JPH0333373B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a stirring device. More specifically, a horizontal cylindrical container has a built-in stirring means in which many paddles are attached to a rotating shaft, and a fixed weir is fixed to the peripheral wall of the container perpendicularly to this rotating shaft. The installation of the adjacent paddles across the polymerization vessel is specially configured.
The present invention relates to a horizontal uniaxial stirring device suitable for use as a post-processor, dryer, etc. [Prior Art] 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. As one of these stirring devices, it is used 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. In order to narrow the width of the time distribution (hereinafter sometimes abbreviated as RTD), that is, to make the residence time uniform (hereinafter sometimes referred to as improving RTD), the rectangular flat paddle is placed horizontally. In addition to horizontal uniaxial stirring means installed in large numbers on a rotating shaft, there is also known a stirring device capable of continuous processing in which one or more fixed weirs are fixed to the inner wall of a container in a direction perpendicular to the rotating shaft. There is (Tokuko Akira)
59-21321). [Problems to be Solved by the Invention] However, this type of fixed weir is simply added to the conventional stirring means and is internally installed in each stirring zone (hereinafter sometimes simply referred to as zone) separated by the fixed weir.
Even if mixing or heat removal efficiency could be improved with a stirring device consisting of only 1, a sufficient improvement in RTD could not be obtained. Now, regarding an agitation device that has one fixed weir inside and is configured with two zones, in one zone, after the powder is agitated 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 batch-operated and transferred sequentially, the greater the number of zones, the greater the stirring effect. This effect is called the tank number effect, and the tank number effect for one zone on this effect is 1,
If the overall tank number effect is expressed as the sum, in the case of two zones as described above, the total tank number effect is 2. 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 zone 1.
The number is less than 1 in parts, and the number does not reach 2 in total. Furthermore, when the rotational speed is increased in an attempt to achieve complete mixing, the powder and granules become fluid and the amount of material that exceeds the fixed weir from both sides becomes fluid even though one fixed weir is installed. In many cases, the overall effect of the number of tanks approached 1, meaning that the effect of installing a weir was hardly noticeable. In this way, with conventional stirring devices that simply incorporate a fixed weir in addition to conventional stirring means, powder and granule material
There was a problem that it was very difficult to improve RTD. For example, in stirring equipment for olefin polymerization or polyolefin drying,
The presence of pass particles and the like causes nonuniform quality, deterioration of physical properties, poor appearance, etc. in the obtained polyolefin, and therefore, an early solution to the problems of the above-mentioned prior art has been desired. [Means for Solving the Problems] The present invention solves the problems of the prior art as described above, and makes it possible to perform continuous stirring with uniform residence time of powder and granules on an industrial scale for a long period of time. This was achieved as a result of intensive research with the aim of providing a horizontal, single-shaft stirring device that can be used as a stirrer. 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 stirring device being fixed to the inner wall of the container in a direction perpendicular to the rotation axis. (i) A stirring device characterized in that the interior of the container is divided into two stirring zones by one fixed weir, and two paddle sets adjacent to each other across the fixed weir satisfy the following conditions; (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 [here β: fixed Phase angle difference between adjacent paddle sets across the weir on the projection plane perpendicular to the axis of rotation of each paddle, D: Inner diameter of horizontal cylindrical container (mm), l ₁ : Inner wall of container and supply port Clearance between the paddle tip of the paddle group on the side (mm), l ₂ : Clearance between the inner wall of the container and the tip of the paddle of the paddle group on the outlet side (mm), S ₁ : Paddle of the paddle group on the supply port side and the fixed weir (mm), S ₂ : Clearance (mm) between the paddle of the paddle assembly on the outlet side and the fixed weir (mm). [Description of Configuration] 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. An explanatory diagram viewed in the direction of the arrow from line A-A indicating the position of the paddle, Figure 3 shows the phase angle difference of the paddle.
