JP3471386B2 - Fluid mixing cooling device - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a multi-stage reactor in which an exothermic chemical reaction such as an alkylation reaction, a hydrodesulfurization reaction, a hydrocracking reaction, a hydrorefining reaction, a hydrogenation reaction of an unsaturated compound is carried out. , Reaction fluid in this multi-stage reactor
The present invention relates to a fluid mixing and cooling device that mixes and cools (liquid) .

[0002]

As is well known, a two-phase exothermic reaction of a gas phase and a liquid phase may be carried out in a fixed bed reactor. In such a case, heat of reaction is generated by the exothermic reaction, and the temperature of the reaction fluid in the reaction bed in the fixed bed reactor is excessively increased, whereby the catalyst for promoting the reaction is deteriorated and the selectivity of the reaction is lowered. There is a problem that the yield of the target product decreases.
Further, in a reactor having a large cross-sectional area, the flow of the reaction fluid may be biased in the process of flowing down the catalyst bed. In such a case, the product composition and the temperature of the fluid in the radial direction of the reactor may be different due to vaporization of a part of the liquid phase due to an excessive temperature rise.

Therefore, an apparatus and method for cooling the reaction fluid and mixing the reaction fluid by dividing the reaction layer in the reactor into a plurality of stages and disposing a cooling device between the reaction stages have been proposed. ing. As an example of this, Japanese Patent Publication No. 57
No. 22614, Japanese Patent Publication No. 57-26815, Japanese Patent Publication No. 60-7532, and Japanese Patent Laid-Open No. 4-22
No. 7040 publication is shown.

In Japanese Patent Publication No. 57-22614, a wall portion is provided between the reaction layer and the reaction layer to define an inner partition chamber and an outer partition chamber. A wall portion between the inner partition chamber and the outer partition chamber has a passage, and is provided with a roof portion in which both end portions are high and a central portion forms a valley portion. The roof of this valley portion has a passage formed by a large number of small holes communicating with the inner partition chamber, and further has a floor having a passage in the portion that defines the outer partition chamber for a multistage forward hydrogen contact reaction. A quench box is disclosed. In this quench box, cooling gas is supplied from the top of the quench box, and this cooling gas, together with the reaction fluid flowing down from the upper reaction layer, passes through a passage provided on the roof of the valley, It flows into the inner compartment.

In Japanese Patent Publication No. 57-26815, a partition plate having a weir at the edge of an opening is fixed to a tower wall, and a porous plate having a cap-like portion covering the weir is provided slightly above the partition plate. A flow path passing through the opening, the gap between the weir and the cap, and the gap between the partition plate and the perforated plate, and a catalyst is accommodated on the perforated plate to form a reaction layer. There is disclosed a multi-stage exchange reaction tower in which the upper and lower reaction layers are provided in multiple stages and the upper and lower reaction layers are connected by an overflow pipe. In this multi-stage exchange reaction tower, water flows from the upper part of the tower through the overflow pipe to the catalyst layer on the partition plate, and the water overflowing from this catalyst layer flows to the lower part through the next overflow pipe. On the other hand, a gas is caused to flow between the partition plate and the perforated plate, and this gas pushes up the water in the catalyst layer from the perforated plate to stir the water.

JP-B-60-7532 discloses a plurality of branch pipes having a quench header for a cooling gas provided in the center of a reaction tower and gas injection small holes arranged substantially horizontally and radially from the quench header. And a quench distributor having a liquid retention weir below it. In this device, the reaction fluid combined with the cooling gas flows down through a wide gap between the liquid retention weir and the inner wall of the reaction tower.
It is possible to avoid an increase in pressure loss in this portion and the occurrence of pulsating flow.

Japanese Unexamined Patent Publication (Kokai) No. 4-227040 discloses an improved inter-zone mixing apparatus for mixing a cooling gas supplied from the outside with a reaction fluid in a space between two reaction zones. In this mixing device, the cooling gas and the reaction fluid are united in a limited space area, and when the united fluid is introduced into the cylindrical cap placed on the plate, the flow is disturbed to cause mixing efficiency. Is increased.

