JP3658899B2

JP3658899B2 - Stirrer

Info

Publication number: JP3658899B2
Application number: JP33659096A
Authority: JP
Inventors: 誠二本廣; 康成佐世; 宙夫鈴木
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 1996-12-17
Filing date: 1996-12-17
Publication date: 2005-06-08
Anticipated expiration: 2016-12-17
Also published as: JPH10174855A

Description

【０００１】
【発明の属する技術分野】
本発明は撹拌混合操作により化学反応を行わせ、反応副生物を系外へ排出することによって、逆反応を抑制し、正反応が促進される反応系に用いられる回分式撹拌装置に関するものである。
【０００２】
【従来の技術】
従来、撹拌混合用の回分式撹拌装置としては、立形円筒状の容器内にヘリカルリボン翼などの撹拌翼を有する撹拌装置が用いられている。この種の関連技術としては例えば、特開平２―２６２５２４号公報が挙げられる。
【０００３】
【発明が解決しようとする課題】
従来の撹拌装置において、１回分当たりの処理量が増えていくと、スケールアップする上で、以下のような課題があった。
【０００４】
（１）反応により生じる副生物は容器内の気液界面を通じてガス化し系外へ排出されるが、スケールアップ比が大きくなるにつれて、処理液張込量に対する気液界面積が小さくなり副生物の排出性が悪くなる。その結果、逆反応が促進され、正反応に要する時間が長くなってしまう。
【０００５】
（２）副生物が系外へ排出される際には、反応系の温度を保持するために外部から蒸発潜熱分の熱量を反応系に与えなければならない。従来の撹拌装置では、加熱面はジャケット面だけであり、スケールアップ比が大きくなるにつれて、処理液張込量に対する加熱面積が小さくなる。その結果、加熱に要する時間が長くなり、１回分当たりの運転時間も長くなってしまう。
【０００６】
（３）撹拌装置が大きくなるにつれて、撹拌動力も増え、その撹拌熱が外部への除熱量よりも大きいと、処理液の温度が上昇してしまう。その温度上昇により、処理液の品質に影響を与えてしまう。
【０００７】
（４）従来の撹拌装置の容器では、処理液抜出しノズルが容器下部の１箇所のみであった。また、取付け可能なノズルサイズにも制限があるため、処理液抜出しに時間がかかる。その結果、抜出し初めと終了時との製品品質に熱履歴の違いによる差が生じる可能性がある。
【０００８】
上記（１）〜（４）の課題は、撹拌装置が大型化するにつれて問題が顕著に現れてくる。
【０００９】
本発明の目的は、上記（１）〜（４）の課題に鑑み、スケールアップしても、１バッチ当たりの処理時間を従来装置と同等以下にすることができる撹拌装置を提供することにある。
【００１０】
本発明の目的は、上記（１）〜（４）の課題に鑑み、スケールアップしても、１バッチ当たりの処理時間を従来装置と同等以下にすることができ、しかも、従来と同等以上の品質の製品が得られる撹拌装置を提供することにある。
【００１１】
本発明の目的は、スケールアップする上での上記（１）〜（４）の課題を解決し、１バッチ当たりの処理時間を従来装置と同等以下にすることができ、その結果、従来と同等以上の品質の製品が得られる撹拌装置を提供することにある。
【００１２】
【課題を解決するための手段】
本発明の撹拌装置は、上記目的を達成するため以下のような装置構造を有することを特徴とする。
【００１３】
（１）水平に設置された長円もしくは円筒状容器と、この容器内の長手方向に、容器の内径よりも小さな外径でスパイラル状に連続的に巻かれた部材と更に、この部材の外周に容器壁面と微小な隙間を保ちながら、上記スパイラル状部材より巻ピッチを広くしてスパイラル状に不連続に巻かれた複数の部材とで構成される二重スパイラル構造の撹拌翼及び、この撹拌翼を上記容器の両端で回転可能に支持する回転耳軸とから構成される。
【００１４】
（２）容器を覆うジャケットに加えて、撹拌翼を構成する狭い巻ピッチでスパイラル状に連続的に巻かれた部材に中空部材を用いることにより、中空部に容器外部からの熱媒体供給装置により加熱された熱媒体を内部に流すことが可能となり、張込量当たりの伝熱面積が増え、処理液の加熱時間が短縮される。
【００１５】
（３）上記撹拌翼部材に冷却用の熱媒体を流すことにより、張込量当たりの除熱面積が増え、撹拌による過熱量分を適切に除熱することができる。
【００１６】
（４）容器下部長手方向に複数個の抜出し用ノズルを有することにより、処理液抜出し時間が短縮される。
【００１７】
【発明の実施の形態】
本発明の一実施例を図１、図２により説明する。本実施例は、撹拌混合操作により化学反応を行わせ、反応副生物を系外へ排出することによって、逆反応を抑制し、正反応が促進される反応系に本撹拌装置を適用したものである。
【００１８】
図１、２は、本実施例の構成を示す正面図及び側面図である。本実施例に係る撹拌装置は大きく分けて、撹拌槽、撹拌翼及び駆動装置により構成される。
【００１９】
撹拌槽は、長円もしくは円筒状の槽壁１、側壁２により構成される。この撹拌槽上部には、単数または複数個の処理液投入ノズル３及び副生物排気用ノズル４が、また、撹拌槽下部には単数または複数個の処理液排出ノズル５が取付けてある。なお、処理液の張込量に応じて、これらノズルの取付け位置、サイズ及び個数は決定される。
【００２０】
撹拌翼は、上記撹拌槽長手方向の両端に設置された回転耳軸６の間に取り付けられた棒状の枠部材７と枠部材にスパイラル状に連続的に巻かれたコイル状部材８及び、この部材の外周に容器壁面と微小な隙間を保ちながら、上記スパイラル状部材より巻ピッチを広くしてスパイラル状に不連続に巻かれた複数の翼部材９とから構成される。なお、コイル状部材８及び撹拌翼部材９は容器中央部で互いに逆巻きとなるように設置されている。この際、コイル状部材８及び撹拌翼部材９は、巻ピッチがそれぞれ翼外径（撹拌翼部材の巻外径）に対して10〜20％及び200〜400％となる範囲で巻き付けられる。また、撹拌翼は、回転耳軸６を軸受１０により支持されている。更に、撹拌翼及び槽壁１の製作公差により生じる槽壁１と撹拌翼部材９との隙間を一定とするため、撹拌翼部材９の外周寸法を調節して取り付ける。
【００２１】
撹拌翼を駆動するための駆動装置１１は回転耳軸６の一端に設置してある。
【００２２】
更に、反駆動側の回転耳軸６には、コイル状部材８の内部に、加熱冷却用媒体供給装置１３により加熱または冷却された熱媒体を循環させるための二重管式回転継手１２が設置されている。
【００２３】
次に、上記のように構成した撹拌装置の動作について説明する。処理液は、処理液投入ノズル３により容器内に投入され、液面位置が回転耳軸６付近まで張り込まれる（全容量に対する張込率50〜65％）。撹拌中、コイル状部材８及び撹拌翼部材９に付着した処理液２０（図３）は、撹拌翼の回転に伴い、撹拌軸６以上まで持ち上げられた後、自由落下により垂れ落ち、コイル状部材８の各ピッチごとに図３に示すような薄い液膜の蒸発表面２１（図３）を形成する。撹拌中、反応により生じた副生物はこの蒸発表面２１からガス化し、効率良く蒸発される。その後、副生物は副生物排気用ノズル４を通って撹拌装置外へ排出される。また、撹拌中、処理液にはコイル状部材８及び撹拌翼部材９の送り作用により、容器中央部に集められる作用が働くため、容器全体としては図４に示すような処理液流れ２２が生じ、処理液は均一に混合される。反応中、副生物の蒸発に必要な熱量は、撹拌熱の他に処理液よりも高い温度の加熱用流体を加熱冷却用媒体供給装置１３→二重管式回転継手１２→回転耳軸６→コイル状部材８→枠部材７→回転耳軸６→二重管式回転継手１２→加熱冷却用媒体供給装置１３の経路で循環させることによって外部より吸熱される。また、高粘度処理液撹拌中に生じる不要な撹拌熱は、処理液よりも低い温度の冷却用流体を同上経路に循環させることにより排熱される。反応が完了した処理液は、容器下部に複数個取り付けられた処理液排出ノズル５より短時間内に排出される。
【００２４】
以下に、本発明者が行った、同じ張込量の従来形回分式撹拌装置に対する本発明の効果について比較した結果を表１に示す。
【００２５】
【表１】

【００２６】
以上より、本発明の撹拌装置は同じ張込量の従来形回分式撹拌装置と比較して気液界面積及び伝熱面積が大きいため、従来装置と比べ１回分当たりの処理時間を同等以下にすることができ、その結果、従来形と同等以上の品質の製品が得ることができる。
【００２７】
【発明の効果】
本発明によれば、撹拌混合操作により化学反応を行わせ、反応副生物をガス化させ系外へ排出することによって、逆反応を抑制し、正反応が促進される反応系について、同じ張込量の従来形回分式撹拌装置と比較して、１回分当たりの処理時間を同等以下にすることができ、その結果、従来形と同等以上の品質の製品が得ることができる。
【図面の簡単な説明】
【図１】本発明による撹拌装置の一実施例を示す正面図である。
【図２】本発明による撹拌装置の一実施例を示す側面図である。
【図３】図１及び図２の撹拌装置において、撹拌中に形成される蒸発表面を示す図である。
【図４】図１及び図２の撹拌装置において、撹拌中に形成される処理液の流れ方向を示す図である。
【符号の説明】
１…槽壁、２…側壁、３…処理液投入ノズル、４…副生物排気用ノズル、５…処理液排出ノズル、６…回転耳軸、７…枠部材、８…コイル状部材、９…撹拌翼部材、１０…軸受、１１…駆動装置、１２…二重管式回転継手、１３…加熱冷却用媒体供給装置。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a batch stirrer used in a reaction system in which a chemical reaction is performed by a stirring and mixing operation and a reaction byproduct is discharged out of the system, thereby suppressing a reverse reaction and promoting a normal reaction. .
[0002]
[Prior 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 is used. As this type of related technology, for example, JP-A-2-262524 can be cited.
[0003]
[Problems to be solved by the invention]
In the conventional stirring apparatus, when the processing amount per batch increases, there are the following problems in scaling up.
[0004]
(1) The by-product produced by the reaction is gasified through the gas-liquid interface in the container and discharged out of the system, but as the scale-up ratio increases, the gas-liquid interface area with respect to the treatment liquid loading becomes smaller and the by-product Discharge is worse. As a result, the reverse reaction is promoted and the time required for the normal reaction is increased.
[0005]
(2) When the by-products are discharged out of the system, the amount of latent heat of evaporation must be given to the reaction system from the outside in order to maintain the temperature of the reaction system. In the conventional stirring apparatus, the heating surface is only the jacket surface, and as the scale-up ratio increases, the heating area with respect to the amount of treatment liquid loaded decreases. As a result, the time required for heating becomes long, and the operation time per one time becomes long.
[0006]
(3) As the agitation apparatus becomes larger, the agitation power increases, and if the agitation heat is larger than the amount of heat removed to the outside, the temperature of the treatment liquid rises. The temperature rise affects the quality of the processing liquid.
[0007]
(4) In the container of the conventional stirring apparatus, the treatment liquid extraction nozzle is only at one place at the lower part of the container. In addition, since the size of the nozzle that can be attached is limited, it takes time to extract the processing liquid. As a result, there may be a difference in product quality between the beginning and end of extraction due to a difference in thermal history.
[0008]
The problems (1) to (4) become prominent as the stirring device becomes larger.
[0009]
In view of the above problems (1) to (4), an object of the present invention is to provide an agitation device that can reduce the processing time per batch to the same level or lower as that of a conventional device even when scaled up. .
[0010]
In view of the above problems (1) to (4), the object of the present invention is to make the processing time per batch equal to or less than that of the conventional apparatus even if the scale is increased. An object of the present invention is to provide an agitation device capable of obtaining a quality product.
[0011]
The object of the present invention is to solve the above-mentioned problems (1) to (4) in scale-up, and to make the processing time per batch equal to or less than that of the conventional apparatus. It is providing the stirring apparatus from which the product of the above quality is obtained.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the stirring device of the present invention has the following device structure.
[0013]
(1) An oblong or cylindrical container installed horizontally, a member continuously wound in a spiral shape with an outer diameter smaller than the inner diameter of the container in the longitudinal direction in the container, and an outer periphery of the member A stirring blade having a double spiral structure composed of a plurality of members wound in a spiral shape with a winding pitch wider than that of the spiral member while maintaining a minute gap on the container wall The rotary ear shaft is configured to rotatably support the wing at both ends of the container.
[0014]
(2) In addition to the jacket covering the container, by using a hollow member as a member continuously wound in a spiral shape with a narrow winding pitch constituting the stirring blade, a heat medium supply device from the outside of the container is used in the hollow portion. The heated heat medium can be caused to flow inside, the heat transfer area per the amount of tension is increased, and the heating time of the treatment liquid is shortened.
[0015]
