paddle for which β = 0'' for one paddle with the adjacent paddle group, but β = 0'' for the other paddles (therefore, each adjacent paddle group matches when viewed in the rotational axis direction) There is only one set of paddles, and in the third and fourth zones, the paddle phase angle difference between the adjacent paddle set on the downstream side of the fixed weir and the adjacent paddle set on the downstream side is not necessarily 90°. In the case of a stirring device similar to that of Example 1 except for the following.

The impulse response is shown as the change in the tracer concentration function e/ea with respect to the sampling time function t/φ.

Here, t is the elapsed time (sampling time) from the injection of the tracer until sampling at the powder outlet, that is, the actual residence time of the tracer in the container.

φ is the average residence time, e is the tracer concentration (wt%) at 7 o'clock at the powder outlet, and e is the tracer concentration relative to the amount of tracer input to the amount of polymer held in the container.

In general, when t/φ is about 0.2 or less, the larger e/ea is, the more short paths there are, and the more the peak value of e/ea is in a region where t/φ is relatively large, the more short paths there are. The number tends to decrease.

From Table 1, of course there is Comparative Example 1 which does not have a fixed weir, but Comparative Example 2 which simply has two or more fixed weirs installed inside.
Compared to this, in Example 1, where the paddle phase angle difference β between coarse adjacent paddles in each adjacent paddle set group is all 0'', the short path portion is overwhelmingly small, and the residence time of the powder is It can be seen that the is uniform.Also, from Comparative Example 3, there is no effect when there is one or more adjacent paddle group groups in which only a part of the paddles between both adjacent paddles has β=Oa. I understand.

Examples 2 to 4 Example 2 In the adjacent paddle group on the downstream side of each adjacent paddle group, Q,
2=15.0IIIl (therefore az/atechnique=3)
In the case of the device of the present invention which is the same as in Example 1 except that.

Example 3 S in the adjacent paddle group on the downstream side of each adjacent paddle group
, = 24.0 strokes (therefore, S, /S stroke = 3).

Example 4 In the adjacent paddle group on the downstream side of each adjacent paddle group, Q,
=15. Ons, S, =24. Om+ (therefore Qz
/Q1>1 and S, /S1>1) In the case of the device of the present invention, which is the same as in Example 1.

The impulse response is shown in Table 2.

From the column of Table 2 and Example 1 of Table 1, Q, >Q.

(Example 2) or S is >81 (Example 3), it is more effective in making the residence time of powder grains uniform;
．． ) Q8 and sz>st (Example 4), it can be seen that there is a further synergistic effect.

Examples 5-7. Comparative Example 4 Example 5 Same as Example 1 except that in each adjacent paddle group, the number of paddles in each adjacent paddle group is 3 and the opening angle α is all 120° (therefore, the number of paddles in the paddle groups other than the above In the case of the device of the present invention with two sheets and an opening angle α of 1 go'.

Example 6 In each stirring zone, the number of paddles in the paddle groups other than the adjacent paddle groups is 3, the opening angle α is 120'', and the paddles are connected between adjacent paddle strings (excluding the spacing between both adjacent paddles). In the case of the device of the present invention, which is the same as in Example 5, except that the phase angle difference between is 60°.

Example 7 The same as Example 4 except that in each adjacent paddle layer group, each adjacent paddle group has three paddles and each opening angle α is 120° (therefore, all paddle groups other than the above have two paddles).
The opening angle α is 180′, and Q 2 = 15. Om
m, S2 = 24.0no) in the case of the device of the present invention.

Comparative Example 4 In each of the second and third adjacent paddle layer groups counted from the upstream side, the number of paddles and the phase angle difference β of both adjacent paddle groups are the same as in Comparative Example 3 (therefore, the number of paddles and the phase angle difference β of each of the adjacent paddle layers For one paddle in each adjacent paddle set of the group, β=0, but there are no other paddles for which β=0), and the other paddles are the same as in Example 7.

The impulse response is shown in Table 3.

From Table 3, in each stirring zone, when the number of paddles in each paddle group including adjacent paddle groups is 3 (Example 6), the effect of making the particle residence time uniform is the same as in the case of 2 paddles. Also, even if the number of paddles or the opening angle α of the adjacent paddle set is different from those of other paddle sets, as long as the former satisfies the conditions of the present invention (Example 5) 1. The above effects of the present invention. It turns out that there is.

Furthermore, from the comparison between Example 7 and Comparative Example 4, even if the relationship between Ql and Q2 and the relationship between Sl and 82 are set in the same preferable manner as in Example 4, both adjacent paddles are It can be seen that there is no effect when the phase angle difference β of the paddles in the coarse interval does not satisfy the conditions of the present invention.

Example 8 The same stirring device as in Example 1 was used as a gas phase polymerization vessel, and a monomer mixture of ethylene and propylene was introduced together with a catalyst at a polymerization pressure of 20 kg/d2 and a polymerization temperature of 60
Rotation speed 4Orpm under ℃ condition (Fr=0.367)
Continuous polymerization with continued stirring was carried out for a long period of time to produce an ethylene-propylene copolymer (ethylene content 12% by weight). The physical properties of the molded product obtained from this were good, especially the low-temperature impact resistance.

Example 9 Using the same stirring device as in Example 4 as a gas phase polymerization vessel, the same mixed monomers as in Example 8 were continuously polymerized for a long period of time under the same conditions to produce an ethylene-propylene copolymer. The physical properties of the thus obtained molded article, especially the low-temperature impact properties, were significantly improved and were comparable to the low-temperature impact properties of the ethylene-propylene copolymer obtained by batch polymerization.