[0008]

However, in the quench box of Japanese Patent Publication No. 57-22614, since the reaction fluid and the cooling gas pass together through the passage of the small hole provided in the roof of the valley, Depending on the operating conditions, the pressure loss at this portion becomes large, and there is a risk of pulsating flow generation and blockage of the small holes by the solid substances contained in the reaction fluid. There is also a problem that the structure is complicated.

In the multi-stage exchange reaction column of Japanese Patent Publication No. 57-26815, an overflow pipe connecting the upper and lower reaction layers is provided between the column wall and the edge of the partition plate. A swirl flow cannot be generated around the overflow pipe when the fluid flows into the pipe. Therefore, the mixing efficiency in the reaction layer cannot be improved. Then, a gas is caused to flow from the opening located at the center of the partition plate, and this gas pushes up water and flows upward from the perforated plate, so that a large amount of gas flows to the center of the perforated plate located around the opening, The amount of gas flowing through the edge of the perforated plate was reduced, the gas flow was unevenly distributed, and the gas could be unevenly dispersed from the perforated plate. Therefore, the heat exchange efficiency of the gas may not be improved.

In the quench distributor disclosed in Japanese Patent Publication No. Sho 60-7532, it is necessary to increase the pressure difference between the injection holes in order to uniformly inject the cooling gas from the injection holes of the cooling gas injection branch pipe. Therefore, the flow velocity of the cooling gas injected from the injection holes is increased, and the contact time between the cooling gas and the reaction liquid is shortened. Further, since the branch pipes are radially arranged, the number of injection holes per unit cross-sectional area decreases from the central portion to the outer peripheral portion, so that the cooling gas is not uniformly blown into the cooling gas. There was a problem that the heat exchange rate with the reaction solution was low. The mixing device disclosed in JP-A-4-227040 has a problem that the structure is complicated and the heat exchange rate between the cooling gas and the reaction fluid is low.

The present invention effectively solves the above-mentioned problems by reducing the pressure loss of the cooling gas and using the cooling gas and the liquid.
An object of the present invention is to provide a fluid mixing and cooling device having a simple structure while improving the heat exchange rate with a reaction fluid.

[0012]

Fluid mixing cooling device SUMMARY OF THE INVENTION The first aspect is disposed between each reaction stage of a multistage reactor, liquid
In a fluid mixing and cooling device for mixing and cooling a reaction fluid of a body and a cooling gas for cooling the reaction fluid, a partition plate for partitioning the fluid mixing and cooling device into an upper part and a lower part, and a partition plate arranged in parallel above the partition plate. A perforated plate for holding the reaction fluid, and a partition plate and a perforated plate penetrating the perforated plate so as to project above the perforated plate .
One or a plurality of overflow pipes that are introduced from the side opening and flow out to the lower portion, and are arranged between the partition plate and the perforated plate,
An inflow pipe into which cooling gas flows and formed on the partition plate.
A drain hole for letting out the liquid leaking from the perforated plate;
And a side opening position of the overflow pipe cools the reaction fluid.
It is characterized in that the height of a holding tank for performing cooling and mixing is defined, and a plurality of ejection holes for ejecting cooling gas are formed in the perforated plate.

A fluid mixing and cooling device according to a second aspect of the invention is characterized in that the ejection holes are formed obliquely with respect to an axis orthogonal to the perforated plate. The fluid mixing and cooling device according to claim 3 is characterized in that the porous plate is formed in an opening area in which a pressure loss when the cooling gas is ejected from the ejection hole is set to 5 mm or more of a water column. is there.

According to a fourth aspect of the fluid mixing and cooling device of the present invention, the perforated plate has a linear flow velocity of cooling gas ejected from the ejection holes of 20 m.
It is characterized in that it is formed with an opening area set to be less than or equal to / second. Further, it is preferable that the overflow pipe is formed so that the protruding height from the perforated plate is 20 mm or more.