An explanatory diagram showing the adjacent paddle set at 90 degrees at the same position as in Figure 2, Figure 4 is an explanatory diagram showing the adjacent paddle set rotated 90 degrees from the state in Figure 3, and Figure 5 is An explanatory diagram showing the height of the powder/granular material accumulation surface that changes as the paddle set rotates when stirring the powder/granular material;
Figures 6 and 7 show the position of the paddle set for the two extreme cases corresponding to Figures 3 and 4, respectively, showing changes in height of the powder and granule accumulation surface near the fixed weir when stirring the powder and granules. The side explanatory views, FIGS. 8, 9, and 10 shown together with the figures show various aspects of the arrangement of the fixed weir and the adjacent paddle set on both sides of the fixed weir in the device of the present invention, and the formation of the powder deposition surface. FIG. In the drawings, 1 is a horizontal cylindrical container (diameter D, length L, 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 FIGS. 1 and 2, a paddle set 5 consisting of one or more rectangular flat paddles (width W) each extending over almost the entire length of the rotating shaft 4 (two paddles in the example shown) is attached. A plurality of sets are provided, and the rotating shaft 4 constitutes a stirring means. This stirring means and the container 1 containing it constitute a horizontal uniaxial stirring device. Although the number of paddles in each paddle set 5 is two in the illustrated example, this is not necessarily necessary; for example, paddle sets 5 consisting of different numbers of paddles, such as one, two, or three, may be mixed. Also good. However, as will be described later, it is necessary that the number of paddles be equal between adjacent paddle sets across the fixed weir. Reference numeral 7 denotes a fixed weir, as shown in FIGS. 1 and 2, which is located above and between the inner wall of the container at a position that divides the length L of the container 1 into approximately the same length in the direction perpendicular to the rotating shaft 4. is fixed to the inner wall of the container leaving a half-moon-shaped opening 8 (consisting of an arc and a chord, not necessarily a semicircle), and this fixed weir 7 creates two stirring zones (hereinafter referred to as , the supply port 2 side is sometimes referred to as a first zone, and the extraction port 3 side is sometimes referred to as a second zone). By the way, in the device of the present invention, this fixed weir 7
Two adjacent paddle sets (hereinafter, each may be referred to as adjacent paddle sets), that is, the adjacent paddle set 5a located on the supply port 2 side (upstream side) and the adjacent paddle set 5a located on the extraction port 3 side (downstream side). A feature of the present invention is that the adjacent paddle set 5b located therein satisfies the conditions (i) to (v) shown above. The horizontal cylindrical container 1 used in the device of the present invention has a ratio L/D of length L to diameter D.
is preferably 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 1/4πD ² . 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. [Function] Hereinafter, the function of the device of the present invention will be explained together with the history of development of the device of the present invention. Even if it is a horizontal uniaxial stirring device provided with one fixed weir 7, if the above conditions for adjacent paddle sets 5a, 5b are not satisfied, for example, the number of paddles of both adjacent paddle sets 5a, 5b is are different, or even if they are the same, both adjacent paddle sets 5
Phase angle difference β between at least some of the paddles a and 5b
is not 0° (in the former case, the paddle phase angle difference is naturally the same as in the latter case), then
The flow pattern in the axial direction in which the powder and granules pass through the opening 8 above the fixed weir 7 is not unidirectional, but the powder and granules scraped up by the paddle set 5b on the downstream side pass over the fixed weir 7. Some move backwards. At the opening 8 above the fixed weir 7, if the granular material only moves from the first zone to the second zone, the effect of the number of tanks will appear to some extent, but if the above conditions are not satisfied, the second zone There is also a reverse movement from the first zone to the first zone, and the amount of granular material movement from the first zone to the second zone increases by this reverse movement, resulting in an increase in the short pass, making the residence time non-uniform.
