JPH10174855A - Agitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the treating time and to improve quality by providing a double spiral impeller formed by a first continuously wound spiral member and a second discontinuously wound spiral member with a longer pitch. SOLUTION: The impeller is composed of a frame member 7 mounted between the rotating trunnions 6 set on both ends of an agitated tank in the longitudinal direction, a spiral member 8 spirally and continuously wound on the frame member 7 and plural impeller members 9 spirally and discontinuously wound on the periphery of the spiral member 8 while keeping a minute clearance from the wall face of a vessel with a longer pitch than the spiral member 8. Besides, the spiral member 8 and impeller member 9 are wound in the center of the vessel reversely to each other. In this case, the spiral member 8 and impeller member 9 are wound so that the winding pitch is controlled respectively to 10-20% and 200-400% of the outer diameter of the impeller (the winding outer diameter of the impeller member 9).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch system used in a reaction system in which a reverse reaction is suppressed and a normal reaction is promoted by causing a chemical reaction by a stirring and mixing operation and discharging a reaction by-product to the outside of the system. The present invention relates to a stirrer.

[0002]

2. Description of the Related Art Conventionally, as a batch type stirring device for stirring and mixing, a stirring device having a stirring blade such as a helical ribbon blade in a vertical cylindrical container has been used. Japanese Patent Application Laid-Open No. 2-262524 is an example of this kind of related technology.

[0003]

In the conventional stirring apparatus, when the processing amount per batch increases, there are the following problems in scaling up.

(1) By-products generated by the reaction are gasified through the gas-liquid interface in the container and discharged out of the system. As the scale-up ratio increases, the gas-liquid boundary area with respect to the amount of the processing liquid penetrated decreases. Emission of by-products deteriorates.
As a result, the reverse reaction is promoted, and the time required for the normal reaction becomes longer.

(2) When by-products are discharged out of the system,
In order to maintain the temperature of the reaction system, the amount of latent heat of evaporation must be externally supplied to the reaction system. In the conventional stirring device, the heating surface is only the jacket surface, and as the scale-up ratio increases, the heating area with respect to the treatment liquid penetration amount decreases. As a result, the time required for heating is increased, and the operation time per batch is also increased.

(3) As the size of the stirring device increases, the stirring power also increases. If the stirring heat is larger than the amount of heat removed to the outside, the temperature of the processing liquid will increase. The rise in temperature affects the quality of the processing solution.

(4) In the container of the conventional stirrer, the processing liquid discharge nozzle is provided only at one location below the container. Also,
Since the size of the nozzle that can be attached is limited, it takes time to withdraw the processing liquid. As a result, there is a possibility that a difference in the product quality between the beginning and the end of the extraction due to the difference in the heat history may occur.

The problems (1) to (4) become more noticeable as the size of the stirrer increases.

In view of the above problems (1) to (4), an object of the present invention is to provide a stirrer capable of reducing the processing time per batch to a level equal to or less than that of a conventional apparatus even when scaled up. It is in.

In view of the above-mentioned problems (1) to (4), it is an object of the present invention to reduce the processing time per batch to the same or less than that of the conventional apparatus even if the scale is increased, and An object of the present invention is to provide a stirrer capable of obtaining a product of equal or higher quality.

An object of the present invention is to solve the above-mentioned problems (1) to (4) in scaling up, and to make the processing time per batch equal to or less than that of the conventional apparatus. An object of the present invention is to provide a stirrer capable of obtaining a product having a quality equal to or higher than the conventional one.

[0012]

The stirrer according to the present invention has the following structure to achieve the above object.

(1) An oblong or cylindrical container placed horizontally, a member continuously and spirally wound in the longitudinal direction inside the container with an outer diameter smaller than the inner diameter of the container, and While maintaining a small gap between the container wall and the outer periphery of the member, a stirring blade having a double spiral structure composed of a plurality of members wound discontinuously in a spiral shape with a wider winding pitch than the spiral member and And a rotating ear shaft that rotatably supports the stirring blades at both ends of the container.

