KR102395229B1 - Batch reactor with baffle - Google Patents

Abstract

Embodiments of the present invention provide a batch reactor that maintains optimal flow performance and heat removal performance in an industrial field through a double pipe type baffle structure and a multi-stage structure by a plurality of agitators. A batch reactor according to an embodiment of the present invention includes a cylindrical reactor body; stirring device; discharge nozzle; and a baffle positioned along a circumferential direction of the reactor body between the inner wall of the reactor body and the stirring device, wherein the stirring device includes at least two stirrers and one rotation shaft, wherein the baffle is at least two or more pipes Including, the pipes are separated from each other, and located in a line along the radial direction of the reactor body.

Description

BATCH REACTOR WITH BAFFLE

The present invention relates to a batch reactor, and more particularly to a batch reactor having a baffle.

A typical batch reactor includes a reactor body containing reactants, a stirrer installed inside the reactor body to stir the reactants, and a drive motor for rotating the stirrer.

In general, the batch exothermic reaction process needs to properly control the internal temperature of the reaction chamber in order to produce a uniform product, increase productivity, and improve product quality stability. Accordingly, the batch reactor may include a reactor jacket, a baffle, and a reflux condenser as components for controlling the temperature of the reactants.

The baffle consists of a tube through which the fluid flows, and is located on the outside of the agitator and close to the inner wall of the reactor body. The baffle changes the circumferential flow of the reactants according to the rotation of the stirrer in the vertical direction to improve the mixing of the reactants and to maintain a constant temperature of the reactants through heat exchange between the reactants and the fluid flowing inside the tube.

However, if the installation form of the stirrer and the baffle is changed, the internal flow characteristics may change and product quality may change accordingly, causing a big difference in the stirring performance and heat removal performance of the reactants.

Accordingly, research on a batch-type reactor capable of minimizing restrictions in an industrial field while exhibiting optimal stirring performance and heat removal performance is in progress.

The problem to be solved by the embodiments of the present invention is to solve the above problems, and by analyzing the flow characteristics and heat removal characteristics according to the improvement of the arrangement of the baffle and the structure of the stirrer, the optimum heat removal performance is secured, and in the industrial field It is to provide a reactor that minimizes the process troubles concerned.

Batch reactor according to an embodiment of the present invention for solving the above problems is a cylindrical reactor body; stirring device; discharge nozzle; and a baffle positioned along a circumferential direction of the reactor body between the inner wall of the reactor body and the stirring device, wherein the stirring device includes at least two stirrers and one rotation shaft, wherein the baffle is at least two or more pipes Including, the pipes are separated from each other, and located in a line along the radial direction of the reactor body.

The at least two stirrers may be positioned at regular intervals along the height direction of the rotation shaft.

Each of the pipes may have a cylindrical shape, and an interval between the adjacent cylindrical pipes may be 0.5 to 2 times the diameter of the cylindrical pipe.

The reactor body may include a side wall part, a cover part, and a bottom part, and the discharge nozzle may be located in the bottom part between the rotation shaft and the side wall part.

The batch reactor includes at least one pair of baffles positioned to be spaced apart from each other about the rotation axis, and from the discharge nozzle of the pair of baffles in a baffle positioned close to the discharge nozzle among the pair of baffles The distance between the adjacent pipes may be smaller than that of the baffles located farther away.

In the baffle positioned close to the discharge nozzle among the pair of baffles, a distance between adjacent pipes may be 0.5 to 1 times a diameter of the pipe.

A distance between adjacent pipes in a baffle positioned far from the discharge nozzle among the pair of baffles may be 0.5 to 2 times a diameter of the pipe.

A distance between adjacent pipes in a baffle positioned far from the discharge nozzle among the pair of baffles may be 1 to 1.3 times a diameter of the pipe.

According to embodiments of the present invention, it is possible to provide a batch reactor that maintains optimal flow performance and heat removal performance in an industrial site through a double pipe type baffle structure.

In addition, it is possible to provide a batch-type reactor capable of efficiently stirring the reaction fluid through a multi-stage structure by a plurality of stirrers and maintaining a uniform flow of the reaction fluid.

1 is a schematic diagram of a batch reactor according to Example 1 of the present invention.
FIG. 2 is a schematic cross-sectional view of a batch reactor taken along line I-I' of FIG. 1 .
3 is a schematic cross-sectional view of a batch reactor according to Example 2 of the present invention.
4 is a schematic cross-sectional view showing a batch reactor according to a comparative example.
5 is a turbulent dissipation rate distribution diagram of Examples 1, 2 and Comparative Examples.
6 is a schematic diagram of a batch reactor showing the lower end of FIG. 1 .
7 shows the volume fraction of the slurry according to time at P1 to P10 of FIG. 6 .
FIG. 8 shows the accumulated amount of slurry during the initial 20 seconds in P1 to P10 of FIG. 6 .

Hereinafter, with reference to the accompanying drawings, various embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in several different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar. In order to clearly express various layers and regions in the drawings, the thicknesses are enlarged. And in the drawings, for convenience of description, the thickness of some layers and regions are exaggerated.

Further, when a part of a layer, film, region, plate, etc. is said to be “on” or “on” another part, it includes not only cases where it is “directly on” another part, but also cases where another part is in between. . Conversely, when we say that a part is "just above" another part, we mean that there is no other part in the middle. In addition, to be "on" or "on" the reference part means to be located above or below the reference part, and to necessarily mean to be located "on" or "on" in the direction opposite to the gravitational force not.

In addition, throughout the specification, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

In addition, throughout the specification, when referring to "planar", it means when the target part is viewed from above, and "cross-sectional" means when viewed from the side when a cross-section of the target part is vertically cut.

1 is a schematic diagram of a batch reactor according to Example 1 of the present invention, and FIG. 2 is a schematic cross-sectional view of the batch reactor taken along line I-I' in FIG. 1 .

1 and 2, the batch reactor 100 according to Example 1 of the present invention is stirred with the reactor body 120, the stirring device 130, the discharge nozzle 150, and the inner wall of the reactor body 120. and a baffle 140 positioned between the apparatus 130 along the circumferential direction of the reactor body 120 .

The batch reactor 100 may be, for example, a polymerization reactor for polymer polymerization. The reactor body 120 is not limited in shape, but preferably has a cylindrical structure, and may include a side wall portion 121 , a bottom portion 122 , and a cover portion 123 . Although not shown, the reactor body 120 is formed in a double-wall structure so that a fluid can circulate inside the double-wall, and heat exchange between the fluid and the reactant can be made. That is, a heat exchange jacket may be installed in the reactor body 120 .

The stirring device 130 is installed inside the reactor body 120 to rotate the reactants 110, stirrers 133, 134, 135, and a motor 131 for rotating the stirrers 133, 134, 135 and a motor ( 131) and a single rotating shaft 132 connecting the stirrers 133, 134, and 135.

According to Embodiment 1 of the present invention, the stirring device 130 includes three stirrers 133, 134, and 135, but at least two stirrers are positioned at regular intervals along the height direction of the rotating shaft 132 at regular intervals. When a batch reactor of a multi-stage structure is formed, the number of stirrers is not particularly limited. It is important for the batch reaction process to produce a uniform product, and the stirrers 133 , 134 , 135 according to Example 1 of the present invention are positioned at regular intervals along the height direction of the rotation shaft 132 to form a multi-stage structure. , it is possible to effectively stir the reactants compared to the one end structure having one stirrer, and to maintain the flow of the reactants uniformly in each zone. Therefore, it is possible to ultimately produce a uniform product, increase productivity, and improve product quality stability.

The stirring performance of the stirrers 133 , 134 , 135 affects the reaction performance of the batch reactor 100 . The agitators 133, 134, and 135 may be configured in the form of a paddle type, a propeller type, and a turbine type stirring blade form, and in FIGS. 1 and 2, a paddle type stirring blade is configured. Although the stirrers 133 , 134 , and 135 are illustrated as an example, it is not particularly limited as long as it has a structure capable of effectively mixing the reactants 110 . The number of stirring blades is not particularly limited, but may consist of 2 to 4 blades.

The baffle 140 changes the circumferential flow of the reactant 110 according to the rotation of the stirrers 133 , 134 , and 135 into a vertical flow to improve mixing of the reactant 110 . In addition, the baffle 140 is composed of a pipe through which a fluid for heat exchange, such as cooling water, flows therein. It is responsible for the function, that is, the heat removal function.

The fluid for heat exchange may have a temperature of about 4 to 35 degrees Celsius in the case of a low temperature, and may have a temperature of about 50 to 200 degrees Celsius in the case of a high temperature.

A plurality of baffles 140 are disposed at a distance from each other along the circumferential direction of the reactor body 120 . That is, the plurality of baffles 140 are installed along the circumferential direction of the reactor body 120 at a predetermined distance from the stirrers 133 , 134 , and 135 , and are preferably installed at equal intervals along the circumferential direction.

