CN114471409B - A large-flux double-circulation microchannel reactor - Google Patents

Abstract

The invention discloses a large-flux double-circulation microchannel reactor, which comprises a reaction cylinder body, wherein a top end and a bottom end are respectively arranged at the top end and the bottom end of the reaction cylinder body, the left side and the right side of the reaction cylinder body are both connected with heat exchange tubes, a reaction device is arranged in the reaction cylinder body, the reaction device comprises a bottom plate, a top plate, a plurality of sleeves and a plurality of micro-reaction units, each micro-reaction unit comprises a plurality of micro-reaction cylinders, a feeding vertical tube and a discharging vertical tube, and a micro-reaction structure is arranged in each micro-reaction cylinder. The invention enables the injected reaction liquid to react simultaneously in a large number of micro-reaction structures through the plurality of micro-reaction cylinders arranged in the micro-reaction unit, thereby increasing the micro-reaction efficiency of the reaction liquid and achieving the purpose of large-flux rapid reaction of chemical products. According to the invention, through the two sets of heat exchange systems, the inside and the outside of the sleeve can flow heat exchange media, so that the heat transfer efficiency is increased, the heat generated by the reaction can be timely carried out, and the safety of the reaction is improved.

Description

A large-throughput double-circulation microchannel reactor

technical field

The invention belongs to the technical field of chemical equipment, in particular to a large-throughput double-circulation microchannel reactor.

Background technique

The microchannel reactor is a new type of miniaturized continuous flow pipeline reactor. The microchannel reactor is a reaction device with a specific microreaction structure. The microreaction structure is the core of the microreactor. The microreactor in the reactor The channel structure is fabricated by precision machining techniques, and the feature size is generally between 10 and 1000 microns. When using a microchannel reactor for a chemical reaction, the reaction liquid needs to pass through the pipeline and react in the micro-reaction structure in the pipeline. Since the reaction liquid flows through the pipeline, the micro-reaction structure in the pipeline will affect the reaction liquid. The flow rate will affect the efficiency of the chemical reaction of the reaction liquid in the reactor, resulting in a lower reaction flux of the reaction liquid.

Moreover, when a chemical reaction occurs, it will be accompanied by the release of heat. If the heat is not taken out in time, danger may occur, threatening the safety of experimenters.

Contents of the invention

In order to solve the above technical problems, the present invention provides a large-throughput double-circulation microchannel reactor to achieve the purpose of increasing reaction flux, improving reaction efficiency, taking away reaction heat in time, and improving reaction safety.

To achieve the above object, the technical scheme of the present invention is as follows:

A large-flux double-circulation microchannel reactor comprises a reaction cylinder body, a bottom terminal is installed at the bottom of the reaction cylinder, a top terminal is installed at the top, and a feed pipe is connected to the bottom terminal, so The discharge pipe is connected to the top end; the first heat exchange tube and the second heat exchange tube are respectively connected to the external sides of the reaction cylinder body; a reaction device is installed inside the reaction cylinder body; the reaction device includes A bottom plate, a top plate, and some sleeves fixed between the bottom plate and the top plate, a number of micro-reaction units are arranged in the sleeve; the top plate is fixed on the top of the reaction cylinder body and forms a top sealed cavity with the top end, so The bottom plate is fixed on the bottom of the reaction cylinder body and forms a bottom sealed cavity with the bottom end; the bottom of each sleeve is provided with a sleeve end in the bottom sealed cavity, and the feed pipe is connected to each sleeve end;

A third heat exchange tube extending out of the top end is installed on the top of the top plate, a fourth heat exchange tube extending out of the bottom end is installed at the bottom of the bottom plate, and the third heat exchange tube is installed on the The annular pipe on the top plate and several through pipes connected to the annular pipe communicate with the top of each sleeve, and the fourth heat exchange pipe communicates with each sleeve through the annular pipe installed on the bottom plate and several through pipes connected to the annular pipe. The bottom of the cylinder is connected, the annular pipe passes through the end of the sleeve, and the through pipe is located in the end of the sleeve;