[0015]

According to the fluid mixing and cooling device of the present invention, the fluid mixing and cooling device is divided into an upper portion and a lower portion by a partition plate, and a liquid reaction fluid is held by a perforated plate arranged in parallel above the partition plate. To be done. Cooling gas is introduced from the inflow pipe between the partition plate and the perforated plate, and the cooling gas ejects from the ejection holes of the perforated plate, so that the cooling gas passes through the reaction fluid and mixes the reaction fluid. Cooling. And the overflow pipe is at the top
The reaction fluid located above the perforated plate is discharged from the side opening near the section to the lower part of the partition plate to cool and cool the reaction fluid.
Specifies the height of the holding tank for mixing and mixing. Also, is it a perforated plate?
The liquid that leaks from the partition and flows out to the partition plate will form on this partition plate.
It flows out from the drain hole made.

In the fluid mixing and cooling device according to the second aspect, in addition to having the function of the first aspect, the cooling gas is jetted obliquely to the reaction fluid on the perforated plate from the jet holes, and the reaction fluid is cooled diagonally. The reaction fluid is mixed by passing the gas. According to the fluid mixing and cooling device of the third aspect, in addition to having the action of the first aspect, the pressure loss when ejecting the cooling gas from the ejection holes of the perforated plate is set to 5 mm or more of water column. The flow rate of the cooling gas passing therethrough is prevented from changing with time, and the cooling gas is uniformly dispersed in the reaction fluid.

In the fluid mixing and cooling device according to the fourth aspect, in addition to having the action according to the first aspect, the linear flow velocity of the cooling gas ejected from the ejection holes of the perforated plate is set to 20 m / sec or less. Can be jetted finely into the reaction fluid, and the contact efficiency between the cooling gas and the reaction fluid can be improved. Further, the overflow pipe is formed so that the protruding height from the perforated plate is 20 mm or more, so that the contact time between the reaction fluid and the cooling gas is sufficiently secured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fluid mixing and cooling device of the present invention will be described below with reference to FIGS. As shown in FIG. 1, reference numeral 10 is a fluid mixing and cooling device,
The fluid mixing / cooling device 10 is arranged between the reaction stages of the multi-stage reactor 11, and has a partition plate 12 for partitioning the fluid mixing / cooling device 10 into an upper part and a lower part, and an upper part of the partition plate 12. Perforated plates 1 arranged in parallel with each other and holding a liquid reaction fluid
4, an overflow pipe 15 penetrating the partition plate 12 and the perforated plate 14, an inflow pipe 16 for allowing cooling gas to flow between the partition plate 12 and the perforated plate 14, and a gate formed on the partition plate 12.
It is configured to have a rain hole 17 .

The multi-stage reactor 11 is formed in a descending parallel flow type fixed bed for descending the reaction fluid from the upper portion to the lower portion and raising the cooling gas in parallel with the reaction fluid. The multi-stage reactor 11 is provided with a partition plate 12 that divides the fluid mixing and cooling device 10 arranged between the reaction stages of the multi-stage reactor 11 into an upper part and a lower part. This partition plate 12
They are arranged in a substantially horizontal direction orthogonal to the standing direction of the multi-stage reactor 11. The partition plate 12 is provided with a drain hole 17 for allowing the liquid leaking from the porous plate 14 onto the partition plate 12 to flow out to the lower part of the partition plate 12. This partition plate 12
A perforated plate 14 is juxtaposed above each other, and the partition plate 12 and the perforated plate 14 are juxtaposed with a distance equal to or larger than the diameter of the inflow pipe 16. Here, if the space between the partition plate 12 and the perforated plate 14 is formed to be larger than necessary, the volume of the fluid mixing and cooling device 10 is formed to be large, which is not preferable.

As shown in FIG. 2, the perforated plate 14 has a plurality of ejection holes 18 penetrating the perforated plate 14.
The ejection holes 18 are formed uniformly over the entire perforated plate 14, and the cooling gas that has flowed in from the inflow pipe 16 is ejected so that the cooling gas flows out over the entire reaction fluid. This spout 18
3 is formed obliquely with respect to an axis (here, a substantially vertical axis) orthogonal to one surface of the porous plate 14, as shown in FIG. Here, the ejection holes 18 may be formed parallel to an axis orthogonal to one surface of the perforated plate 14, but by forming them obliquely, the reaction fluid on the perforated plate 14 is stirred in the horizontal direction. Are accelerated by the jetting energy of the cooling gas. Further, although the shape of the ejection hole 18 is formed in a circular shape, it is not particularly limited and may be a polygonal shape such as a triangle or a quadrangle.