Further, the amount of reverse movement per unit time increases as the number of rotations increases, and in extreme cases, even if the fixed weir 7 is installed internally, its 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. 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 opening angle α° between the paddles 6a and 6a of the adjacent paddle set 5a and the paddles 6b and 6b of the adjacent paddle set 5b in each of the adjacent paddle sets 5a and 5b is both
It is set at 180°. There is a phase angle difference β between both adjacent paddle sets 5a and 5b for two sets each consisting of one paddle 6a and one paddle 6b, but in the above example, the phase angle difference β
As an example where is not 0°, both sets are set at 90°. When these paddle sets 5a and 5b are rotated 90 degrees from the position shown in FIG. 3, they will be in the position shown in FIG. 4. in general,
When the stirring device holds an appropriate amount of powder (often about 60% by volume of the device) and the paddle set 5 is rotated, the slope of the surface on which the powder is deposited changes.
The height of its top area varies up and down. Although the state of change differs depending on the properties of the powder, the number of revolutions, the amount held, etc., the paddle set 5 reaches the angle of repose approximately near the rotational position shown in FIG. The area will be at the highest level (denoted by HL). Furthermore, when the paddle set 5 is rotated by 1/2 of the opening angle α (90° in the example shown) from the rotation position shown in FIG. 5 (the rotation position of the paddle set 5 is not shown), the surface of the powder deposited The area around the top is the lowest level (represented by LL)
become. In addition, when the paddle set 5 is in the middle of the above two rotational positions, the entire top area of the powder accumulation surface is HL and LL.
and the average level (expressed as AL). Therefore, the level over the top of the granular material accumulation changes as HL→AL→LL→AL→HL during the rotation of the paddle set 5. Here, as shown in Figs. 3 and 4, when the phase angle difference β between adjacent paddle sets is 90°, and the phase angle difference between other mutually adjacent paddle sets is also 90°, based on the above results, When examined, as shown in FIGS. 6 and 7, when the entire top area of the powder accumulation surface of either 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 entire top area of the powder/grain material deposition surface in the area of the adjacent paddle set 5a or 5b is always LL. Therefore, when stirring the powder by continuously rotating the rotating shaft 4, the adjacent paddle sets 5a and 5b are placed in the position shown in FIG. 3 (the adjacent paddle set 5a is in the position shown in FIG.
), as shown in Figure 6,
The entire top area of the powder/granular material accumulation surface in the adjacent paddle group 5a area is at level HL, and the entire top area of the powder/granular material accumulation surface in the adjacent paddle group 5b area is at level LL. 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 first zone to the second 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 entire top area is shown in Figure 7.
HL and LL are reversed, and the granular material crosses the fixed weir 7 and moves backward from the second zone to the first zone. This reversal phenomenon of levels HL and LL occurs at equal intervals in time in the above example 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 state of movement of the powder and granules may be affected. are basically the same. In this way, when the height of the level of the entire top area is alternately reversed between the powder and granule accumulation surfaces of the adjacent paddle sets 5a and 5b with the fixed weir 7 in between, a reverse movement phenomenon of the powder and granules always occurs. It was found that on the one hand, long-term residence particles were generated, and on the other hand, many short-pass particles were generated, making the residence time uneven.
As a result of further studies in order to reduce this reverse movement phenomenon, it was found that the respective levels of the top area of the powder and granular material accumulation surface scraped up by the rotating paddles 6a and 6b of the adjacent paddle sets 5a and 5b at the same time. Paddle 6 that is the same and does not cause a difference in
We have come to the realization that the arrangement of a and 6b is important. Then, the conditions for that are 5 adjacent paddle groups.
Paddles 6a and 6b of a and 5b have a rectangular shape with the same width W, and as shown in FIG. 8, clearances l ₁ and l ₂ (l ₁ and l ₂ in FIG. teeth,
Since this is a slightly oblique view of the clearance between the tips of the paddles 6a, 6b and the inner wall of the container, only their positions are shown. The same applies to FIGS. 9 and 10. ) are equal and the clearances S ₁ and S ₂ with the fixed weir 7 are also equal, and the following conditions were recognized as the basic conditions for equalizing residence time. (i) Paddle 6a between both adjacent paddle sets 5a and 5b,
The numbers of 6b are equal. (ii) Each paddle 6 between both adjacent paddle sets 5a and 5b.