(2) In addition to the jacket that covers the container, a hollow member is used as a member that is continuously wound spirally at a narrow winding pitch that constitutes the stirring blade, so that a heat medium from the outside of the container is provided in the hollow portion. The heat medium heated by the supply device can be flowed into the inside, so that the heat transfer area per stuck amount increases, and the heating time of the processing liquid is shortened.

(3) By flowing a heat medium for cooling through the stirring blade member, the heat removal area per stuck amount is increased, and the amount of overheating due to stirring can be appropriately removed.

(4) By providing a plurality of extraction nozzles in the longitudinal direction of the lower part of the container, the processing liquid extraction time is shortened.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a chemical reaction is performed by a stirring and mixing operation, and a reaction by-product is discharged to the outside of the system to suppress a reverse reaction and apply the present stirring device to a reaction system in which a forward reaction is promoted. is there.

FIGS. 1 and 2 are a front view and a side view showing the structure of this embodiment. The stirrer according to the present embodiment is roughly divided into a stirrer, a stirrer, and a driving device.

The stirring tank has an oval or cylindrical tank wall 1,
It is constituted by a side wall 2. A single or plural processing liquid inlet nozzles 3 and by-product exhaust nozzles 4 are mounted on the upper part of the stirring tank, and a single or plural processing liquid discharge nozzles 5 are mounted on the lower part of the stirring tank. The mounting position, size, and number of these nozzles are determined according to the amount of processing liquid to be applied.

The stirring blade comprises a rod-shaped frame member 7 mounted between rotary ear shafts 6 provided at both ends in the longitudinal direction of the stirring tank, and a coil-shaped member 8 continuously wound spirally around the frame member. A plurality of wing members 9 wound discontinuously in a spiral shape with a winding pitch wider than that of the spiral member while maintaining a small gap between the container wall surface and the outer periphery of the member. In addition, the coil-shaped member 8 and the stirring blade member 9 are installed so as to be oppositely wound at the center of the container. At this time, the coil-shaped member 8 and the stirring blade member 9 are wound so that the winding pitch is 10 to 20% and 200 to 400%, respectively, with respect to the blade outer diameter (rolling outer diameter of the stirring blade member). In addition, the stirring blade has the rotating ear shaft 6 supported by a bearing 10. Further, in order to keep the gap between the tank wall 1 and the stirring blade member 9 caused by the manufacturing tolerance of the stirring blade and the tank wall 1, the outer peripheral dimension of the stirring blade member 9 is adjusted and attached.

A driving device 11 for driving the stirring blade is provided at one end of the rotary ear shaft 6.

Further, the rotary ear shaft 6 on the non-drive side has a double-tube rotary joint for circulating the heat medium heated or cooled by the heating / cooling medium supply device 13 inside the coiled member 8. 12 are installed.

Next, the operation of the above-structured stirring device will be described. The processing liquid is injected into the container by the processing liquid injection nozzle 3, and the liquid surface position is applied to the vicinity of the rotary ear shaft 6 (an application rate of 50 to 65% with respect to the total volume). During the stirring, the treatment liquid 20 (FIG. 3) attached to the coil member 8 and the stirring blade member 9 is lifted up to the stirring shaft 6 or more with the rotation of the stirring blade, and then drips down by free fall, thereby causing the coil member to drop. A thin liquid film evaporation surface 21 (FIG. 3) as shown in FIG. During the stirring, by-products generated by the reaction are gasified from the evaporation surface 21 and are efficiently evaporated. After that, the by-product is the by-product exhaust nozzle 4
Through the stirrer. Further, during the stirring, the processing liquid is gathered at the center of the container by the feeding action of the coil-shaped member 8 and the stirring blade member 9, so that the processing liquid flow 22 as shown in FIG. The processing liquid is uniformly mixed. During the reaction, the amount of heat required for evaporation of the by-products is such that the heating fluid having a higher temperature than the processing liquid is supplied to the heating / cooling medium supply device 13 → double-tube rotary joint 1 in addition to the stirring heat.
2 → Rotary shaft 6 → Coiled member 8 → Frame member 7 → Rotary shaft 6 → Double tube type rotary joint 12 → Heating / cooling medium supply device 1
The heat is absorbed from outside by circulating in the path of No. 3. Unnecessary stirring heat generated during stirring of the high-viscosity processing liquid is exhausted by circulating a cooling fluid having a lower temperature than the processing liquid in the same path. The processing liquid after the reaction is discharged in a short time from the processing liquid discharge nozzles 5 attached to the lower part of the container.