As shown in FIG. 1, the overflow pipe 15 penetrates through the central portions of the partition plate 12 and the perforated plate 14, respectively, and a pipe main body 20 projectingly arranged above the perforated plate 14, It is composed of a lid portion 21 that covers an opening portion of the upper end portion of the pipe body 20. The upper part of the pipe body 20 is the perforated plate 1
4 to 20 mm to 400 mm projectingly formed, a plurality of suction ports 22 serving as side surface openings are formed on the side wall near the projecting upper end part , and the lower end part is fixed to the central part of the partition plate 12, and the lower part of the partition plate 12 It is configured to communicate with the space. That is, the reaction fluid directly flows into the pipe body 2 at the lid portion 21.
The reaction fluid mixed and cooled on the perforated plate 14 is prevented from flowing into 0 and flows into the suction port 22 from the upper layer. The reaction fluid and the cooling gas jetted into the reaction fluid flow into the suction port 22, and the reaction fluid and the cooling gas flow out through the pipe body 20 to the lower portion of the partition plate 12. Although the suction port 22 is formed in the pipe body 20, the lid part 21 is separately supported by a support or the like, and
0 is opened at the upper end of the outer peripheral wall of the pipe body 20
Even if a suction port that becomes a side opening is formed between the lid 21 and the lid 21.
Good.

The area of the opening of the overflow pipe 15 (the pipe body 2
0 cross section area) is 0.5% to 10% of the area of the perforated plate 14.
It is preferably set to%. If the area of the opening of the overflow pipe 15 is set to 0.5% or less, under normal operating conditions, the flow rate of the reaction fluid flowing through the opening of the overflow pipe 15 per unit cross-sectional area becomes large, resulting in a pressure loss. Is increased and there is a risk of pulsating flow, which is not preferable. Also, although there is little problem if the area of the opening of the overflow pipe 15 exceeds 10%, if the area of the opening of the overflow pipe 15 is set larger than necessary, the dispersion area of the cooling gas decreases, It is not preferable to set the area of the opening of the overflow pipe 15 larger than necessary.

The height at which the pipe body 20 of the overflow pipe 15 projects from the perforated plate 14 is related to the flow velocity of the reaction fluid per cross-sectional area of the multi-stage reactor 11 and the supply rate of the cooling gas. It is determined in consideration of the amount of heat removed from the reactor and the mixed state of the reaction fluid in the multistage reactor 11 in the inner diameter direction.
For example, when the flow rate of the reaction fluid per unit cross-sectional area is small and the amount of heat removed from the reaction fluid is small, the overflow pipe 15
The projecting height of may be set to about 20 mm. on the other hand,
When the flow rate of the reaction fluid is large and the amount of heat removed from the reaction fluid is also large, it is preferable to set the protruding height of the overflow pipe 15 to be high. However, under normal operating conditions, heat exchange and mixing of the reaction fluid in the inner diameter direction of the multi-stage reactor 11 are almost completed at a height of about 400 mm, so that when the protruding height of the overflow pipe 15 exceeds 400 mm, It is not preferable in that the pressure required for jetting the cooling gas increases, the volume for cooling the reaction fluid increases, and the fluid mixing and cooling device 10 becomes large.

The lid portion 21 may be formed in such a size that the reaction fluid flowing down from above the perforated plate 14 can be prevented from directly entering the pipe body 20 of the overflow pipe 15. Therefore, the shape of the lid portion 21 is not particularly limited, and preferably has a shape similar to the pipe body 20. And
The area of the lid portion 21 is preferably not less than the cross-sectional area of the pipe body 20 and not more than four times the cross-sectional area of the pipe body 20. When the area of the lid portion 21 is formed to be equal to or smaller than the cross-sectional area of the pipe body 20, the reaction fluid flows directly from the upper part of the porous plate 14 to the pipe body 20, which is not preferable. If the area of the lid portion 21 is formed four times or more, the flow path of the reaction fluid flowing down the perforated plate 14 is obstructed, which is not preferable.