The phase angle difference β between a and 6b is 0°. In other words, condition (ii) means that both adjacent paddle sets 5a,
1 set 2 consisting of one each of paddles 6a and 6b of 5b
This means that the paddles 6a, 6b coincide as shown in FIG. 2 when viewed in the direction of the rotating shaft 4, but it is not necessarily necessary that the opening angles α are equal. In this case, even if the level of the top area of the powder/grain material accumulation surface in each region of both adjacent paddle sets 5a and 5b is in any state from HL to LL, for example, in the case of HL, the
As shown in the figure, unless powder is supplied from the supply port 2, 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 the powder pressure 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, and the movement of powder and granules over the fixed weir 7 does not occur. No. In such an arrangement of the fixed weir 7 and the adjacent paddle sets 5a and 5b, when powder and granular material is supplied from the supply port 2, only the increase in the first zone results in a slight level difference, and the powder and granular material indicates a flow pattern of movement only from the first zone to the second zone. Next, the paddle 6 is moved between both adjacent paddle sets 5a and 5b.
Even if the number of sheets a and 6b are equal and the phase angle difference β is 0°, when the area of the opening 8 of the fixed weir 7 is large, when the rotation speed is high, when there is a large amount of powder and granular material, etc. In this case, the degree of scattering of powder particles in the axial direction increases, and prevention of short passes and reverse movement due to scattering is not always sufficient. As a result of various studies on preventing such scattering or reverse movement, we found that the width W of the paddles 6a and 6b of both adjacent paddle sets 5a and 5b is the same (this condition will not be changed in the following explanation). It was recognized that there is a sufficient preventive effect when l ₂ /l ₁ ≧1 and S ₂ /S ₁ ≧1.
The case of l ₂ /l ₁ =1 and S ₂ /S ₁ =1 is as seen earlier in FIG. When l ₂ /l ₁ > 1 and S ₂ /S ₁ = 1, the powder and granular material is shown in Figure 9, and when l ₂ /l ₁ = 1, S ₂ /S ₁ > 1, it is shown in Figure 10. The formation state of the entire top area of the deposition surface is shown. 9 and 10, in both cases, the trough P' formed by the contact between the powder and granular material accumulation surfaces in the areas of both adjacent paddle sets 5a and 5b is 2nd It is located on the zone side, and the existence of an axial distance Hs between the valley P' and the plane P is recognized. The existence of this distance Hs on the second zone side means that the powder pressure on the plane P is directed from the first zone to the second zone, and the larger Hs is, the harder it is for the powder to move backwards. . Next, we empirically determined in many experiments what range l ₁ should practically be set in relation to the inner diameter D of container 1, and found that the appropriate range for l ₁ is (iii) D/100 It was found that ≦l ₁ ≦D/20. Further, the larger S ₂ /S ₁ is, the more effective it is in preventing reverse movement, but on the other hand, if it is too large, the state of stirring of the powder and granular material in the clearance S ₂ will deteriorate, and if it is too large, it will become a dead space. Regarding this point as well, it was empirically determined that (v) 1≦S ₂ /S ₁ ≦20 is an appropriate range. The stirring device according to the present invention was constructed as described above. Next, we further investigated l ₂ /l ₁ and S ₂ /S ₁ through many experiments, and found that (iv) 1≦l ₂ /l ₁ ≦3 (v) 1≦S ₂ /S ₁ ≦12. When stirring powder and granular materials with a relatively narrow particle size distribution,
In addition, in the case of (iv) l ₂ /l ₁ =1 (v) 1≦S ₂ /S ₁ ≦3, in addition to the above-mentioned powder and granules, it is also particularly important to agitate powder and granules with a shape close to spherical. It was found to be suitable. [Method of Use] Applications of the device of the present invention are not particularly limited, but include a gas phase polymerization device for gas phase polymerization of α-olefin having 2 to 6 carbon atoms together with a catalyst containing a transition metal compound, and post-treatment after gas phase polymerization. It is preferably used as a gas phase reaction device, a polymer drying device, etc. When carrying out gas phase polymerization of olefins using the apparatus