[Brief explanation of drawings]

FIG. 1 is a side view schematically and transparently showing one example of the device of the present invention, and FIG.
A-A, I! indicates the position of each paddle in the paddle group (adjacent paddle group)! Figure 3 is an explanatory diagram of the adjacent paddle set viewed from the same position as Figure 2 when the phase angle difference of the paddles is 90°, Figure 4 is from the state of Figure 3. An explanatory diagram showing a state in which adjacent paddle sets are rotated by 90 degrees, FIG. 5 is an explanatory diagram showing the elevation of the powder/granular material accumulation surface that changes as the paddle sets rotate as they stir the powder/granular material, and FIG. Figure 7 shows the changes in height of the powder and granule accumulation surface near the fixed weir when stirring the powder and the positions of the paddle sets in two extreme cases corresponding to Figures 3 and 5 and 4, respectively. The side explanatory views, FIGS. 8, 9, and 10, show various aspects of the arrangement of the fixed weir of the device of the present invention and the adjacent paddle sets on both sides thereof, and the formation of the powder and granular material deposition surface. FIG. 1... Horizontal cylindrical container (container) 2...
Supply port 3... Outlet port 4... Rotating shaft 5... Paddle group 5a... Adjacent paddle group across the fixed weir (adjacent paddle group) Paddle set 5b on the supply port (upstream) side of the middle...Adjoining paddle group 6 on the extraction port (downstream) side of the coarse raw material...Paddle 6a...Adjacent paddle coarse material Paddle 6b of the paddle group on the raw raw material supply port (upstream) side...Adjacent paddle Paddle 7 of the paddle group on the coarse raw material outlet (downstream) side...Fixed weir 8... ... Opening 9 ... Adjacent paddle layer group D ... Container diameter d ... Rotating shaft diameter Hs ... Valley of powder deposition surface Axial distance L between the upper extension surface of the fixed weir and the upper extension surface of the fixed weir Length Q of the container Q Clearance between the inner wall of the container and the tip of the paddle Q Inner wall of the container Clearance Q2 between the tip of the paddle of the adjacent paddle group on the inlet (upstream) side and i Clearance AL between the inner wall of the container and the tip of the paddle of the adjacent paddle group on the outlet (downstream) side...・Top of powder/granular material accumulation surface - Average level HL of the band...Top of powder/granular material accumulation surface - Highest level of the band LL......Top of powder/granular material accumulation surface- Lowest level P of the band... Upper extension surface P' of the fixed weir... Valley Sl... Adjacent to the fixed weir and the supply port (upstream) side (
Clearance S2 between the paddles of the paddle group... Clearance W between the fixed weir and the paddle of the adjacent paddle group on the outlet (downstream) side... Paddle width α...・Opening angle β... Difference in phase angle between adjacent paddles Figure 2 Figure 3 Figure 4 Figure 55! I Fig. 6 No. 751 No. 81! i Procedural amendment April 18, 1986

Claims (1)

[Scope of Claims] 1. In a horizontal cylindrical container having a supply port for the material to be stirred at one end and a discharge port for the powder or granular material at the other end, a horizontal rotating shaft and a plurality of containers each located at each of a plurality of positions on the horizontal rotating shaft are provided. A horizontal uniaxial stirring device with a built-in stirring means consisting of a plurality of paddle sets each having one or more rectangular flat paddles attached thereto, the device being fixed to the inner wall of the container in a direction perpendicular to the rotation axis. was done 2
The interior of the container is divided into three or more stirring zones by the above fixed weirs, and adjacent paddle group groups consisting of two adjacent paddle groups across each fixed weir meet the following conditions for each adjacent paddle group group. A stirring device characterized by satisfying (i) to (v) and satisfying condition (vi) between adjacent paddle sets; (i) The width W and number of paddles of the two paddle sets are equal to each other. . (ii) β=0°, (iii) D/100≦l_1≦D/20, (iv) l
_2/l_1≧1 (v) 1≦S_2/S_1≦20 (vi) Between all adjacent paddle groups, l_1 and l_
2 are equal to each other, S_1 to each other, S_2 to each other, and W to each other. [Here, β: Phase angle difference between adjacent paddle sets across the fixed weir on a projection plane perpendicular to the rotation axis, D: Inner diameter of horizontal cylindrical container (mm), l_1: Clearance between the inner wall of the container and the tip of the paddle of the paddle set on the supply port side (mm), l_2: Clearance between the inner wall of the container and the tip of the paddle of the paddle set on the extraction port side (mm), S_1: Paddle of the paddle set on the supply port side Clearance between the paddle and the fixed weir (mm), S_2: Clearance between the paddle of the paddle set on the outlet side and the fixed weir (mm). ] 2 l_1 and l_2 have a relationship of (iv) 1≦l_2/l_1≦3, and S_1 and S_2 have a relationship of (v) 1≦S_2/S_1≦12 as described in claim 1. stirring device. 3. The stirring device according to claim 1, wherein l_1 and l_2 have a relationship of (iv) l_2/l_1=1, and S_1 and S_2 have a relationship of (v) 1≦S_2/S_1≦3. . 4. The stirring device according to claim 1, wherein l_1 and l_2 have a relationship of (iv) l_2/l_1>1, and S_1 and S_2 have a relationship of (v) 1<S_2/S_1≦20. . 5 The supply port of the horizontal cylindrical container supplies a mixture of a polymerizable monomer and a polymerization catalyst that is continuously polymerized in the gas phase inside the container and becomes powder by the time it reaches the first fixed weir. The stirring device according to any one of claims 1 to 4, which is a supply port for.