The inflow pipe 16 has one end connected to a gas supply device or the like and the other end fixed to the multi-stage reactor 11 between the partition plate 12 and the perforated plate 14 for cooling gas. 1
2 and the perforated plate 14 are made to flow into the space. The inflow pipe 16 is not limited to one, and may be plural. By providing a plurality of inflow pipes 16, the flow rate of the cooling gas flowing through each inflow pipe 16 can be reduced, so that the diameter of the inflow pipe 16 can be made small.
The distance between the partition plate 12 and the perforated plate 14 can be narrowed. Therefore, the volume of the fluid mixing and cooling device 10 can be reduced, and the fluid mixing and cooling device 10 can be downsized.

On the other hand, the cooling chamber 2 in which the cooling gas is retained by the partition plate 12, the porous plate 14 and the inner wall of the multi-stage reactor 11.
3, the porous plate 14, the inner wall of the multi-stage reactor 11 and the outer peripheral wall of the pipe body 20 of the overflow pipe 15 constitute a retention tank 24 for retaining the reaction fluid. This retention tank 24
At the side opening position where the suction port 22 of the overflow pipe 15 is provided.
The height of the reaction fluid is regulated in the retention tank 24, and the reaction fluid is cooled and retained in the retention tank 24 for a time required for mixing in the inner diameter direction of the multi-stage reactor 11.

On the other hand, in consideration of the number of ejection holes 18 of the perforated plate 14, the cross-sectional area of each ejection hole 18, the pressure of the cooling gas introduced into the inflow pipe 16, etc., the opening area of the ejection holes 18 with respect to the perforated plate 14 as a whole. Is preferably adjusted as follows. The porous plate 14 is formed in an opening area in which the pressure loss when the cooling gas is ejected from the ejection hole 18 is set to 5 mm or more of the water column. When the pressure loss of the cooling gas in the perforated plate 14 is set to 5 mm water column or less, the flow rate of the cooling gas passing through the perforated plate 14 starts to fluctuate with time, which hinders the uniform dispersion of the cooling gas. Although the upper limit of the pressure loss cannot be specified from the viewpoint of the dispersion of the cooling gas, when the pressure loss in the perforated plate 14 is larger than necessary, the power required for introducing the cooling gas is greatly consumed. Therefore, it is preferable to set the pressure loss in the perforated plate 14 to 40 mm or less of water column. The perforated plate 14 is formed in an opening area in which the linear velocity of the cooling gas ejected from the ejection holes 18 is set to 20 m / sec or less. If the linear velocity of the cooling gas is set to 20 m / sec or more, the cooling gas cannot be finely dispersed in the reaction fluid due to a flooding phenomenon or the like, and the contact efficiency between the reaction fluid and the cooling gas decreases.

In such a fluid mixing and cooling device 10, the liquid
The reaction fluid as a body flows into the retention tank 24 on the perforated plate 14 from the upper part of the fluid mixing and cooling device 10. Here, the gas in the reaction fluid is separated, and this gas is combined with the reaction fluid on the perforated plate 14 and the cooling gas ejected on the perforated plate 14 and flows down from the suction port 22 of the overflow pipe 15 to the lower part. To do. On the other hand, in the retention tank 24, the cooling gas such as air is supplied to the cooling chamber 2.
3 is ejected into the reaction fluid through the ejection holes 18 of the porous plate 14. At this time, the reaction fluid and the bubbles of the cooling gas are brought into contact with each other, the heat of the reaction fluid is transferred to the cooling gas, and the reaction fluid is cooled. Since the cooling gas is dispersed in the reaction fluid by the porous plate 14, the contact area between the reaction fluid and the cooling gas is increased, and the reaction fluid is cooled by the cooling gas.

By jetting the cooling gas upward from below the perforated plate 14, it is possible to prevent solid substances contained in the reaction fluid from clogging the ejection holes 18 of the perforated plate 14, and to eject the perforated plate 14. The hole 18 can be prevented from being blocked. Since the reaction fluid is agitated by the jet energy of the cooling gas, the contact efficiency of the gas (cooling gas) -liquid (reaction fluid) can be improved, and the mixing of the reaction fluid is promoted, so that the retention tank The temperature of the reaction fluid in 24 can be made uniform.

Furthermore, when the reaction fluid flows down from the overflow pipe 15, a swirl flow is generated in the reaction fluid around the pipe body 20 of the overflow pipe 15. Therefore, the reaction fluids can be mixed in a substantially horizontal direction, and the temperature uniformity in the mixing of the reaction fluids can be promoted. In addition, the overflow pipe 15
Since the perforated plate 14 is arranged at the center of the perforated plate 14, the retention tank 24
A swirling flow can be generated in the central part of the
Mixing of the reaction fluids within can be further facilitated.

Experimental Example 1 A fluid mixing and cooling device was installed in a cylindrical multi-stage reactor having a diameter of 1000 mm. The mixed state in the inner diameter direction of the perforated plate of this fluid mixing and cooling device was examined. Here, ejection holes having a hole diameter of 6 mmΦ and a number of holes of 156 were formed on the perforated plate. Further, the overflow pipe was set to have a protruding height of 60 mm with respect to the perforated plate, and one overflow pipe was arranged at the center of the perforated plate.

Then, while feeding air (cooling gas) from below the perforated plate, water (reaction fluid) is poured into the retention tank until it flows out from the suction port of the overflow pipe, and about 45 liters of water is filled in the retention tank. did. With the air thus circulated, saline was injected in a rectangular wave form from the tracer injecting tube, and the change in conductivity of the saline was measured at each measuring portion on the perforated plate.
Here, the perforated plate shown in FIG. 4 indicates three measurement parts on the perforated plate, and X indicates the tracer injection position. The results of these measurements are shown in FIG.

FIG. 5 shows the relationship between the conductivity and the elapsed time. The measurement result of is plotted by Δ and the measurement result of is indicated by ○.
Is plotted, and the measurement result of is plotted with ◇. Figure 5
As is clear from the measurement results of about 3,
It was found that the concentration of saline solution in the retention tank became constant at 0 seconds.

(Experimental Example 2) In Experimental Example 2, the height of the overflow pipe protruding from the perforated plate is different from that of Experimental Example 1, and the other devices and methods are the same. Here, the protrusion height of the overflow pipe was changed from 30 mm to 300 mm, and the time (concentration of liquid mixing) during which the concentration of the saline solution became constant at the protrusion height of each overflow pipe was measured. The results of these measurements are shown in FIG.

FIG. 6 shows the relationship between the liquid mixing time and the height of the overflow pipe. As is clear from FIG. 6, it was found that the liquid mixing time became shorter as the height of the overflow pipe became higher. From this measurement result, the processing capacity was calculated from the amount of staying liquid in the staying tank and the residence time required for uniform mixing. When the height of the overflow pipe was 30 mm, 2.7 kl / hour, the height of the overflow pipe was calculated. Of 300 mm is 75 kl / hour, which satisfies the processing capacity required in a normal reactor.

However, when the height of the overflow pipe is lowered, the liquid mixing time tends to be drastically lengthened, so that the height of the overflow pipe is preferably 20 mm or more. Further, when the height of the overflow pipe becomes high, the liquid mixing time becomes short, but when the height of the overflow pipe exceeds 400 mm, the volume of the retention layer becomes large, and when the air (cooling gas) is inserted. This is not preferable because pressure loss increases.

(Experimental Example 3) Using the apparatus of Experimental Example 1, hot water at 50 ° C. was continuously flowed down from above the perforated plate at 90 l / min, and 14 m ^{3 of} room temperature air was passed through the perforated plate.
/ Min, or 57 m ³ / min. At this time, the temperature difference between the water temperature in the liquid receiving container provided below the overflow pipe and the vapor phase air was measured. This measurement result showed that the water temperature and the air temperature were in the same error range in all cases, and that heat exchange between the hot water and the air was sufficiently achieved.