of the present invention in this manner, the rotation is performed so that the Froude number (Fr) shown below is in the range of 0.05 to 3.0, preferably in the range of 0.2 to 2.0. It is better to let Fr=Rω ² /g where R: length from the center of the rotation axis to the tip of the paddle, ω: angular velocity (=2πN, N is the rotation 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 amount held in the first zone and the second zone be equal, or that the amount held in the second zone be slightly smaller than that in the first zone 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] By using the stirring device according to the present invention, the amount of shots and passes of polymer particles, etc. can be extremely reduced and the residence time of powder and granules can be made uniform. of powder and granules
RTD can be approximated to batch polymerization or batch processing RTD, and therefore the quality of the stirred object,
Physical properties etc. can be improved. [Examples and Comparative Examples] The present invention will be specifically described below using Examples and Comparative Examples. Example 1, Comparative Examples 1 to 3 A paddle with a width w of 50 mm is attached to a rotating shaft with a diameter d of 110 mm in a horizontal cylindrical container with an inner diameter D of 430 mm and a length L of 1320 mm (L/D = 3). Using the present invention apparatus of the various embodiments described above and a horizontal uniaxial stirring apparatus which is outside the scope of the present invention in terms of the presence or absence of a fixed weir or the manner in which paddles are attached,
Inert polypropylene powder with a relatively narrow particle size distribution of 0.5 g/cm ³ was continuously fed at 15 kg/hr and continuously stirred at a rotation speed of 60 rpm (Fr = 0.826) to calculate the amount of powder retained during steady operation. The device capacity was kept at 60% by volume. In this case, the actual volume of the device is 179, so
The average residence time φ is 3.58 hours (215 minutes). During this steady operation, 270 g of the same colored polypropylene powder (equivalent to 0.5% by weight of the amount held) as a tracer was injected into the supply port of the powder and granules, and the tracer in the polymer was extracted at the outlet of the powder and granules. The concentration of was measured over time and its change (hereinafter sometimes referred to as impulse response) was investigated. Based on this impulse response, the uniformity of the residence time of the powder and granular material in each Example and Comparative Example was investigated. Example 1 A fixed weir is installed inside the container at a position that divides the length L of the container into two, leaving a half-moon-shaped opening with an area of 140 cm ² above, and all paddle sets have two paddles. The opening angle α is 180°, the phase angle difference of the paddles between adjacent paddle sets in each zone on both sides of the fixed weir is 90°, and the clearance l between the inner wall of the container and the tip of each paddle is all 5.0 mm. Yes, in both adjacent paddle sets that are adjacent across the fixed weir, l ₁ = l ₂ = 5.0 mm [Therefore, l ₂ /l ₁ = 1, D/100 (= 4.3) < l ₁ <
D/20 (=21.5)] S ₁ =S ₂ =8.0 mm [Hence, S ₂ /S ₁ =1] In the case of 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 all adjacent paddle sets is 90°. Comparative Example 2 A stirring device similar to Example 1 except that β = 90° between both adjacent paddle sets. Comparative Example 3 The number of paddles in the adjacent paddle set on the downstream side is 3 and each opening angle α is 120°, and β = 0° for one paddle with the adjacent paddle set on the upstream side, but the other Regarding the paddles, there is no paddle for which β = 0° (therefore, there is only one set of paddles that match when viewed in the direction of the rotation axis, and in the downstream stirring zone, the adjacent paddle set and the adjacent paddle set on the downstream side) (The phase angle difference of the paddles is not necessarily 90° between the two.)
Other than that, the same stirring device as in Example 1 was used. Impulse response is sampling time function t/φ
It is shown as the change in the tracer concentration function e/e ₀ with respect to 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, and e is the tracer at time t at the powder outlet. Concentration (% by weight), e ₀ is the tracer concentration relative to the amount of tracer input relative to the amount of polymer held in the container.