(3) By flowing a cooling heat medium through the stirring blade member, the heat removal area per the amount of tension increases, and the amount of superheat due to stirring can be removed appropriately.
[0016]
(4) By having 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 INVENTION
An embodiment of the present invention will be described with reference to FIGS. In this example, a chemical reaction is performed by a stirring and mixing operation, and a reaction byproduct is discharged out of the system, thereby suppressing a reverse reaction and applying this stirring apparatus to a reaction system in which a normal reaction is promoted. is there.
[0018]
1 and 2 are a front view and a side view showing the configuration of this embodiment. The stirring device according to the present embodiment is roughly composed of a stirring tank, a stirring blade, and a driving device.
[0019]
The stirring tank is composed of an elliptical or cylindrical tank wall 1 and a side wall 2. One or a plurality of processing liquid injection nozzles 3 and byproduct exhaust nozzles 4 are attached to the upper part of the stirring tank, and one or a plurality of processing liquid discharge nozzles 5 are attached to the lower part of the stirring tank. Note that the mounting position, size, and number of these nozzles are determined in accordance with the amount of treatment liquid applied.
[0020]
The stirring blade includes a rod-shaped frame member 7 attached between the rotating ear shafts 6 installed at both ends in the longitudinal direction of the stirring tank, a coil-shaped member 8 wound continuously in a spiral shape around the frame member, and this 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 minute gap with the container wall surface on the outer periphery of the member. In addition, the coil-shaped member 8 and the stirring blade member 9 are installed so that it may mutually reversely wind in the container center part. At this time, the coiled member 8 and the stirring blade member 9 are wound in a range where the winding pitch is 10 to 20% and 200 to 400% with respect to the blade outer diameter (winding outer diameter of the stirring blade member), respectively. Further, the agitating blade has the rotating ear shaft 6 supported by a bearing 10. Furthermore, in order to make the gap between the tank wall 1 and the stirring blade member 9 generated due to the manufacturing tolerance of the stirring blade and the tank wall 1 constant, the outer peripheral dimension of the stirring blade member 9 is adjusted and attached.
[0021]
A driving device 11 for driving the stirring blade is installed at one end of the rotating ear shaft 6.
[0022]
Furthermore, a double-pipe rotary joint 12 for circulating a heat medium heated or cooled by the heating / cooling medium supply device 13 is installed in the coil-shaped member 8 on the rotary ear shaft 6 on the non-drive side. Has been.
[0023]
Next, operation | movement of the stirring apparatus comprised as mentioned above is demonstrated. The processing liquid is charged into the container by the processing liquid charging nozzle 3, and the liquid surface position is stretched to the vicinity of the rotary ear shaft 6 (patch rate of 50 to 65% with respect to the total capacity). During the stirring, the treatment liquid 20 (FIG. 3) adhering to the coil-shaped member 8 and the stirring blade member 9 is lifted up to the stirring shaft 6 or more along with the rotation of the stirring blade, and then drips down by free fall. A thin liquid film evaporation surface 21 (FIG. 3) as shown in FIG. During the stirring, the by-product generated by the reaction is gasified from the evaporation surface 21 and efficiently evaporated. Thereafter, the by-product is discharged out of the stirring device through the by-product exhaust nozzle 4. Further, during the stirring, the processing liquid collects the central portion of the container due to 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 treatment liquid is mixed uniformly. During the reaction, the amount of heat required for evaporation of by-products is not only the heat of stirring but also the heating fluid having a temperature higher than that of the treatment liquid. Heat is absorbed from the outside by circulating through the path of the coil-shaped member 8 → the frame member 7 → the rotating ear shaft 6 → the double-pipe rotary joint 12 → the heating / cooling medium supply device 13. Further, unnecessary stirring heat generated during stirring of the high-viscosity processing liquid is exhausted by circulating a cooling fluid having a temperature lower than that of the processing liquid through the same path. The treatment liquids for which the reaction has been completed are discharged within a short time from the treatment liquid discharge nozzles 5 attached to the lower part of the container.
[0024]
Table 1 shows the results of comparison of the effects of the present invention on the conventional batch stirrer with the same amount of filling performed by the inventors.
[0025]
[Table 1]

[0026]
From the above, the stirring device of the present invention has a larger gas-liquid interface area and heat transfer area than the conventional batch-type stirring device having the same amount of tension, so the processing time per batch is less than or equal to that of the conventional device. As a result, a product having a quality equivalent to or higher than that of the conventional type can be obtained.
[0027]
【The invention's effect】
According to the present invention, the same reaction is applied to a reaction system in which a chemical reaction is performed by a stirring and mixing operation, a reaction byproduct is gasified and discharged out of the system, thereby suppressing a reverse reaction and promoting a forward reaction. Compared with an amount of a conventional batch type agitator, the processing time per batch can be made equal or less, and as a result, a product having a quality equivalent to or better than that of the conventional type can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a stirring device according to the present invention.
FIG. 2 is a side view showing an embodiment of a stirring device according to the present invention.
FIG. 3 is a view showing an evaporation surface formed during stirring in the stirring device of FIGS. 1 and 2;
4 is a view showing a flow direction of a processing liquid formed during stirring in the stirring device of FIGS. 1 and 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tank wall, 2 ... Side wall, 3 ... Processing liquid injection nozzle, 4 ... Byproduct exhaust nozzle, 5 ... Processing liquid discharge nozzle, 6 ... Rotating ear shaft, 7 ... Frame member, 8 ... Coil-shaped member, 9 ... Stirring blade member, 10 ... bearing, 11 ... driving device, 12 ... double pipe rotary joint, 13 ... heating / cooling medium supply device.

Claims

An oblong or cylindrical container installed horizontally, a first spiral member wound continuously in a spiral shape with an outer diameter smaller than the inner diameter of the container in the longitudinal direction of the container, A double structure composed of a plurality of second spiral members wound discontinuously in a spiral shape with a winding pitch wider than that of the first spiral member while maintaining a minute gap between the container wall surface and the outer periphery. A stirring device comprising: a stirring blade having a spiral structure; and a rotating ear shaft that rotatably supports the stirring blade at both ends of the container.

2. The stirring device according to claim 1, wherein the winding direction of the member constituting the double spiral is reversely wound from the central part in the longitudinal direction of the container to one end side and the other end side. apparatus.

3. The stirring blade, wherein a member wound continuously in a spiral shape with a narrow winding pitch is a hollow member, and a heating or cooling heat medium is allowed to flow inside the hollow member. Stirring device.

4. The stirring device according to claim 1, wherein the stirring device has a plurality of extraction nozzles at the bottom of an elliptical or cylindrical container.

5. A method of operation characterized in that when the processing liquid is stirred by the stirring device according to claim 1, the processing liquid is stretched in a range of 50 to 65% of the total volume of the container.

When the processing liquid is stirred by the stirring device according to any one of claims 1 to 4, the stirring blade rotation speed is varied in a range of 1 to 40 rpm according to the viscosity of the processing liquid. how to drive.