Each baffle 140 may include a plurality of pipes, and each of the pipes may have a cylindrical shape. The pipes of each baffle 140 are separated from each other and are located in a line along the radial direction of the reactor body 120 when viewed in a plan view. The baffle 140 according to the first embodiment of the present invention has a structure including two pipes composed of a first pipe 141 and a second pipe 142 . Referring to FIG. 1 , the first pipe 141 and the second pipe 142 are separated from each other, and a fluid for heat exchange flows along each path. The first pipe 141 and the second pipe 142 may each penetrate through the bottom 122 of the reactor body 120 and be connected to a cooling water outlet (not shown), and may each be connected to a side wall of the reactor body 120 . It may be connected to a cooling water inlet (not shown) by passing through 121 . However, the portion penetrating through the reactor body 120 is not significantly limited, and the cover portion 123 and the bottom portion 122, the cover portion 123 and the sidewall portion 121, the sidewall portion 121 and the sidewall portion ( 121) can be penetrated. If the cooling water outlet and the cooling water inlet are also connected one by one for each pipe, the location is not limited, so the first pipe 141 and the second pipe 142 passing through the bottom 122 of the reactor body 120 are connected to the cooling water inlet. The first pipe 141 and the second pipe 142 passing through the side wall portion 121 of the reactor body 120 may be connected to the cooling water outlet.

Since the first pipe 141 and the second pipe 142 are not connected to each other and the fluid for heat exchange flows along each path, a surface treatment process for improving heat removal performance can be easily performed.

Each of the baffles 140 may include a plurality of pipes, and are positioned in a line along the radial direction of the reactor body 120 when viewed in a plan view. Referring to FIG. 2 , in Example 1 of the present invention, the baffle 140 includes a first pipe 141 and a second pipe 142 , and the first pipe 141 and the second pipe 142 are the reactors. They are positioned in a line along the radial direction of the body 120 .

3 is a schematic cross-sectional view of a batch reactor according to Example 2 of the present invention. The batch reactor 200 according to the second embodiment of the present invention has the same or similar configuration to the batch reactor 100 according to the first embodiment of the present invention, except for the number of pipes included in each baffle. Referring to FIG. 3 , the batch reactor 200 includes a reactor body 220 and a baffle 240 , and the baffle 240 includes a first pipe 241 , a second pipe 242 , and a third pipe 243 . ) is included. The first pipe 241 , the second pipe 242 , and the third pipe 243 are positioned in a line along the radial direction of the reactor body 220 .

4 is a schematic cross-sectional view showing a batch reactor according to a comparative example of the present invention. Referring to FIG. 4 , the batch reactor 300 according to the comparative example of the present invention includes a reactor body 320 and a baffle 340 , and the baffle 340 includes a first pipe 341 and a second pipe 342 . ) and a third pipe 343 . The first pipe 341 , the second pipe 342 , and the third pipe 343 are formed in a triangular pattern at a predetermined distance from each other to form a cross-array structure.

5 is a turbulent dissipation rate distribution diagram of Examples 1, 2 and Comparative Examples. Referring to FIG. 5 , in the pipe of the cross-arranged structure according to the comparative example of the present invention, sufficient turbulence energy is not transmitted to the pipe located at the outermost side compared to the pipe of the line structure according to Examples 1 and 2 of the present invention. can confirm. Accordingly, it can be confirmed that the pipe of the cross-arranged structure has lower heat removal performance compared to the pipe of the in-line structure.

In terms of heat removal performance, it is preferable that the baffle includes a pipe in a line structure, and the number of pipes is not particularly limited as long as it is at least two or more. However, as the number of pipes increases, the path through which the coolant flows increases, which may be effective in heat removal performance. The amount of slurry formed between the tubing and the tubing may increase. If smooth washing is not performed properly due to the increased amount of slurry, non-ideal reactions may occur in the subsequent polymerization process. Therefore, in order to minimize the restrictions in the industrial field as described above, it is preferable that the number of pipes is two.

Referring back to FIG. 1 , the batch reactor 100 according to Embodiment 1 of the present invention may further include a discharge nozzle 150 . The discharge nozzle 150 may be located at the bottom 122 of the reactor body 120 . Specifically, the discharge nozzle 150 may be located between the rotation shaft 132 and the side wall portion 121 in the bottom portion 122 of the reactor body 120 . The discharge nozzle 150 is responsible for draining the reactant 110 in which the reaction is completed, and after the reactant 110 in which the reaction is completed is drained through the discharge nozzle 150, it is produced as a final product through purification and drying processes. .

Referring again to FIG. 2 , it is preferable that the interval (X) between adjacent pipes among the pipes constituting each baffle 140 is 0.5 to 2 times the diameter of the pipe. If the gap (X) between the pipes is less than 0.5 times the diameter, the amount of slurry formed between the reactant and the pipe at the bottom of the pipe may increase. Since sufficient space between adjacent pipes is not secured, it causes an imbalance in the overall flow characteristics.

6 is a schematic diagram of a batch reactor showing the lower end of FIG. 1 . A pair of baffles 140 are spaced apart from each other at portions corresponding to each other with respect to the rotation shaft 132 , and a first pipe 141 and a second pipe constituting one baffle 140 among the pair of baffles. 142 is also arranged substantially parallel to the axis of rotation 132, with respect to each of the first pipe 141 and the second pipe 142 constituting the other baffle 140 with respect to the axis of rotation 132, respectively. It may be located in the corresponding part. The first pipe 141 and the second pipe 142 may be arranged separately from each other.

P1, P3, P5, P7 and P9 are the first pipe 141 and the second pipe 142, the side wall part 121 and the discharge nozzle ( 150), points between neighboring components are shown. P2, P4, P6, P8, and P10 are the first pipe 141 and the second pipe 142 included in the baffle 140 located relatively far from the discharge nozzle 150, the rotation shaft 132 and the side wall part ( 121), points between neighboring components are shown.

7 is a graph showing the volume fraction of the slurry according to time at P1 to P10 of FIG. 6 . Specifically, the volume ratio of the slurry according to time in P1 to P10 is shown by dividing the case where the interval between the pipes is the same as the pipe diameter and 1.3 times the pipe diameter.

FIG. 8 shows the slurry accumulation during the initial 20 seconds in P1 to P10 of FIG. 6 . Specifically, the slurry accumulation during the initial 20 seconds in P1 to P10 is shown by dividing the case where the distance between the pipes is equal to the pipe diameter and 1.3 times the pipe diameter.

Referring to FIGS. 7 and 8 , a phenomenon in which the slurry is accumulated at the beginning of the reaction up to 20 seconds after the start of the reaction occurs, and is drained together with the reactant fluid over time. The initially accumulated slurry is a factor that inhibits the mixing of reactants.

In the case of points P1, P3, P5, P7 and P9 that are relatively close to the discharge nozzle 150, if the distance between the pipes is the same as the pipe diameter, the amount of accumulated slurry is relatively small, and the amount of slurry is relatively small and relatively far from the discharge nozzle 150 At points P2, P4, P6, P8, and P10, the amount of accumulated slurry is relatively small when the spacing between the pipes is 1.3 times the pipe diameter.

Therefore, it is preferable that the distance between the adjacent pipes of the discharge nozzle 150 and the baffle 140 located closer to each other than the baffle 140 located far from the discharge nozzle 150 is smaller, specifically, the discharge nozzle 150 . ) and the baffle 140 located close to the pipe has a spacing of 0.5 to 1 times the diameter of the pipe, and the baffle 140 positioned far from the discharge nozzle 150 has a spacing between the pipes 0.5 to 2 times the diameter of the pipe. It is more preferable that it is 2 times, or 1 times to 1.3 times.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. is within the scope of the

100: batch reactor
120: reactor body
133, 134, 135: agitator
140: baffle
141: first pipe
142: second pipe

Claims (8)

cylindrical reactor body;
stirring device;
discharge nozzle; and
and a baffle positioned along the circumferential direction of the reactor body between the inner wall of the reactor body and the stirring device,
The stirring device includes at least two stirrers and one rotating shaft,
The baffle includes at least two or more pipes,
The pipes are separated from each other and located in a line along the radial direction of the reactor body,
The reactor body includes a side wall portion, a cover portion and a bottom portion,
The discharge nozzle is located between the rotation shaft and the side wall part of the bottom part.
At least one pair of baffles are positioned to be spaced apart from each other about the axis of rotation,
In a baffle located closer to the discharge nozzle among the pair of baffles, a distance between adjacent pipes is smaller than that of the pair of baffles located farther from the discharge nozzle among the pair of baffles. In claim 1,
The at least two or more stirrers are positioned at regular intervals along the height direction of the rotation shaft. In claim 1,
Each of the pipes is cylindrical,
A spacing between the adjacent cylindrical pipes is 0.5 to 2 times the diameter of the cylindrical pipe. delete delete In claim 1,
In a baffle positioned close to the discharge nozzle among the pair of baffles, an interval between adjacent pipes is 0.5 to 1 times the diameter of the pipe. In claim 1,
In a baffle positioned far from the discharge nozzle among the pair of baffles, an interval between adjacent pipes is 0.5 to 2 times the diameter of the pipe. In claim 7,
In a baffle positioned far from the discharge nozzle among the pair of baffles, an interval between adjacent pipes is 1 to 1.3 times the diameter of the pipe.

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