[Table] Generally, when t/φ is about 0.2 or less, the larger e/e ₀ is, the more short passes there are, and the more the peak value of e/e ₀ is in the relatively large region of t/φ, the more
The number of short passes tends to decrease relatively. From Table 1, it can be seen that not only Comparative Example 1 which does not have a fixed weir, but also Comparative Example 2 which simply has a fixed weir installed, the paddle phase angle difference β between adjacent paddle sets is In Example 1 where all are 0°, short
It can be seen that the number of passes is overwhelmingly small, and the residence time of the powder and granules is uniform. Furthermore, from Comparative Example 3, it is clear that there is no effect if only a portion of the paddles between both adjacent paddle sets have β=0°. Examples 2 to 4 Example 2 The device of the present invention is the same as in Example 1 except that l ₂ =15.0 mm (therefore, l ₂ /l ₁ =3) in the downstream adjacent paddle set. Example 3 The device of the present invention is the same as Example 1 except that S ₂ =24.0 mm (therefore, S ₂ /S ₁ =3) in the adjacent paddle set on the downstream side. Example 4 l ₂ = 15.0 mm, S ₂ in the adjacent paddle group on the downstream side
= 24.0 mm (therefore, l ₂ /l ₁ >1 and S ₂ /S ₁ >1), except that the device of the present invention is the same as in Example 1. The impulse response is shown in Table 2.

[Table] From the column of Table 2 and Example 1 of Table 1, if l ₂ /l ₁ (Example) or S ₂ > S ₁ (Example 3), it is possible to equalize the residence time of powder and granular material. It is more effective and l ₂
> l ₁ and S ₂ > S ₁ (Example 4), it can be seen that there is a further synergistic effect. Examples 5 to 7, Comparative Example 4 Example 5 Same as Example 1 except that 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 is With two pieces, the opening angle α is
180°) for the device of the present invention. Example 6 The number of paddles in paddle groups other than both adjacent paddle groups is also 3
The present invention is the same as in Example 5, except that the opening angle α is 120° and the phase angle difference between the paddles is 60° between adjacent paddle sets (excluding both adjacent paddle sets). For equipment. Example 7 Same as Example 4 except that each adjacent paddle group has 3 paddles and each opening angle α1 is 120° (therefore, all paddle groups other than the above have 2 paddles and the opening angle α is 180°, l ₂ = 15.0 mm, S ₂ = 24.0 mm). Comparative Example 4 The number of paddles and the phase angle difference β in both adjacent paddle sets are the same as in Comparative Example 3 (therefore, β = 0 for one paddle in each adjacent paddle set, but β = 0 for the other paddles). ), otherwise the stirring device was the same as in Example 7. The impulse response is shown in Table 3.

[Table] From Table 3, it can be seen that when the number of paddles in each paddle set is 3, including the adjacent paddle sets on both sides (Example 6), the effect of equalizing the residence time of the powder and granular material is the same as when there are 2 paddles. Also, even if the number of paddles and the opening angle α of both adjacent paddle sets are different from those of other paddle sets, as long as the former satisfies the conditions of the present invention (Example 5), the above effects of the present invention can be achieved. It turns out that there is something. Furthermore, from the comparison between Example 7 and Comparative Example 4, l ₁ and
Even if the relationship with l ₂ and the relationship between S ₁ and S ₂ are as preferred as in Example 4, if the paddle phase angle difference β between both adjacent paddle sets does not satisfy the conditions of the present invention, the effect It turns out that there is no. Example 8 The same stirring device as in Example 1 was used as a gas phase polymerization vessel, and while a mixed monomer of ethylene and propylene was introduced together with a catalyst, a polymerization pressure of 20 kg/
cm ³ , polymerization temperature 60℃, rotation speed 40rpm (Fr=
0.367) was carried out for a long period of time with continuous stirring 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, particularly 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 the drawing]

Fig. 1 is a side view schematically and transparently showing an example of the device of the present invention, and Fig. 2 shows each paddle of two adjacent paddle sets (adjacent paddle sets) across the fixed weir in Fig. 1. 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 an explanatory diagram of the position of The figure shows the adjacent paddle groups from the state shown in Figure 3.
An explanatory diagram showing a state rotated by 90 degrees, Fig. 5 is an explanatory diagram showing the height of the powder/granular material accumulation surface that changes as the paddle set rotates when stirring the powder/granular material, Figs. 6 and 7 The figures are side explanatory views showing the height changes of the powder and granular material accumulation surface near the fixed weir when stirring the powder and granular materials, together with the position of the paddle set, for two extreme cases corresponding to FIGS. 3 and 4, respectively; FIGS. 8, 9, and 10 are side explanatory views showing various arrangements of the fixed weir of the device of the present invention and adjacent paddle sets on both sides thereof, and the formation state of the powder and granular material deposition surface. It is. 1... Horizontal cylindrical container (container), 2... Supply port,
3... Extraction port, 4... Rotating shaft, 5... Paddle group, 5a... Paddle group on the supply port (upstream) side of adjacent paddle groups (adjacent paddle groups) across the fixed weir, 5b... Extraction port in adjacent paddle set (downstream)
side paddle group, 6...paddle, 6a... paddle of the supply port (upstream) side paddle group in the adjacent paddle group,
6b... Paddle of the paddle group on the extraction port (downstream) side in the adjacent paddle group, 7... Fixed weir, 8... Opening, D... Diameter of container, d... Diameter of rotating shaft,
Hs...Distance in the axial direction between the valley part of the powder accumulation surface and the upwardly extending surface of the fixed weir, L...Length of the container, l...
…Clearance between the inner wall of the container and the tip of the paddle, l ₁ …
...Clearance between the inner wall of the container and the paddle tip of the adjacent paddle group on the supply port (upstream) side, l ₂ ...Clearance between the inner wall of the container and the paddle tip of the adjacent paddle group on the extraction port (downstream) side, AL...Powder grain average level over the top area of the particle accumulation surface, HL...highest level across the top area of the particle accumulation surface, LL...lowest level across the top area of the particle accumulation surface, P...of the fixed weir. Upper extension surface, P′...trough, S ₁ ... Clearance between the fixed weir and the paddle of the adjacent paddle group on the supply port (upstream) side, S ₂ ... Fixed weir and the adjacent paddle on the outlet (downstream) side Clearance with the pair of paddles, W...
...paddle width, α...opening angle, β...paddle phase angle difference between adjacent paddle sets.

Claims (1)

[Claims] 1. In a horizontal cylindrical container that generally has a supply port for the material to be stirred and a powder outlet at the other end, one sheet is placed at each of a plurality of positions on the horizontal rotation shaft. It is a horizontal uniaxial stirring device that has a built-in stirring means consisting of a plurality of paddle sets each having the rectangular flat paddles attached thereto, and is fixed to the inner wall of the container in a direction perpendicular to the rotation axis. A stirring device characterized in that the inside of the container is divided into two stirring zones by one fixed weir, and two sets of paddles adjacent to each other across the fixed weir satisfy the following conditions; ) 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 [here β: fixed Phase angle difference between adjacent paddle sets across the weir on a projection plane perpendicular to the axis of rotation, D: Inner diameter of horizontal cylindrical container (mm), l ₁ : Inner wall of container and supply port Clearance between the paddle tip of the paddle group on the side (mm), l ₂ : Clearance between the inner wall of the container and the tip of the paddle of the paddle group on the outlet side (mm), S ₁ : Paddle of the paddle group on the supply port side and the fixed weir clearance (mm), S ₂ : Clearance (mm) between the paddle of the paddle assembly on the outlet side and the fixed weir. ] 2 A patent in which l ₁ and l ₂ are in the relationship (iv) 1≦l ₂ /l ₁ ≦3, and S ₁ and S ₂ are in the relationship (v) 1≦S ₂ /S ₁ ≦12 A stirring device according to claim 1. 3 Claims in which 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 The stirring device according to item 1. 4 Claims in which 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 The stirring device according to item 1. 5 The supply port of the horizontal cylindrical container is for supplying a mixture of a polymerizable monomer and a polymerization catalyst that is continuously polymerized in the gas phase inside the container and becomes a powder by the time it reaches the fixed weir. The stirring device according to any one of claims 1 to 4, which is a supply port.