Table 1 below shows the results of a comparison of the effects of the present invention on a conventional batch stirrer having the same filling amount, performed by the present inventors.

[0025]

[Table 1]

As described above, since the agitator of the present invention has a larger gas-liquid boundary area and a larger heat transfer area than the conventional batch type agitator having the same filling amount, the processing time per batch is shorter than that of the conventional apparatus. It can be equal to or less than the equivalent, and as a result, a product of equal or superior quality to the conventional type can be obtained.

[0027]

According to the present invention, a chemical reaction is carried out by a stirring and mixing operation, a reaction by-product is gasified and discharged to the outside of the system, thereby suppressing a reverse reaction and promoting a normal reaction. As compared with the conventional batch stirrer having the same filling amount, the processing time per batch can be made equal to or less than that of the conventional batch stirrer, and as a result, a product having the same or higher quality as the conventional type can be obtained. .

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a stirring device according to the present invention.

FIG. 2 is a side view showing an embodiment of the stirring device according to the present invention.

FIG. 3 is a diagram showing an evaporation surface formed during stirring in the stirring device of FIGS. 1 and 2;

FIG. 4 is a view showing a flow direction of a processing liquid formed during stirring in the stirring device of FIGS. 1 and 2.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tank wall, 2 ... Side wall, 3 ... Processing liquid input nozzle, 4 ... By-product exhaust nozzle, 5 ... Processing liquid discharge nozzle, 6 ... Rotating ear shaft, 7 ... Frame member, 8 ... Coil member, 9 ... Stirring blade members,
Reference numeral 10 denotes a bearing, 11 denotes a driving device, 12 denotes a double-pipe rotary joint, and 13 denotes a heating / cooling medium supply device.

Claims (6)

[Claims] 1. An oval or cylindrical container installed horizontally, and a first spiral member continuously spirally wound with an outer diameter smaller than the inner diameter of the container in a longitudinal direction in the container. While maintaining a minute gap with the container wall surface on the outer periphery of the member, a plurality of second spirally discontinuously wound second windings having a larger winding pitch than the first spiral member are provided.
A stirring device comprising: a stirring blade having a double spiral structure constituted by the above spiral member; and a rotating ear shaft rotatably supporting the stirring blade at both ends of the container. 2. A stirrer according to claim 1, wherein the winding directions of the members constituting the double spiral are oppositely wound at one end and the other end from the center in the longitudinal direction of the container. A stirring device characterized by the above-mentioned. 3. The stirring blade according to claim 1, wherein the member continuously wound spirally at a narrow winding pitch is a hollow member, and a heating medium for heating or cooling is flowed inside the hollow member. Item 3. The stirring device according to Item 1 or 2. 4. The stirrer according to claim 1, wherein a plurality of extraction nozzles are provided below the oval or cylindrical container. 5. An operating method, characterized in that, when stirring the processing liquid by the stirring device according to any one of claims 1 to 4, the processing liquid is filled in a range of 50 to 65% of the total volume of the container. 6. When the processing solution is stirred by the stirring device according to any one of claims 1 to 4, the operation is performed by varying the rotation speed of the stirring blade in the range of 1 to 40 rpm according to the viscosity of the processing solution. A driving method characterized in that: