Novel methylamine reactor

Abstract

The invention relates to the technical field of methylamine synthesis, in particular to a novel methylamine reactor which comprises a shell, an air inlet is formed in the lower end of the shell, an air outlet is formed in the left side of the air inlet, an air inlet assembly is arranged in the shell and comprises an electric furnace center pipe, the lower end of the electric furnace center pipe is connected with the air inlet, a first partition plate is arranged at the upper end of the electric furnace center pipe, and a second partition plate is arranged below the first partition plate. The upper end opening of the electric furnace center pipe is located between the first partition plate and the second partition plate, the upper end and the lower end of the electric furnace center pipe are provided with an upper annular pipe and a lower annular pipe respectively, and the upper end of the upper annular pipe is provided with a plurality of air inlet pipes extending upwards. A heat exchange assembly is arranged on the outer side of the electric furnace center pipe and comprises an inner heat exchange pipe and an outer heat exchange pipe which are located between the upper annular pipe and the lower annular pipe, and an upper end opening of the outer heat exchange pipe is located at the lower end of the second partition plate. By arranging the heat exchange assembly, the raw material gas can absorb reaction heat, so that the reaction temperature can be controlled within a reasonable range, and side reaction caused by too high temperature is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of methylamine synthesis, and in particular to a novel methylamine reactor. Background Art

[0002] Methylamine is an organic compound that is widely used in the pharmaceutical, pesticide, rubber, dye and leather industries. It is also widely used in the national defense industry as a high-efficiency rocket fuel. The methylamine reactor is one of the core equipment in the methylamine production process. Whether the structural design of the methylamine reactor is reasonable directly affects the output, quality and production efficiency of methylamine.

[0003] For example, a Chinese patent application with authorization announcement number CN221287784U discloses an enhanced methylamine reactor, which includes a reaction box, the upper surface of which is provided with mounting holes, the interiors of the two mounting holes are embedded with sleeves, the upper ends of the two sleeves are provided with storage boxes, the interiors of the storage boxes are slidably provided with pistons, one side of the two storage boxes is provided with mounting grooves, the interiors of the two mounting grooves are fixedly embedded with visual glass plates, one side of the two visual glass plates are engraved with scale lines, the interior of the reaction box is fixedly connected with a partition, and the lower surface of the partition is rotatably connected to two connecting pipes; the raw material input ratio is controlled by visualizing the amount of reaction raw materials used to prevent excessive reaction by-products.

[0004] However, the above-mentioned methylamine reactor also has certain defects: the side reactions generated in the production process of methylamine synthesis are not only affected by the raw material ratio, but also by the reaction temperature. The reaction temperature cannot be effectively controlled only by controlling the raw material input amount and ratio. Too high a reaction temperature will lead to the occurrence of side reactions, thereby causing a decrease in methylamine productivity. Summary of the invention

[0005] The invention provides a novel methylamine reactor to solve the technical problem that the reaction temperature in the methylamine synthesis process increases the number of side reactions and thus reduces the methylamine productivity.

[0006] In order to solve the above problems, the present invention provides a novel methylamine reactor adopting the following technical solution: A novel methylamine reactor comprises a shell, wherein the lower end of the shell is provided with an air inlet, and one side of the air inlet is provided with an air outlet, and the side where the air outlet is located is defined as the right side. The shell has an air inlet assembly, which comprises an electric furnace central tube extending up and down, the lower end of the electric furnace central tube is connected to the air inlet, and the upper end of the electric furnace central tube is provided with a horizontally extending partition plate 1, and a horizontally extending partition plate 2 is provided below the partition plate 1, and the upper end of the electric furnace central tube is located between the partition plates 1 and 2, and the outer side of the upper end of the electric furnace central tube is provided with a circumferentially extending upper ring tube, and the upper end of the upper ring tube is provided with a plurality of air inlet pipes extending upward, and the upper end of the air inlet pipe is located between the partition plates 1 and 2; A heat exchange assembly is provided on the outer side of the central tube of the electric furnace, which includes a plurality of inner heat exchange tubes extending downwardly and located on the inner side of the upper ring tube, a lower ring tube extending circumferentially is provided on the outer side of the lower end of the central tube of the electric furnace, the lower end of each inner heat exchange tube is fixedly connected to the inner side of the lower ring tube, and a plurality of outer heat exchange tubes extending upwardly are provided on the outer side of the lower ring tube, the upper port of the outer heat exchange tube is located at the lower end of the partition plate 2, and a catalyst is provided in the shell below the upper port of the outer heat exchange tube.

[0007] Its beneficial effect is that by arranging the upper ring tube, the lower ring tube, the inner heat exchange tube and the outer heat exchange tube, the unreacted raw gas can absorb the excess reaction heat, so that the temperature in the reactor can be controlled within a reasonable range, thereby avoiding side reactions caused by excessively high temperature in the reactor.

[0008] Furthermore, the shell is a capsule-shaped structure extending up and down, the shell includes a cover and a furnace body, the cover is a hemispherical structure located at the upper end of the shell, and the partition plate 1 is fixedly connected to the cover.

[0009] Furthermore, the upper end of the inner heat exchange tube has an elbow bent toward the inner side of the upper ring tube, the lower end of the inner heat exchange tube has an elbow bent toward the inner side of the lower ring tube, and the lower end of the outer heat exchange tube has an elbow bent toward the outer side of the lower ring tube, so that the inner heat exchange tube and the outer heat exchange tube are evenly distributed in the furnace body.

[0010] The beneficial effect is that by arranging elbows at the upper and lower ends of the inner heat exchange tube and below the outer heat exchange tube, the inner heat exchange tube and the outer heat exchange tube are evenly distributed in the furnace body, thereby improving the heat exchange efficiency of the heat exchange tube.

[0011] Furthermore, a fixing collar is provided at the upper end of the air intake pipe and on the outer peripheral surface of the air intake pipe. The fixing collar is connected to the air intake pipe by threads, and the fixing collar is used to fix the upper ring pipe.

[0012] Furthermore, a circumferentially extending support ring seat is provided at the lower end of the central tube of the electric furnace and on the outer peripheral surface of the central tube of the electric furnace, and a support frame for supporting the lower ring tube is provided at the upper end of the support ring seat.

[0013] Furthermore, a conical material baffle plate inclined outward from top to bottom is provided at the lower end of the central tube of the electric furnace and on the outer peripheral surface of the central tube of the electric furnace, and the material baffle plate is used to block the solid catalyst and allow the gas to pass through.

[0014] Furthermore, a discharge port is provided at the lower end of the furnace body and located on the left side of the air inlet, the discharge port is located on the left side of the baffle plate, and the air outlet is located below the baffle plate.

[0015] Furthermore, a plurality of thermometers are provided on the left and right sides of the furnace body to monitor the internal temperature of the furnace body.

[0016] Furthermore, two trapezoidal ear seats for fixing the furnace body are symmetrically provided on the left and right sides of the upper end of the furnace body.

[0017] Furthermore, the upper end of the cover is provided with an electric furnace interface for installing the electric furnace, and temperature measuring tube interfaces for installing the temperature measuring tube are provided on both the left and right sides of the electric furnace interface.

[0018] The beneficial effect is that the temperature measuring tube interface and the thermometer can accurately monitor the internal temperature of the reactor and judge the operating status of the equipment, thereby ensuring that the reaction process is carried out within a suitable temperature range, thereby improving product quality and production efficiency.

[0019] The beneficial effects of a novel methylamine reactor provided by the present invention are: 1. By setting the upper ring tube, the lower ring tube, the inner heat exchange tube and the outer heat exchange tube, the unreacted raw gas can absorb the excess reaction heat, so that the temperature in the reactor can be controlled within a reasonable range, thereby avoiding side reactions caused by excessively high temperature in the reactor.

[0020] 2. By arranging elbows at the upper and lower ends of the inner heat exchange tube and at the bottom of the outer heat exchange tube, the inner heat exchange tube and the outer heat exchange tube are evenly distributed in the furnace body, thereby improving the heat exchange efficiency of the heat exchange tube.

[0021] 3. Setting up the temperature measuring tube interface and thermometer can accurately monitor the internal temperature of the reactor and judge the operating status of the equipment, thereby ensuring that the reaction process is carried out within the appropriate temperature range, thereby improving product quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 A schematic structural diagram of a novel methylamine reactor provided by the present invention; Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0023] Description of reference numerals: 1. Shell; 11. Cover; 12. Furnace body; 13. Ear seat; 14. Thermometer; 15. Temperature measuring tube interface; 16. Electric furnace interface; 17. Air inlet; 18. Air outlet; 19. Discharge port; 2. Air intake assembly; 21. Electric furnace center tube; 22. Partition 1; 23. Partition 2; 24. Air intake pipe; 241. Ring; 3. Heat exchange assembly; 31. Upper ring tube; 32. Inner heat exchange tube; 33. Lower ring tube; 34. Outer heat exchange tube; 35. Elbow; 4. Support frame; 5. Support ring seat; 6. Material baffle plate; 7. Catalyst. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] The main idea of ​​the present invention is to enable the unreacted raw gas to absorb excess reaction heat by arranging the upper ring tube 31, the lower ring tube 33, the inner heat exchange tube 32 and the outer heat exchange tube 34, so that the temperature in the reactor can be controlled within a reasonable range, thereby avoiding side reactions caused by excessively high temperature in the reactor.

[0026] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0027] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0028] Embodiment 1 of a novel methylamine reactor provided by the present invention: like Figure 1 As shown, the reactor includes a shell 1, which is a capsule-shaped structure. The shell 1 includes a furnace body 12. The lower end of the furnace body 12 is provided with an air inlet 17, and one side of the air inlet 17 is provided with an air outlet 18, and the side where the air outlet 18 is located is defined as the right side; the upper end of the furnace body 12 is provided with a hemispherical cover 11, and the furnace body 12 is provided with an air inlet component 2, and the air inlet component 2 is used to input raw gas into the furnace body 12; a heat exchange component 3 is provided in the furnace body 12 and on the outside of the air inlet component 2, and the heat exchange component 3 is used to allow the raw gas to absorb reaction heat to stabilize the reaction temperature.

[0029] The air intake assembly 2 is first introduced below. The air intake assembly 2 includes an electric furnace center tube 21 extending up and down inside the furnace body 12. The lower end of the electric furnace center tube 21 is fixedly connected to the air inlet 17. A horizontally extending partition 22 is provided above the electric furnace center tube 21. The partition 22 is fixed on the cover 11. The lower end of the partition 22 has a horizontally extending partition 23. The partition 23 is fixed on the furnace body 12. The upper end of the electric furnace center tube 21 is located between the partition 22 and the partition 23.

[0030] The air intake assembly 2 also includes a plurality of air intake pipes 24 extending upward and downward. The outer side of the upper end of the central tube 21 of the electric furnace is provided with an upper ring tube 31 extending circumferentially. Each of the air intake pipes 24 is fixedly connected to the upper end of the upper ring tube 31. The upper port of the air intake pipe 24 is located between partition 1 22 and partition 2 23 so that the raw gas can enter the upper ring tube 31 through the air intake pipe 24. A fixing ring 241 is provided at the upper end of the air intake pipe 24 and on the outer peripheral surface of the air intake pipe 24. The fixing ring 241 is connected to the air intake pipe 24 by threads. The fixing ring 241 is used to fix the upper ring tube 31.

[0031] The heat exchange assembly 3 is introduced below. The heat exchange assembly 3 includes a plurality of inner heat exchange tubes 32 extending up and down and located on the inner side of the upper ring tube 31. The outer side of the lower end of the electric furnace central tube 21 is provided with a lower ring tube 33 extending circumferentially. The lower end of each inner heat exchange tube 32 is fixedly connected to the inner side of the lower ring tube 33. The outer side of the lower ring tube 33 is provided with a plurality of outer heat exchange tubes 34 extending upward. The upper end of the outer heat exchange tube 34 is located at the lower end of the partition plate 23. The upper end of the outer heat exchange tube 34 is located below the upper end of the outer heat exchange tube 34 and is located below the upper end of the partition plate 23. A catalyst 7 is provided in the furnace body 12 so that the raw gas enters the furnace body 12 and performs a methylamine synthesis reaction from top to bottom; the upper end of the inner heat exchange tube 32 has an elbow 35 bent toward the inner side of the upward ring tube 31, the lower end of the inner heat exchange tube 32 has an elbow 35 bent toward the inner side of the downward ring tube 33, and the lower end of the outer heat exchange tube 34 has an elbow 35 bent toward the outer side of the downward ring tube 33, so that the inner heat exchange tube 32 and the outer heat exchange tube 34 are evenly distributed in the furnace body 12.

[0032] The lower end of the central tube 21 of the electric furnace and the outer peripheral surface of the central tube 21 of the electric furnace are provided with a circumferentially extending support ring seat 5, and the upper end of the support ring seat 5 is provided with a support frame 4 for supporting the lower ring tube 33; the lower end of the support ring seat 5 and the outer peripheral surface of the central tube 21 of the electric furnace are provided with a conical baffle plate 6 inclined outward from top to bottom, the baffle plate 6 is used to stop the solid catalyst 7 and allow the gas to pass through, the gas outlet 18 is located below the baffle plate 6, the lower end of the furnace body 12 and on the left side of the gas inlet 17 is provided with a discharge port 19, the discharge port 19 is located on the left side of the baffle plate 6, and the discharge port 19 is used to discharge the catalyst 7 in the furnace body 12.

[0033] A plurality of thermometers 14 are provided on the left and right sides of the furnace body 12, and are used to monitor the reaction temperature in the furnace body 12; two trapezoidal ear seats 13 for fixing the furnace body 12 are symmetrically provided on the left and right sides of the upper end of the furnace body 12; an electric furnace interface 16 for installing an electric furnace is provided on the upper end of the cover 11, so that the reactor reaches the initial reaction temperature; temperature measuring tube interfaces 15 for installing temperature measuring tubes are provided on the left and right sides of the electric furnace interface 16, so as to monitor the reaction state in the reactor.

[0034] The working principle of the reactor is as follows: first, under the action of the electric furnace (not shown), the temperature in the reactor reaches the initial temperature that meets the reaction conditions, and then the raw gas is input into the central tube 21 of the electric furnace through the air inlet 17, and moves between the partition 1 22 and the partition 2 23 through the central tube 21 of the electric furnace, and then the raw gas enters the upper ring tube 31 through the air inlet pipe 24 and enters each inner heat exchange tube 32 through the upper ring tube 31. At this time, in the process of the raw gas moving downward, due to the large kinetic reaction driving force of the raw gas in the upper section of the furnace body 12 and the large reaction heat, the raw gas absorbs the excess reaction heat, so that the reaction temperature in the furnace body 12 is stabilized within a certain range. Then the raw gas moves downward to the lower ring tube 33 and enters each external heat exchange tube 34 through the lower ring tube 33. In the process of the raw gas moving upward, due to the small driving force of the reaction kinetics in the lower section and the small reaction heat, the raw gas in the external heat exchange tube 34 can transfer heat to the lower catalyst 7, ensuring that the lower catalyst 7 does not take away too much heat, thereby ensuring the reaction temperature of the lower section of the furnace body 12. Then the raw gas moves to the surface layer of the catalyst 7 at the lower end of the partition 23 through the external heat exchange tube 34, and reacts as fresh raw gas under the action of the catalyst 7, while exchanging heat with the heat exchange tube; the reaction products in the furnace body 12 are output through the outlet pipe.

[0035] The heat exchange effect of the heat exchange component 3 can keep the reaction temperature in the reactor within a certain range. At the same time, the thermometer 14 and the temperature measuring tube (not shown) can monitor the reaction state in the furnace body 12 in real time to prevent the occurrence of side reactions caused by excessive temperature in the furnace body 12.

[0036] Example 2 of a novel methylamine reactor provided by the present invention: The main difference between it and Example 1 is: In Example 1, the ear seat is a trapezoidal structure.

[0037] In this embodiment, the ear seat is a triangular structure.

