JPH03229629A - Stirring reaction apparatus - Google Patents

Abstract

PURPOSE:To economically perform operation of high productivity and to secure stable quality by providing the baffle assisting the stirring effect of the content in a stirring tank and providing the controller controlling the posture of the baffle to the outside of the stirring tank. CONSTITUTION:A liquid raw material is introduced into a hermetically closed stirring tank 1 and a necessary auxiliary agent or catalyst is added thereto to heat or cool the content in the stirring tank 1. The baffle 12 assisting the stirring effect due to the stirrer 3 of the content in the stirring tank 1 is provided in the stirring tank 1 and the controller (e.g. a worm speed reducer 29 or support rod 16) of the posture of the baffle 12 is arranged to the outside of the stirring tank 1. As a result, economical operation of high productivity becomes always possible and stable quality can be secured.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention involves stirring liquid raw materials in a sealed stirring tank and performing a reaction operation, thereby ensuring stable quality, high productivity, and economical. This invention relates to a stirring reactor that can be operated in a variety of ways.

<Prior art> Traditionally, when producing synthetic resins, liquid raw materials are received in a sealed stirring tank, necessary auxiliary agents, catalysts, etc. are added thereto, and the contents are passed through a stirring machine. While stirring, a coil or jacket is installed inside the stirring tank, and a heating medium is passed through this to heat or cool the contents, thereby operating the polymerization reaction. .

In order to enhance the effect of stirring in the stirring tank, the stirring tank is equipped with a baffle bar or a baffle plate with a protrusion attached to one part of the outer circumference of a support rod arranged parallel to the stirring tank. It is equipped with at least one protrusion (baffle plate) (hereinafter collectively referred to as a panful) supported on the inner wall of the pan.

The effect that baffles have on the stirring state is determined not only by the number of baffles installed, but also by the direction in which the baffle protrusions are facing (baffle angle).
This is related to the attitude of the baffle. And in general,
When the protrusions face the center of the stirring tank, the baffle's effectiveness in inhibiting the flow of contents due to stirring is maximized.

The strength of stirring the contents (Wt stirring strength) is determined when the above-mentioned baffle effect is maximum, provided that the specifications of the stirrer (1j1 stirring blade type, size, rotation speed, etc.) are the same. becomes maximum.

In addition, at this time, the degree of heat conduction between the contents and the medium for heating or cooling increases, but naturally the power required for stirring is also large.

When conducting a polymerization reaction, heat transfer is an important factor, and the degree of heat transfer has never exceeded a high degree, but when the stirring intensity is greater than necessary, power is wasted. Conversely, if the stirring intensity is insufficient, the contents will not be mixed evenly, and in some cases, the formed polymer may settle, and the reaction will not occur normally due to insufficient heat transfer, resulting in so-called , it can also lead to abnormal reactions. Moreover, the stirring intensity is a factor that has a subtle influence on the properties of the produced polymer. In other words, if the stirring intensity is not appropriate,
In the reaction operation, a polymer having desired physical properties (for example, the size of the particles of the produced polymer, the degree of polymerization, etc.) will not be produced.

For this reason, conventionally, the optimum posture (direction in the stirring tank) was determined through trial production, etc.
After that, it was firmly fixed so that it would not easily move due to the flow of contents during operation.

<Problem to be solved by the invention> However, in the reaction operation using the conventional stirring tank described above, it is rare these days that the types and specifications of synthetic resins manufactured in one stirring tank are the same. Therefore, it is normal to manufacture resins of various types and specifications. and,
Naturally, the operating conditions for the reaction operation vary depending on the product type and specifications, and the stirring intensity is changed accordingly.

In this case, the rotational speed of the stirrer is often changed, but if the rotational speed is below a certain level, the produced polymer may settle as described above, so there is a limit to how much the rotational speed can be changed. Therefore, it is necessary to change the full attitude (orientation), but this work must be done while supporting the baffle inside the stirring tank, so a worker must enter the tank each time. There was a problem.

In addition, there is the problem that production time is lost because it takes a considerable amount of time to change the position of the baffle, including the need to replace the inside of the stirring tank with air. Ta.

Furthermore, depending on the product type and specifications being manufactured, the initial operation of the reaction operation may have a large effect on the formation of the polymer, and in this case, it is necessary to apply a relatively large stirring intensity at times. . Further, after a certain period, the stirring intensity is not so important, and in fact, it may be better to reduce the stirring intensity without lowering the stirring speed in order to suppress the foaming phenomenon.

In such a case, operating the baffle in a paused position all the time has the problem of wasting power.

Furthermore, when the polymerization reaction operation is completed, a cleaning nozzle is usually inserted into the tank and the generated polymer adhering to the inner wall and baffle of the stirring tank is cleaned by spraying high-pressure water, etc. However, the high-pressure water can only clean the areas that can be reached, and the inner surface of the tank that is in the shadow of the baffle and the back side of the baffle that does not face the cleaning nozzle become blind spots and cannot be cleaned.