The micro-reaction unit includes several vertically stacked micro-reaction cylinders, and feed vertical pipes and discharge vertical pipes arranged on both sides of the micro-reaction cylinder, and the feed vertical pipe is connected to the feed vertical pipe. Several feed horizontal pipes are connected with each micro-reaction cylinder, and the discharge vertical pipe is connected with each micro-reaction cylinder through several discharge horizontal pipes connected to the discharge vertical pipe; the top of the feed vertical pipe is closed, and the bottom end is closed. Passes through the bottom plate and communicates with the end of the sleeve, the bottom end of the discharge vertical pipe is closed, and the top end passes through the top plate and communicates with the top sealing cavity.

In the above scheme, the upper and lower ends of the micro-reaction cylinder are provided with end plates, and the upper and lower two micro-reaction cylinders are fixedly connected through the end plates, and the upper and lower sides of the side wall of the micro-reaction cylinder are provided with feed ports and discharge ports. The feed port is connected to the feed horizontal pipe, and the discharge port is connected to the discharge horizontal pipe; a pair of fixed rings are arranged between the feed port and the discharge port on the inner wall of the micro-reaction cylinder, two A micro-reaction structure is arranged between the fixed rings.

In a further technical solution, the feed inlet is arranged at the upper part of the side wall of the micro-reaction cylinder, the discharge port is arranged at the lower part of the side wall of the micro-reaction cylinder, and the feed inlet and the discharge port are located opposite to each other.

In a further technical solution, the feed inlet is arranged at the lower part of the side wall of the micro-reaction cylinder, and the discharge port is arranged at the upper part of the side wall of the micro-reaction cylinder, and the position of the feed inlet and the discharge port are opposite to each other.

In the above solution, several partitions are arranged horizontally inside the reaction cylinder, and several spacers are fixed between two adjacent partitions, and sleeve holes are provided on the partitions, and the sleeve is located in the sleeve holes.

In the above scheme, a plurality of first connecting pipes are connected to the outer surfaces of both sides of the reaction cylinder, and the first connecting pipes are located between two adjacent partitions; the first heat exchange pipe and the second Several second connecting pipes are connected to the two heat exchanging pipes, the first connecting pipes are connected to the second connecting pipes, and the middle parts of the first heat exchanging pipes and the second heat exchanging pipes are connected to the convex pipes that enter and exit the heat exchanging medium .

In the above solution, the micro-reaction structure is a multi-layer baffle plate with holes arranged between two fixed rings, and the holes on adjacent baffles are misplaced.

In the above solution, the third heat exchange tube is a heat exchange medium outflow tube, and the fourth heat exchange tube is a heat exchange medium inlet tube.

In a further technical solution, the heat exchange medium is water.

Through the above-mentioned technical scheme, a kind of large-throughput double-circulation microchannel reactor provided by the present invention has the following beneficial effects:

1. In the present invention, through a plurality of micro-reaction cylinders arranged in the sleeve, after the reaction liquid is injected from the feed pipe into the ends of each sleeve, the reaction liquid can enter multiple micro-reaction cylinders simultaneously along the feed vertical pipe The reaction is carried out in the micro-reaction structure, and the reacted material is discharged outward along the discharge vertical pipe, so that the injected reaction liquid can react together in a large number of micro-reaction structures at the same time, thereby increasing the micro-reaction efficiency of the reaction liquid. To achieve the purpose of large-flux and rapid response of chemical products.

2. In the present invention, through the first heat exchange tube and the second heat exchange tube, the heat exchange medium can take away the heat outside the sleeve, and through the third heat exchange tube and the fourth heat exchange tube, The heat exchange medium can take away the heat inside the sleeve. Therefore, the present invention uses two sets of heat exchange systems to enable the flow of the heat exchange medium inside and outside the sleeve to increase the heat transfer efficiency so that the heat generated by the reaction can be It is taken out in time, so that some chemical reactions with large exothermic heat can be carried out, and the safety of the reaction can be improved.

3. In the present invention, the end of the sleeve is provided, and the third heat exchange tube passes the heat exchange medium into the sleeve through the annular pipe and each through pipe. At the same time, each through pipe is located in each end of the sleeve, and the sleeve can be taken away in time. The heat generated by the reaction material in the end of the barrel prevents the reaction of the reaction material in the end of the sleeve, further improving safety.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings that are required in the description of the embodiments or the prior art.

Fig. 1 is the overall structure schematic diagram of the double circulation microchannel reactor of large flux of the present invention;

Fig. 2 is an exploded view of the overall structure of the present invention;

Fig. 3 is the structural diagram of reaction tube body among the present invention;

Fig. 4 is a schematic stacking diagram of separators in the present invention;

Fig. 5 is the explosion diagram of reaction device among the present invention;

Fig. 6 is the structural diagram of micro-reaction unit in the present invention;

Fig. 7 is the sectional view of micro-reaction cylinder in the present invention;

Fig. 8 is a schematic diagram of heat exchange medium circulation in a set of heat exchange system in the present invention;

Fig. 9 is a schematic diagram of heat exchange medium circulation in another heat exchange system of the present invention.

Explanation of reference signs:

1-reaction cylinder body; 11-through cavity; 111-first connecting pipe; 12-bottom end; 121-feed pipe; 122-branch pipeline; 13-top end; 131-outlet pipe; 141-second connecting pipe; 142-convex pipe; 15-baffle; 151-hole; 152-column; -the fourth heat exchange tube; 2-reaction device; 21-bottom plate; 22-top plate; 23-ring pipe; 231-through pipe; 24-sleeve; 241-sleeve end; Micro-reaction cylinder; 2511-cavity; 2512-fixed ring; 2513-micro-reaction structure; 2514-end plate; 2515-inlet; 2516-outlet; ; 252-feed vertical pipe; 253-discharge vertical pipe.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

The present invention provides a kind of large-throughput double-circulation microchannel reactor, as shown in Figure 1 and Figure 2, comprising a reaction cylinder body 1, the bottom end of the reaction cylinder body 1 is equipped with a bottom end 12, and the top end is equipped with a top end The head 13 and the bottom end 12 are connected to the feed pipe 121 , the top end 13 is connected to the discharge pipe 131 , and the reaction device 2 is installed inside the reaction cylinder body 1 .

As shown in FIG. 3 , the inside of the reaction cylinder 1 is provided with a through-cavity 11 which is transparent from the top to the bottom, and a first heat exchange tube 14 and a second heat exchange tube 16 are respectively connected to both sides of the reaction cylinder 1 . A plurality of first connecting pipes 111 are connected to the outer surfaces of both sides of the reaction cylinder body 1, and a plurality of second connecting pipes 141 are connected to the first heat exchange tube 14 and the second heat exchange tube 16. The two connecting pipes 141 are connected, and the middle parts of the first heat exchange pipe 14 and the second heat exchange pipe 16 are both connected to the convex pipe 142 for entering and exiting the heat exchange medium.

As shown in Figure 4, several partitions 15 are arranged horizontally inside the reaction cylinder body 1, and the through cavity 11 inside the reaction cylinder body 1 is divided into several independent compartments, and several partition columns are fixed between two adjacent partition plates 15. 152, the separator 15 is provided with a sleeve hole 151. The first connecting pipes 111 are located between two adjacent partitions 15 , the number of the first connecting pipes 111 is equal to the number of compartments, and the positions correspond to each other so that the heat exchange medium can enter different compartments respectively.