<Other Embodiments> Another embodiment of the fluid mixing and cooling device of the present invention will be described with reference to FIG.
The other embodiment shown in FIG. 7 is different from the above embodiment in the overflow pipe, and the other structure is the same as the above embodiment. As shown in FIG. 5, the overflow pipes are arranged at equal intervals from the first overflow pipe 31 arranged in the central portion of the perforated plate 14, and are evenly spaced from each other. The second overflow pipe 32 is arranged at a distance. The first overflow pipe 31 and the second overflow pipe 32 are formed in the same shape.

By providing a plurality of overflow pipes 31 and 32 in this way, the opening area of the overflow pipes can be increased and the surrounding area of the overflow pipes when the reaction fluid flows down in the overflow pipes. The number of swirling flows generated in the reaction fluid can be increased, and the mixing of the reaction fluid in the retention tank can be significantly promoted.

[0040]

As described above, according to the fluid mixing and cooling device of the present invention, the following effects can be obtained.
According to the fluid mixing and cooling device of claim 1, a partition plate that divides the fluid mixing and cooling device between the reaction stages of the multi-stage reactor into an upper part and a lower part, and a partition plate arranged above the partition plate. Since it is provided with a perforated plate which holds a liquid reaction fluid, and an inflow pipe which is arranged between these partition plate and the perforated plate and into which a cooling gas flows, a partition plate and a perforated plate are provided. A cooling gas is flown in between, and the reaction fluid is retained in the perforated plate above the cooling gas. Since the porous plate has a plurality of ejection holes for ejecting the cooling gas, the cooling gas passes through these ejection holes, and the cooling gas is ejected into the reaction fluid. A cooling gas contacts the fluid, which cools the reaction fluid and mixes the reaction fluid. Since a plurality of ejection holes are formed in the perforated plate in this way, it is possible to reduce the pressure loss of the cooling gas when the cooling gas passes through the perforated plate and to improve the contact efficiency between the reaction fluid and the cooling gas. Therefore, the heat exchange rate between the reaction fluid and the cooling gas can be improved. Furthermore, the partition plate leaks from the perforated plate.
Use a structure with a drain hole that allows the liquid to flow out.
Therefore, the reaction fluid of the liquid that leaked from the porous plate to the partition plate
Can flow out through the drain hole. For this reason,
Prevents liquid from filling between the perforated plate and the partition plate.
The cooling gas between the perforated plate and the partition plate.
Therefore, the flowability of the cooling gas can be maintained.

Further, the reaction fluid located above the perforated plate and penetrating through the partition plate and the perforated plate is located above the perforated plate, and the reaction fluid is introduced from the side opening near the upper end and discharged to the lower part. One or more overflow tubes with side openings
The position controls the height of the holding tank that cools and mixes the reaction fluid.
The reaction fluid is placed at the side opening position.
The cooling time of the reaction fluid and the jet pressure of the cooling gas
Efficient cooling and mixing through the optimized retention tank
Done. After this, the reaction fluid flows down into the overflow pipe,
This reaction fluid passes through the perforated plate and the partition plate. here,
Since the swirl flow can be generated in the reaction fluid around the overflow pipe, the reaction fluid can be further mixed and the temperature of the reaction fluid can be made uniform. On the other hand, the fluid mixing and cooling device is equipped with a partition plate, a perforated plate, an overflow pipe, an inflow pipe and a drain.
Since the holes are formed, the structure of the fluid mixing and cooling device can be simplified.

According to the fluid mixing and cooling device of the second aspect, the effect of the first aspect can be achieved, and the ejection holes are formed obliquely with respect to the axis orthogonal to the perforated plate. From, the cooling gas is jetted obliquely to the reaction fluid. Therefore, the reaction fluid can be further mixed and the flow path of the cooling gas in the reaction fluid can be lengthened, so that the contact efficiency between the reaction fluid and the cooling gas can be improved, and the temperature of the reaction fluid can be made uniform. Can be promoted.