[0038] Example 3 of a novel methylamine reactor provided by the present invention: The main difference between it and Example 1 is: In Example 1, the baffle plate is a conical structure.

[0039] In this embodiment, the material blocking plate is a rectangular structure.

[0040] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0041] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A novel methylamine reactor comprises a shell, wherein the lower end of the shell has an air inlet, and one side of the air inlet is provided with an air outlet, and the side where the air outlet is located is defined as the right side, and is characterized in that: An air intake assembly is provided in the shell, which includes an electric furnace central tube extending up and down, the lower end of the electric furnace central tube is connected to the air inlet, the upper end is provided with a horizontally extending partition plate 1, and a horizontally extending partition plate 2 is provided below the partition plate 1, the upper end of the electric furnace central tube is located between the partition plates 1 and 2, the outer side of the upper end of the electric furnace central tube is provided with a circumferentially extending upper ring tube, the upper end of the upper ring tube is provided with a plurality of air intake pipes extending upward, and the upper end of the air intake pipe is located between the partition plates 1 and 2; A heat exchange assembly is provided on the outer side of the central tube of the electric furnace, which includes a plurality of inner heat exchange tubes extending downwardly and located on the inner side of the upper ring tube, a lower ring tube extending circumferentially is provided on the outer side of the lower end of the central tube of the electric furnace, the lower end of each inner heat exchange tube is fixedly connected to the inner side of the lower ring tube, and a plurality of outer heat exchange tubes extending upwardly are provided on the outer side of the lower ring tube, the upper port of the outer heat exchange tube is located at the lower end of the partition plate 2, and a catalyst is provided in the shell below the upper port of the outer heat exchange tube.

2. A novel methylamine reactor according to claim 1, characterized in that: The shell is a capsule-shaped structure extending up and down, and the shell comprises a sealing cover and a furnace body. The sealing cover is a hemispherical structure located at the upper end of the shell, and the partition plate 1 is fixedly connected to the sealing cover.

3. A novel methylamine reactor according to claim 2, characterized in that: The upper end of the inner heat exchange tube has an elbow bent toward the inner side of the upper ring tube, the lower end of the inner heat exchange tube has an elbow bent toward the inner side of the lower ring tube, and the lower end of the outer heat exchange tube has an elbow bent toward the outer side of the lower ring tube, so that the inner heat exchange tube and the outer heat exchange tube are evenly distributed in the furnace body.

4. A novel methylamine reactor according to claim 3, characterized in that: A fixing collar is provided at the upper end of the air inlet pipe and on the outer peripheral surface of the air inlet pipe. The fixing collar is connected to the air inlet pipe through threads, and the fixing collar is used to fix the upper ring pipe.

5. A novel methylamine reactor according to claim 4, characterized in that: A circumferentially extending support ring seat is provided at the lower end of the central tube of the electric furnace and on the outer peripheral surface of the central tube of the electric furnace, and a support frame for supporting the lower ring tube is provided at the upper end of the support ring seat.

6. A novel methylamine reactor according to claim 5, characterized in that: A conical material baffle plate inclined outward from top to bottom is provided at the lower end of the central tube of the electric furnace and on the outer peripheral surface of the central tube of the electric furnace. The material baffle plate is used to block the solid catalyst and allow the gas to pass through.

7. A novel methylamine reactor according to claim 6, characterized in that: A discharge port is provided at the lower end of the furnace body and located on the left side of the air inlet. The discharge port is located on the left side of the baffle plate, and the air outlet is located below the baffle plate.

8. A novel methylamine reactor according to claim 7, characterized in that: A plurality of thermometers are arranged on the left and right sides of the furnace body to monitor the internal temperature of the furnace body.

9. A novel methylamine reactor according to claim 8, characterized in that: Two trapezoidal ear seats for fixing the furnace body are symmetrically arranged on the left and right sides of the upper end of the furnace body.

10. A novel methylamine reactor according to claim 9, characterized in that: The upper end of the cover is provided with an electric furnace interface for installing the electric furnace, and temperature measuring tube interfaces for installing the temperature measuring tube are provided on both the left and right sides of the electric furnace interface.

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