Therefore, there is a problem in that the attached polymer remains as it is, which adversely affects the next reaction operation.

The present invention overcomes these conventional problems and aims to provide a stirring reaction apparatus that is always economical, has high productivity, and can ensure stable quality.

Means for Solving the Problems> The present invention provides a stirring reaction apparatus in which a raw material is charged using a stirring device, a necessary auxiliary agent or catalyst is added thereto, and the contents are heated or cooled. The stirring tank is characterized by comprising a baffle provided within the stirring device for assisting the stirring effect of the contents therein, and a control device for controlling the posture of the baffle provided outside the stirring tank.

Effect> In the present invention, the posture of the baffle provided in the stirring tank is
Changes can be made easily and quickly using a control device installed outside the stirring tank.

Therefore, it is possible to easily select the position of the baffle that provides the optimum stirring strength according to the type and specification of the product to be manufactured. Therefore, in addition to economical operation, there is no time lost due to changing the angle of the baffle, and productivity is improved.

Furthermore, even when the stirring intensity is changed as the reaction time progresses depending on the product type and specification, this can be easily handled by changing the orientation of the baffle, and economical operation can also be achieved.

Furthermore, when cleaning the inside of the tank after one reaction operation is completed and the product produced is taken out, the entire surface of the baffle can be cleaned by easily changing the position of the baffle.

For this reason, the removal of attached polymers is insufficient, and
Stable quality can be ensured without adversely affecting subsequent reaction operations.

<Example> A practical example of the present invention will be described below based on FIGS. 1 to 3.

The stirring reaction apparatus according to this embodiment is broadly divided into a stirring tank 1 and a stirring section 2 having a circular cross section.

The stirring section 2 includes three stirring blades 3 placed at the center of the lower part of the stirring tank I;
A stirring shaft 4 passing through the upper part, a shaft sealing part 5 provided at the penetrating part of the stirring shaft 4 in the stirring tank 1, a support part 6 above the coaxial sealing part 5,
It is composed of a speed reducer 7 that transmits power to the stirring shaft 4 provided above the support section 6, a stirring motor 8 connected to the speed reducer 7, and the like.

As shown in FIG. 1, the stirring tank 1 is equipped with a nozzle group 9 for receiving raw materials and auxiliary agents, a discharge nozzle 10 for discharging the produced product, a manhole 11, and a baffle 12. There is. In addition, the stirring tank 1 is provided with a jacket 13 around its outer periphery, and from a nozzle 14 provided at the bottom of the jacket 13,
Heat is transferred to and from the contents in the stirring tank 1 while the heat medium is received and discharged from a nozzle 15 provided at the top.

The baffle 12 includes a support rod 16 that approaches the side wall of the stirring tank 1 and extends in the vertical direction, and a protrusion that extends in the vertical direction in one direction on the outer periphery of the support rod 16 in parallel with the support rod 16. 12a is attached, and one end of the support rod 16 is
It passes through a nozzle 19 provided on the upper end plate 17 of the stirring tank 1 and extends to the outside of the tank.

As shown in FIGS. 2 and 3, a support portion 20 is fixed to the upper end of the nozzle 19, surrounding the support rod 16, and the portion of the support rod 16 extending outside the stirring tank l is fixed to the upper end of the nozzle 19. A shaft seal 21 provided between the sleeve 16a of the support rod 16 and the lower part of the support portion 20 maintains airtightness. In the coaxial sealing part 21, a circumferential ring 22 and a fixed ring 23, each having a smooth metal surface and supported by the sleeve 16a of the rotating support rod 16 and the fixed support part 20, face each other. A spring 24 disposed between the lower surface of the fixed ring 23 and the support portion 20 brings the circumferential ring 22 and the fixed ring 23 into close contact with each other, thereby mechanically sealing the shaft.

The spring 24 is designed so that it does not come into contact with the fluid in the stirring tank 1, and is also designed to prevent the fluid in the stirring tank 1 from coming into contact with the nozzle to prevent the fluid in the stirring tank from rising and easily forming a polymer. 19 and the support rod 16,
Furthermore, an injection hole 25 passing through the lower part of the support part 20 is provided,
A fluid that does not affect the reaction operation (for example,
(N2 gas) is continuously injected.

Further, in the support portion 20, a sleeve 1 of the support rod ]6 is provided.
There are two bearings 26 that support the baffle 6a, and support the baffle 12 rotatably.

Furthermore, a worm reducer 29 incorporating a worm wheel 32 attached to the upper end of the support rod 16 is fixed to the upper part of the support part 20. It meshes with a worm 31 provided at the end of the horizontal shaft of the baffle motor (baffle motor) 28.

In addition, 18 is a lower end plate of the stirring tank 1, and 30 is an angle indicating needle of the support rod attached to the lower part of the worm reducer 29 of the support rod 16.

Next, the operation of this embodiment configured as above will be explained.

After feeding raw materials and auxiliary agents into the stirring tank 1 through the nozzle group 9, and introducing the catalyst through the manhole 11, the stirring tank 1 is sealed. Around this time, the stirring motor 8 of the stirring section 2 is driven to rotate the stirring blades 3 to start stirring. At the same time, a high-temperature heat medium was flowed into Jakento 3.
The contents are heated to a predetermined temperature. When the reaction of the contents starts and the temperature of the contents increases due to the heat of reaction, the temperature of the heat medium to be supplied is adjusted by a regulator (not shown) so that the contents of the stirring tank 1 reach a predetermined temperature. adjusted to.

The rotational speed of the stirring shaft 4 is adjusted to an appropriate rotational speed by changing the rotational speed of the stirring motor 8 or by reducing the speed using the filter 7.

Furthermore, regarding the attitude (orientation within the stirring tank 1) of the protrusion 12a of the baffle 12, as the baffle motor 28 rotates forward or backward, the rotation of the baffle motor 28 is decelerated by the worm deceleration 1129. The angle is then transmitted to the support rod 16, and as the support rod 16 rotates, the protrusion 12a rotates around the support rod 16, thereby adjusting to a predetermined angle. The baffle angle can be easily confirmed by the needle 30 indicating the angle, but since the baffle motor 28 rotates by the amount of the applied signal, it can also be confirmed by the value of the signal.

Therefore, once the product type and standard to be produced are decided, the baffle 12
The protrusions 12a can be automatically adjusted to a predetermined optimal angle, and the stirring intensity in the stirring tank l can be set to the optimal value. You can also change it with .

During operation, rotational force acts on the support rod 16 due to the flow of the contents, but since the worm reducer 29 has a self-locking effect, there is no attempt to rotate the support rod 16 as an output shaft from the contents side. will not rotate. Therefore,
- If the angle, that is, the posture of the protrusion 12a of the vasoful 12 is selected, it will not go out of order from now on.

Furthermore, when the inside of the stirring tank is cleaned after the reaction operation is completed, the baffle angle is automatically changed in accordance with the operation of the cleaning device that moves the cleaning nozzle (not shown). This results in
The baffle 12 can be cleaned over its entire surface. Further, by rotating the protrusion 1.2a of the baffle 12, the portion of the inner wall that is in the shadow of the protrusion 12a of the baffle 12 can be reliably cleaned.

In this embodiment, by using a servo motor for the baffle motor 28, the amount of rotation of the motor 28 can be remotely controlled and automated in response operations and cleaning operations depending on the product type and standard to be produced. , motor 28
Alternatively, a general-purpose motor may be used, and the motor may be manually rotated forward or reverse each time to adjust the angle to a predetermined angle.

It goes without saying that the baffle motor 28 may not be directly connected to the speed reducer 29 but may be driven using a chino, a toothed heald, or the like.

Furthermore, in this embodiment, there is only one baffle 12, but a plurality of panfurs may be provided and changed at the same time or individually, and the shape of the protrusion 12a of the baffle 12 is also different from the support rod 16. -In addition to the parallel shapes of this embodiment, other shapes that can adjust the stirring intensity can be adopted.

Furthermore, in this embodiment, the support rod 16 of the baffle 12 is supported by penetrating the upper end plate 17 of the stirring tank 1, but it may also be supported by penetrating the lower end plate 18 of the stirring tank 1. good.

<Effects of the Invention> As explained above, according to the present invention, the posture of the baffle can be freely adjusted regardless of whether the reaction operation is running or not, allowing for economical operation that matches the product types and standards to be produced. In addition to being able to clean the stirring tank and baffles more reliably, stable quality can be obtained.

In addition, since the washing is performed reliably, for example, the amount of lump-like non-standard products generated is reduced, and the yield is also improved.

Furthermore, the time required to change the position of the baffle is no longer necessary, and the time required to enter the stirring tank and remove adhered polymers that cannot be removed with washing water is reduced. , productivity improves.

Furthermore, since the position of the baffle can be easily changed, it has become easier to test prototypes of new products.

Therefore, the industrial utility value of the present invention is extremely large.

[Brief explanation of drawings]

FIG. 1 is an overall view of one embodiment of the present invention, FIG. 2 is a partial sectional view of a baffle support rod and support portion of the same embodiment, and FIG. 3 is a baffle support rod and support portion of the same embodiment. FIG. 3 is a partially cutaway perspective view of the baffle motor and the baffle motor. l... Stirring tank, 3... Stirring blade. 4... Stirring shaft, 7... Reducer 8...
- Stirring motor, 12... Baffle 12a... Baffle protrusion, 16... Support rod 20... Baffle support part, 21... Pan full shaft seal part. 28... Baffle motor, 29... Worm reducer.

Claims (1)

[Claims] In a stirring reaction device in which a liquid raw material is placed in a sealed stirring tank and a necessary auxiliary agent or catalyst is added thereto, the content is heated or cooled, and stirring that assists the stirring effect of the contents in the stirring tank. A stirring reaction apparatus comprising: a baffle provided within the tank; and a control device for controlling the posture of the baffle provided outside the stirring tank.