According to the fluid mixing and cooling device of the third aspect, the effect of the first aspect can be obtained, and the porous plate has a pressure loss of 5 mm or more when ejecting the cooling gas from the ejection holes. Since the configuration is such that the opening area is set, the pressure of the cooling gas flowing into the reaction fluid is increased. Therefore, the flow rate of the cooling gas passing through the perforated plate can be prevented from changing with time, and the cooling gas can be uniformly dispersed in the reaction fluid. Therefore, the cooling gas can be surely caused to flow into the reaction fluid, the reaction fluid can be surely mixed, and the reaction fluid and the cooling gas can be surely brought into contact with each other, so that the reaction fluid can be surely cooled.

According to the fluid mixing and cooling device of the fourth aspect, the effect of the first aspect can be obtained, and the perforated plate has a linear flow velocity of the cooling gas ejected from the ejection holes of 2
Since the opening area is set to 0 m / sec or less, the cooling gas can be finely dispersed in the reaction fluid, and the contact efficiency between the cooling gas and the reaction fluid can be improved. Therefore, the heat conversion efficiency between the cooling gas and the reaction fluid can be improved, and the reaction fluid can be reliably dispersed.

[0045]

[Brief description of drawings]

FIG. 1 is a side sectional view showing a fluid mixing and cooling device of the present invention.

FIG. 2 is a plan view showing the perforated plate of FIG.

FIG. 3 is a side sectional view showing the perforated plate of FIG.

FIG. 4 is a plan view showing a measurement part of a perforated plate in Experimental Example 1.

FIG. 5 is a block diagram showing a relationship between conductivity and elapsed time in Experimental Example 1.

FIG. 6 is a block diagram showing the relationship between the liquid mixing time and the height of the overflow pipe in Experimental Example 2.

FIG. 7 is a plan view of a perforated plate showing another embodiment of FIG.

[Explanation of symbols]

10 Fluid mixing and cooling device 11 multi-stage reactor 12 partition boards 14 Perforated plate 15 Overflow pipe 16 Inflow pipe 17 drain hole 18 ejection holes

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Watanabe 1-14-1 Minamikagesho, Yokohama-shi, Kanagawa JGC Corporation Yokohama Works (56) Reference JP-A-55-75901 (JP, A) Publication 48-20991 (JP, B1) German patent application publication 1808911 (DE, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01J 8/00 B01J 10/00

Claims (4)

(57) [Claims] 1. Arranged between each reaction stage of a multi-stage reactor,
In a fluid mixing and cooling device that mixes and cools a liquid reaction fluid and a cooling gas that cools the reaction fluid, a partition plate that divides the fluid mixing and cooling device into an upper portion and a lower portion, and a partition plate that is arranged in parallel above the partition plate. , A perforated plate for holding a reaction fluid, and a partition plate and a perforated plate penetrating the perforated plate so as to project above the perforated plate, and the reaction fluid positioned above the perforated plate near the upper end portion.
One or a plurality of overflow pipes which are introduced from the side opening and flow out to the lower part, an inflow pipe which is arranged between the partition plate and the perforated plate and into which a cooling gas flows, and the partition plate. Formation
A drain that drains the liquid leaked from the perforated plate
A hole, and the side opening position of the overflow pipe is the reaction fluid.
The height of a retention tank for cooling and mixing is defined, and a plurality of ejection holes for ejecting a cooling gas are formed in the perforated plate. 2. The fluid mixing and cooling device according to claim 1, wherein the ejection holes are formed obliquely with respect to an axis orthogonal to the perforated plate. 3. The fluid mixture cooling according to claim 1, wherein the perforated plate is formed in an opening area in which a pressure loss when the cooling gas is ejected from the ejection hole is set to 5 mm or more of a water column. apparatus. 4. The fluid mixing and cooling device according to claim 1, wherein the perforated plate is formed in an opening area in which the linear velocity of the cooling gas ejected from the ejection holes is set to 20 m / sec or less. .