As shown in Figure 5, the reaction device 2 includes a base plate 21, a top plate 22 and several sleeves 24 fixed between the base plate 21 and the top plate 22, the sleeve 24 is located in the sleeve hole 151, and the top of the sleeve 24 is fixed and sealed with the top plate 22 , the bottom of the sleeve 24 is fixedly and airtightly connected with the bottom plate 21 , and a plurality of micro-reaction units 25 are arranged in the sleeve 24 . The top plate 22 is fixed on the top of the reaction cylinder 1 and forms a top sealed cavity with the top end 13 , and the bottom plate 21 is fixed on the bottom of the reaction cylinder 1 and forms a bottom sealed cavity with the bottom end 12 . The bottom of each sleeve 24 is provided with a sleeve end 241 located in the bottom sealed cavity, and the feeding pipe 121 is connected to each sleeve end 241 through the branch pipeline 122 .

The top of the top plate 22 is installed with the third heat exchange tube 17 extending out of the top end 13, the bottom of the bottom plate 21 is installed with the fourth heat exchange tube 18 extending out of the bottom end 12, and the third heat exchange tube 17 is installed on the top plate 22 The annular pipe 23 and several through pipes 231 connected on the annular pipe 23 communicate with the top of each sleeve 24, and the fourth heat exchange pipe 18 passes through the annular pipe 23 installed on the bottom plate 21 and several through pipes connected on the annular pipe 23. The pipe 231 communicates with the bottom of each sleeve 24 , wherein the annular pipe 23 passes through the sleeve end 241 , and the through pipe 231 is located inside the corresponding sleeve end 241 .

In this embodiment, the third heat exchange tube 17 is a heat exchange medium outflow tube, and the fourth heat exchange tube 18 is a heat exchange medium inlet tube.

In another embodiment, the third heat exchange tube 17 is a heat exchange medium inlet tube, and the fourth heat exchange tube 18 is a heat exchange medium outflow tube.

As shown in Figure 6, the micro-reaction unit 25 includes several micro-reaction cylinders 251 that are vertically stacked, and the feed vertical pipe 252 and the discharge vertical pipe 253 that are arranged on both sides of the micro-reaction cylinder 251, the feed vertical pipe 252 passes through Several feed horizontal tubes 2517 connected to the feed vertical pipe 252 are connected with each micro-reaction cylinder 251, and the discharge vertical pipe 253 is connected to each micro-reaction cylinder 251 through some discharge horizontal tubes 2518 connected to the discharge vertical pipe 253. Connection; the top of the feed vertical pipe 252 is closed, the bottom end passes through the bottom plate 21 and communicates with the sleeve end 241, the bottom end of the discharge vertical pipe 253 is closed, the top passes through the top plate 22 and communicates with the top sealing cavity.

As shown in Figure 7, the interior of the micro-reaction cylinder 251 is provided with a cavity 2511, the upper and lower ends of the micro-reaction cylinder 251 are provided with end plates 2514, and the end plates 2514 of the upper and lower two micro-reaction cylinders 251 are fixedly connected by bolts, A plurality of micro-reaction cartridges 251 can be assembled into an integral structure. The upper and lower sides of the side wall of the micro-reaction cylinder 251 are provided with a feed inlet 2515 and a discharge outlet 2516, the feed inlet 2515 is connected to the feed horizontal pipe 2517, and the discharge outlet 2516 is connected to the discharge horizontal pipe 2518; on the inner wall of the micro-reaction cylinder 251 A pair of fixed rings 2512 is arranged between the feeding port 2515 and the feeding port 2516, and a micro-reaction structure 2513 is arranged between the two fixing rings 2512, and the micro-reaction structure 2513 is confined inside the cavity 2511 by the two fixing rings 2512.

In this embodiment, the feed port 2515 is arranged at the upper part of the side wall of the micro-reaction cylinder 251, and the discharge port 2516 is provided at the lower part of the side wall of the micro-reaction cylinder 251, and the position of the feed port 2515 and the discharge port 2516 are oppositely arranged.

In another embodiment, the feed port 2515 is arranged on the lower side wall of the micro-reaction cylinder 251, the discharge port 2516 is arranged on the upper part of the side wall of the micro-reaction cylinder 251, and the feed port 2515 and the discharge port 2516 are positioned oppositely. .

The micro-reaction structure 2513 is a multilayer baffle plate with holes arranged between the two fixing rings 2512 , and the holes on adjacent baffle plates are misplaced. The micro-reaction structure 2513 can also be other helical channel structures and the like.

In an embodiment of the present invention, the heat exchange medium is water.

The operating principle of the microchannel reactor of the present invention is as follows:

When carrying out the reaction, the reaction material enters each sleeve end 241 from the feed pipe 121 through each branch pipeline 122, and the reaction material is passed through the feed horizontal pipe 2517, the feed vertical pipe 252, The feed port 2515 enters the interior of each micro-reaction cylinder 251, and after a micro-reaction occurs in the micro-reaction structure 2513, the material generated by the reaction enters the top sealing cavity through the discharge port 2516 through the discharge horizontal pipe 2518 and the discharge vertical pipe 253, and then Discharge from the discharge pipe 131. Since the chemical reaction of the reaction solution is carried out by multiple micro-reaction cylinders 251 at the same time, the contact area between the reaction solution and the micro-reaction structure 2513 increases, thereby increasing the efficiency of the chemical reaction and achieving the purpose of large-volume and rapid reaction of chemical products.

A large amount of heat will be generated during the reaction of the reaction liquid, and the present invention performs sufficient heat exchange through two sets of heat exchange systems. details as follows:

As shown in Figure 8, water enters the second heat exchange tube 16 from the convex pipe 142, and enters each compartment inside the reaction cylinder body 1 through the second connection pipe 141 and the first connection pipe 111 on one side of the reaction cylinder body 1, After flowing through the gaps of the sleeves 24, absorbing the heat released by the reaction, and then passing through the first connecting pipe 111 and the second connecting pipe 141 on the other side of the reaction cylinder body 1, after being collected by the first heat exchange pipe 14, the convex Tube 142 flows out.

As shown in Figure 9, water enters in each sleeve 24 from the fourth heat exchange tube 18 through the annular pipe 23 on the bottom plate 21, each through pipe 231, flows through the gap of each micro reaction unit 25, and takes away the micro reaction cylinder 251 The released heat is collected into the annular pipe 23 through the through pipes 231 on the top plate 22 , and then flows out through the third heat exchange pipe 17 . At the same time, each through pipe 231 is located inside each sleeve end 241, which can take away the heat generated by the reaction material entering the sleeve end 241, avoiding the reaction of the reaction material in the sleeve end 241, and improving the safety of the equipment . In actual use, the safety of the reaction can be improved by controlling the rate of feeding and discharging.

Through the above two sets of heat exchange systems, the heat exchange medium circulates inside and outside the reaction device 2, so that the heat generated by the reaction can be taken out in time, so as to carry out chemical reactions with large heat release.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. The high-flux double-circulation microchannel reactor is characterized by comprising a reaction cylinder body, wherein the bottom end of the reaction cylinder body is provided with a bottom end head, the top end of the reaction cylinder body is provided with a top end head, the bottom end head is connected with a feed pipe, and the top end head is connected with a discharge pipe; the two sides of the outside of the reaction cylinder body are respectively connected with a first heat exchange tube and a second heat exchange tube; a reaction device is arranged in the reaction cylinder body; the reaction device comprises a bottom plate, a top plate and a plurality of sleeves fixed between the bottom plate and the top plate, wherein a plurality of micro-reaction units are arranged in the sleeves; the top plate is fixed at the top end of the reaction cylinder body and forms a top sealing cavity with the top end, and the bottom plate is fixed at the bottom end of the reaction cylinder body and forms a bottom sealing cavity with the bottom end; the bottom of each sleeve is provided with a sleeve end head positioned in the bottom sealing cavity, and the feed pipe is connected with each sleeve end head through a branch pipe;

the top of the top plate is provided with a third heat exchange tube extending out of the top end, the bottom of the bottom plate is provided with a fourth heat exchange tube extending out of the bottom end, the third heat exchange tube is communicated with the tops of the sleeves through an annular tube arranged on the top plate and a plurality of through tubes connected to the annular tube, the fourth heat exchange tube is communicated with the bottoms of the sleeves through an annular tube arranged on the bottom plate and a plurality of through tubes connected to the annular tube, and the annular tube penetrates through the sleeve end and is positioned in the sleeve end;

the micro-reaction unit comprises a plurality of micro-reaction cylinders vertically stacked, and a feeding vertical pipe and a discharging vertical pipe which are arranged on two sides of the micro-reaction cylinders, wherein the feeding vertical pipe is connected with each micro-reaction cylinder through a plurality of feeding horizontal pipes connected to the feeding vertical pipe, and the discharging vertical pipe is connected with each micro-reaction cylinder through a plurality of discharging horizontal pipes connected to the discharging vertical pipe; the top end of the feeding vertical pipe is closed, the bottom end of the feeding vertical pipe penetrates through the bottom plate and is communicated with the end head of the sleeve, the bottom end of the discharging vertical pipe is closed, and the top end of the discharging vertical pipe penetrates through the top plate and is communicated with the top sealing cavity;

a plurality of partition boards are horizontally arranged in the reaction cylinder body, a plurality of partition columns are fixed between two adjacent partition boards, sleeve holes are formed in the partition boards, and the sleeves are positioned in the sleeve holes; a plurality of first connecting pipes are connected to the outer surfaces of two sides of the reaction cylinder body, and the first connecting pipes are positioned between two adjacent partition boards; the heat exchange device comprises a first heat exchange tube, a second heat exchange tube, a plurality of second connecting tubes, a convex tube, a heat exchange medium inlet and outlet, a heat exchange medium outlet and outlet, and a heat exchange tube.

2. The high-throughput double-circulation microchannel reactor according to claim 1, wherein the upper end and the lower end of the micro-reaction cylinder are respectively provided with an end plate, the upper micro-reaction cylinder and the lower micro-reaction cylinder are fixedly connected through the end plates, the upper side and the lower side of the side wall of the micro-reaction cylinder are provided with a feed inlet and a discharge outlet, the feed inlet is connected with a feed horizontal pipe, and the discharge outlet is connected with a discharge horizontal pipe; a pair of fixed rings are arranged on the inner wall of the micro-reaction cylinder and positioned between the feeding hole and the discharging hole, and a micro-reaction structure is arranged between the two fixed rings.

3. The high throughput double circulation microchannel reactor according to claim 2, wherein the feed inlet is arranged on the upper part of the side wall of the microreaction cylinder, the discharge outlet is arranged on the lower part of the side wall of the microreaction cylinder, and the feed inlet and the discharge outlet are arranged oppositely.

4. The high throughput double circulation microchannel reactor according to claim 2, wherein the feed inlet is arranged at the lower part of the side wall of the microreaction cylinder, the discharge outlet is arranged at the upper part of the side wall of the microreaction cylinder, and the feed inlet and the discharge outlet are arranged oppositely.

5. The high throughput dual cycle microchannel reactor of claim 2, wherein the microreaction structure is a multi-layer perforated baffle plate disposed between two retaining rings, and the holes in adjacent baffle plates are offset.

6. The high-throughput dual-cycle microchannel reactor of claim 1, wherein the third heat exchange tube is a heat exchange medium outflow tube and the fourth heat exchange tube is a heat exchange medium inlet tube.

7. A high throughput dual cycle microchannel reactor according to claim 1 or 6, wherein the heat exchange medium is water.